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西安地裂区的岩土工程灾害与治理措施 被引量:4
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作者 于清高 邵生俊 郑万坤 《自然灾害学报》 CSCD 北大核心 2010年第3期45-51,共7页
西安第四纪覆盖层受下伏岩层构造运动、人类工程活动及其它各种自然营力的作用而产生显著的不均匀沉降变形,导致地层出现地裂缝,构成了具有一定地裂缝分布特征、产状与运动特征的地裂区,从而使其中的地基基础与地下工程因地裂缝的发展... 西安第四纪覆盖层受下伏岩层构造运动、人类工程活动及其它各种自然营力的作用而产生显著的不均匀沉降变形,导致地层出现地裂缝,构成了具有一定地裂缝分布特征、产状与运动特征的地裂区,从而使其中的地基基础与地下工程因地裂缝的发展变化而存在特殊的岩土工程破坏,如地基开裂、基础不均匀变形断裂、衬砌结构开裂或失稳、结构局部应力集中的强度破坏,等等。"点"式建筑的避让法和"线型"地下隧道工程的"局部调整地裂缝变形,兼顾主动适应变形和加强、改善支护结构"法是有效的工程治理方法。前者需要合理确定地裂缝上、下盘的安全距离,后者需要相应的防渗技术与结构措施及耐久、准确的监测技术,以便保证建筑或地下结构的安全运行。 展开更多
关键词 地裂区 避让法 主动适应变形法 防渗技术 结构措施 监测技术
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Simulation of Morphological Development of Soil Cracks in Yuanmou Dry-hot Valley Region, Southwest China 被引量:8
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作者 XIONG Donghong YAN Dongchun +4 位作者 LONG Yi LU Xiaoning HAN Jianning HAN Xueqin SHI Liangtao 《Chinese Geographical Science》 SCIE CSCD 2010年第2期112-122,共11页
Soil cracking is an important process influencing water and solutes transport in the Yuanmou Dry-hot Valley region of Southwest China. Studying the morphological development of soil cracks helps to further reveal the ... Soil cracking is an important process influencing water and solutes transport in the Yuanmou Dry-hot Valley region of Southwest China. Studying the morphological development of soil cracks helps to further reveal the close relationship between the soil cracking process and water movement in such semi-arid regions. Here we report regular changes on surface morphology of soil cracks with decreasing water in four different soils (Typ-Ustic Ferrisols,Ver-Ustic Ferrisols,Tru-Ustic Vertisols and Typ-Ustic Vertisols) through simulation experiments. Our results indicate the following: 1) Different soils ultimately have different development degrees of soil cracks,according to their various values of crack area density. Soil cracks in Typ-Ustic Ferrisols can only develop to the feeble degree,while those in the other three soils are capable of developing into the intensive degree,and even into the extremely intensive degree. 2) Soil crack complexity,as expressed by the value of the area-weighted mean of crack fractal dimension (AWMFRAC),is found to continuously decrease as a whole through the whole cracking process in all the studied soils. 3) Soil crack connectivity shows a uniform trend in the studied soils,that is to say,connectivity gradually increases with soil crack development. 展开更多
关键词 soil cracks morphological development simulation experiment Yuanmou Dry-hot Valley region Southwest China
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Surface Morphology of Soil Cracks in Yuanmou Dry-hot Valley Region,Southwest China 被引量:7
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作者 XIONG Donghong LONG Yi +3 位作者 YAN Dongchun LU Xiaoning JI Zhonghua FANG Haidong 《Journal of Mountain Science》 SCIE CSCD 2009年第4期373-379,共7页
Surface morphology of soil cracks is one of the important factors influencing the water evaporation rate in cracked soil in Yuanmou Dry-hot Valley Region,Southwest China. Quantitative study of the complicated surface ... Surface morphology of soil cracks is one of the important factors influencing the water evaporation rate in cracked soil in Yuanmou Dry-hot Valley Region,Southwest China. Quantitative study of the complicated surface morphology of soil cracks is a prerequisite for further studies of soil-cracking mechanisms. The present paper establishes a quantitative indicator system by application of concepts and methods originating from Fractal Geometry and Network Analysis. These indicators can effectively express the complicated features of soil-crack network structure. Furthermore,a series of values related to soil-crack morphology was obtained by image processing on field photos of soil-crack quads,and gradation criteria for the degree of development of soil cracks were determined. Finally,the changes in values of the morphological indicators under different degrees of development were analyzed in detail. Our results indicate that (1) the degree of development of soil cracks can be divided into five grades,i.e.,feeble development,slight development,medium development,intensive development and extremely intensive development; (2) the values of the indicators change predictably with increasing degree of development of soil cracks. The area density (Dc) increases,and both the area-weighted mean ratio of crack area to perimeter (AWMARP),which reflects the intensity of cracking,and the index r,which is related to the connectivity of a soil crack,grow uniformly (albeit with different forms). AWMRAP increases at a geometric rate while r shows logarithm-mic growth,indicating a gradual increase in theconnectivity of a soil crack. Nevertheless,the area-weighted mean of soil-crack fractal dimension (AWMFRAC) shows a decreasing trend,indicating a gradual decline in the complexity of cracks as area density increases. 展开更多
关键词 Soil crack Surface morphology Quantitative indicator Degree of development Southwest China
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Effect analysis of borehole microseismic monitoring technology on shale gas fracturing in western Hubei 被引量:2
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作者 Li Juan Yu Bing-Song +3 位作者 Tian Yu-Kun Kang Hai-Xia Wang Yu-Fang Zhou Hui 《Applied Geophysics》 SCIE CSCD 2020年第5期764-775,902,共13页
Hydraulic fracturing technology is an important means of shale gas development,and microseismic monitoring is the key technology of fracturing effect evaluation.In this study,hydraulic fracturing and microseismic moni... Hydraulic fracturing technology is an important means of shale gas development,and microseismic monitoring is the key technology of fracturing effect evaluation.In this study,hydraulic fracturing and microseismic monitoring were simultaneously conducted in the Eyangye 2HF well(hereinafter referred to as EYY2HF well).The target stratum of this well is the second member of the Doushantuo Formation of the Sinian System,which is the oldest stratum of horizontal shale gas wells in the world.A total of 4341 microseismic fracturing events were identified,and 23 fracturing stages of the well were defined.The fluctuation of the number of events showed a repeating“high-low”pattern,and the average energy of these events showed minimal differences.These findings indicate that the water pressure required for the reconstruction of the EYY2HF well is appropriate.The main body of the fracture network extended from northwest to southeast,consistent with the interpretation of regional geological and seismic data.The stimulated rock volumes showed a linear increase with the increase of the fracturing stage.Some technological measures,such as quick lift displacement,quick lift sand ratio,and pump stop for secondary sand addition,were adopted during fracturing to increase the complexity of the fracture network.Microseismic fracture monitoring of the well achieved expected eff ects and guided real-time fracturing operations and fracturing eff ect evaluation. 展开更多
关键词 microseismic technology borehole monitoring hydraulic fracturing shale gas western Hubei Province
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Research on the 1879 South Wudu M8.0 Earthquake and Its Co-Seismic Fracture
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作者 Hou Kangming Lei Zhongsheng +2 位作者 Wan Fuling Li Limei Xiong Zhen 《Earthquake Research in China》 2006年第1期1-18,共18页
Based on field investigations and indoor systematic research of the 1879 South Wudu M8.0 earthquake conducted in recent years, the magnitude, damage, seismic intensity, co-seismic fracture of the earthquake, as well a... Based on field investigations and indoor systematic research of the 1879 South Wudu M8.0 earthquake conducted in recent years, the magnitude, damage, seismic intensity, co-seismic fracture of the earthquake, as well as its seismogenic tectonics and preparation process, have been studied. The paper summarizes the results of studies on location of the earthquake’s macroscopic epicenter, magnitude and co-seismic fracture, with emphasis on the distribution range, type, extent and mechanism of its co-seismic fractures. The research reveals that, (1) the major part of the meizoseismal area of the South Wudu earthquake is located between Wudu and Wenxian in southern Gansu Province. It extends in a NEE direction, its shape is elliptical with the major axis about 70km long and the minor axis 30km. The macroscopic epicenter is located in the vicinity of Baoziba, in the east of the meizoseismal area; (2) three co-seismic fracture belts developed in the meizoseismal area, scattering northeastwards and converging southwestwards; (3) the major fracture belt extends from Baishuijiang at Hanan on the west, to the the bank areas of Bailongjiang river on the east, such as Gushuizi, Toufang and Daoqizi, etc.; (4) the co-seismic fractures consist of earthquake fissure, scarp, bulge, landslide, barrier lake and so on, among which landslides are the most obvious phenomenon; (5) according to the location, geometry and mechanism of the fracture, it is assumed that the co-seismic fracture zone of the South Wudu earthquake is the product of left-lateral strike-slip, associated with a dip-slip in the Hanan-Daoqizi-Maopola fault zone; (6) based on the size of the co-seismic fracture and the observed amount of displacement of the seismogenic fault of the South Wudu earthquake, the magnitude of this event is estimated to be M8.0. 展开更多
关键词 The South Wudu earthquake Co-seismic fracture zone Seismogenic fault Earthquake landslide
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The spatial distribution characteristics of shallow fissures of a landslide in the Wenchuan earthquake area 被引量:1
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作者 XU Xing-qian 《Journal of Mountain Science》 SCIE CSCD 2016年第9期1544-1557,共14页
Shallow fissures, being the main infiltration paths of fluid on the surface of a slope, played an important role in the whole process of a landslide. However, the spatial distribution characteristics of fissures in th... Shallow fissures, being the main infiltration paths of fluid on the surface of a slope, played an important role in the whole process of a landslide. However, the spatial distribution characteristics of fissures in the slope are difficult to be determined. In this study, we attempted to characterize the variation pattern of slope fissures along depth in the Wenchuan earthquake area in Sichuan Province by combining engineering geological investigation, geomorphologic analysis and geophysical investigation. The geophysical methods that were used in this study include Multichannel Analysis of Surface Wave(MASW), Ground Penetrating Radar(GPR) and Electrical Resistivity Tomography(ERT). The results suggested that geophysical parameters(shear wave velocity, electromagnetic signals attenuation and resistivity) could provide valuable information for the spatial network of shallow fissures. Through the verification by engineering geological survey and geophysical sensitivity analysis, this work highlighted that MASW was the most appropriate technique to delineate the propagation of shallow fissures in a gravel soil slope. 展开更多
关键词 Shallow fissures LANDSLIDE Wenchuanearthquake Geophysical prospecting
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On the treatment of thermal cracks in lining concrete of water conveyance system of Three Gorges Project permanent ship locks
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作者 王从锋 刘德富 +1 位作者 王东东 段亚辉 《Journal of Coal Science & Engineering(China)》 2008年第1期54-57,共4页
A comprehensive investigation was performed for repairing the different types of cracks appearing on the surface or inside the concrete lining at various depths.The mate- rial properties used in grouting and two metho... A comprehensive investigation was performed for repairing the different types of cracks appearing on the surface or inside the concrete lining at various depths.The mate- rial properties used in grouting and two methods for crack repair were discussed in details, and consequently reliable repair measures were proposed and implemented.It is a better choice to adopt the hole-drilling method for the relatively regular crack.The grouting pres- sure should not be too high and it is generally between 0.4~0.6 MPa.For the second time grouting,the pressure maybe increased to 0.8 MPa.Other method is the pasting nozzles method which is more suitable for irregular cracks such as cracks with intensive density and crossing cracks.Its grouting pressure is generally between 0.6~1.0 MPa.The in-situ tests in Three Gorges Project demonstrate favorably the feasibility and applicability of the proposed methods for crack repair within the lining concrete. 展开更多
关键词 thermal cracks lining concrete Three Gorges Project permanent ship locks
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THRUST NAPPE STRUTRUE IN THE JINGGANG MOUNTAIN: CHARACTERISTICS AND SIGNIFICANCE FOR PROSPECTION OF ORE DEPOSITS
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作者 CUI Xuejun, XIA Bin and ZHOU Jibin(Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry & South ChinaSea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, GD 510640, China Jiangxi Institute of Geological Survey, Nanchang, JX 330201, China) 《Geotectonica et Metallogenia》 2003年第1期1-10,共10页
Nappe structure, as was first discovered by the authors during the regional geological survey at the scale of 1:50,000 in The Jinggang Mountain, is mainly comprised of a series of NNE-NE-striking thrust fault zones an... Nappe structure, as was first discovered by the authors during the regional geological survey at the scale of 1:50,000 in The Jinggang Mountain, is mainly comprised of a series of NNE-NE-striking thrust fault zones and thrust sheets among them. Sinian, Cambrian, Ordovician, Devonian, Carboniferous,Triassic, Jurassic and Cretaceous strata are involved in the thrust nappe system. The nappe structure is of the type of duplex structures formed as a result of the earlier stage migration from SE to NW and late stage migration from E to W of sedimentary cover or basement strata. Formation of the nappe structure in the studied area involves two main epochs: Early Yanshanian and Late Yanshanian to Early Himalayan. The mineral deposits and the buried coalfields in the area, especially the latter, are extensively controlled by the nappe structure. 展开更多
关键词 thrust nappe structure Mesozoic inland deformation the Jinggang Mountain.
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Mechanism of formation of sliding ground fissure in loess hilly areas caused by underground mining 被引量:10
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作者 Liu Hui Deng Kazhong +1 位作者 Lei Shaogang Bian Zhengfu 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第4期553-558,共6页
Based on a shallow-buried coal seam covered with thick loose layers in hilly loess areas of western China,we developed a mechanical model for a mining slope with slope stability analysis, and studied the mechanism of ... Based on a shallow-buried coal seam covered with thick loose layers in hilly loess areas of western China,we developed a mechanical model for a mining slope with slope stability analysis, and studied the mechanism of formation and development of a sliding ground fissure by the circular sliding slice method.Moreover, we established a prediction model of a sliding fissure based on a mechanical mechanism,and verified its reliability on face 52,304, an engineering example, situated at Daliuta coal mine of Shendong mining area in western China. The results show that the stress state of a mining slope is changed by its gravity and additional stress from the shallow-buried coal seam and gully terrain. The mining slope is found to be most unstable when the ratio of the down-sliding to anti-sliding force is the maximum, causing local fractures and sliding fissures. The predicted angles for the sliding fissure of face 52,304 on both sides of the slope are found to be 64.2° and 82.4°, which are in agreement with the experimental data. 展开更多
关键词 Loess hilly area Sliding ground fissure Mechanical model Landslide stability Circular sliding Slice method
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Effect of heterogeneity on occurrence of zonal disintegration around deep underground openings 被引量:1
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作者 Jia Peng Zhu Wancheng Zhang Shichao 《International Journal of Mining Science and Technology》 SCIE EI 2014年第6期859-864,共6页
By utilizing the two numerical codes RFPA3 D and FLAC3 D, the effect of heterogeneity on failure mode and failure mechanism of rock around deep underground excavations under tri-axial stress is analyzed. It is found t... By utilizing the two numerical codes RFPA3 D and FLAC3 D, the effect of heterogeneity on failure mode and failure mechanism of rock around deep underground excavations under tri-axial stress is analyzed. It is found that zonal disintegration is a large scale shear-slip failure developed in deep surrounding rock mass under tri-axial stress, which is accompanied by a large amount of tensile failure. The distance between fractures and the number of fractures have a close correlation with the rock mass heterogeneity. With an increase of the homogeneity index of the rock mass, the distances between fractures decrease and the number of fractures increases. For an intact hard rock mass with relative high homogeneity, only failure mode characterized as v-shaped notches can be formed due to the intersection of intensively developed shear bands. None of the zonal disintegration can be formed due to the fact that with increasing homogeneity, the failure mechanism of rock mass is gradually dominated by shear failure rather than tensile failure. 展开更多
关键词 Deep rock mass Heterogeneity Zonal disintegration Failure mode
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Study on Potential Strong Earthquake Risks Around the Mabian Area,Southern Sichuan
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作者 Yi Guixi Wen Xueze +3 位作者 Zhang Zhiwei Long Feng Ruan Xiang Du Fang 《Earthquake Research in China》 2010年第4期478-490,共13页
Based on seismic data from the regional network for the last 34 years, we analyzed the present fault behavior of major fault zones around the Mabian area, southern Sichuan, and identified the risky fault-segments for ... Based on seismic data from the regional network for the last 34 years, we analyzed the present fault behavior of major fault zones around the Mabian area, southern Sichuan, and identified the risky fault-segments for potential future. The method of analysis is a combination of activity background of historical strong earthquakes mainly show ~ ( 1 ) The spatial distribution of b-values strong and large earthquakes in the spatial distribution of b-values with and current seismicity. Our results indicates significant heterogeneity in the studied area, which reflects the spatial difference of cumulative stress levels along various fault zones and segments. (2) Three anomalously low b-value areas with different dimensions were identified along the Mabian-Yanjin fault zone. These anomalies can be asperities under relatively high cumulated stress levels. Two asperities are located in the north of Mabian county, in Lidian town in western Muchuan county, and near Yanjin at the south end of the fault zone. These two areas represent potential large earthquake seismogenic sites around the Mabian area in the near future. Besides them, the third relatively smaller asperity is identified at southern Suijiang, as another potential strong- earthquake source. (3) An asperity along the southwestern segment of the Longquanshan fault zone indicates the site of potential moderate-to-strong earthquakes. (4) The asperity along the segment between Huangmu town in Hanyuan county and Longchi town in Emeishan city on Jinkouhe-Meigu fault has potential for a moderate-strong earthquake. 展开更多
关键词 Spatial distribution of b-values ASPERITIES Mabian area Strong earthquake risk
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Application of Interferometric Spaceborne Synthetic Aperture Radar to Morphotectonic Research in the Bengcuo Area of Tibet
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作者 Ning Shuzheng Ren Jinwei +2 位作者 Shan Xinjian Tao Wei Zhou Dentin 《Earthquake Research in China》 2006年第4期460-468,共9页
Using ELLS-1/2 radar satellite data, we generated a Digital Elevation Model by Interferometric Synthetic Aperture Radar, and the ERS-1/2 DEM that we generated is obviously superior to both the 1/25 ten thousand-scale ... Using ELLS-1/2 radar satellite data, we generated a Digital Elevation Model by Interferometric Synthetic Aperture Radar, and the ERS-1/2 DEM that we generated is obviously superior to both the 1/25 ten thousand-scale DEM of the National Fundamental Geographic Information System of China and the 90-m spatial resolution's SRTM DEM that America published in 2004 when it showed the characteristics of tiny structure relief. By analyzing the relief characteristics of the Bengcuo fault zone based on ERS-1/2 DEM, we find that the relief on the connection location of the Bengcuo and Pengcuo fault zones has complex characteristics. A structure relief that is similar to the Pengcuo fault zone crosses through the Dazi-Dasha fault on the the Bengcuo fault zone, while the Dazi-Dasha fault crosses through a gully at this place. This indicates that the Dazi-Dasha fault has been active at this place recently. At the same time, the Naka-Naduiduo fault is severed by the gully which was cut through by the Dazi-Dasha fault. Therefore, the Naka-Naduiduo fault was formed earlier than the Dazi-Dasha fault. 展开更多
关键词 Interferometric Synthetic Aperture Radar Digital Elevation Model Strike-slipfault Pull-apart basin
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Failure precursor of surrounding rock mass around cross tunnel in high-steep rock slope 被引量:8
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作者 马克 唐春安 +2 位作者 徐奴文 刘峰 徐敬武 《Journal of Central South University》 SCIE EI CAS 2013年第1期207-217,共11页
The stability of the surrounding rock mass around cross tunnel in the right bank slope of Dagangshan hydropower station, in the southwestern China, was analyzed by microseismic monitoring as well as numerical simulati... The stability of the surrounding rock mass around cross tunnel in the right bank slope of Dagangshan hydropower station, in the southwestern China, was analyzed by microseismic monitoring as well as numerical simulations. The realistic failure process analysis code (abbreviated as RFPA3D) was employed to reproduce the initiation, propagation, coalescence and interactions of micro-fractures, the evolution of associated stress fields and acoustic emission (AE) activities during the whole failure processes of the surrounding rock mass around cross tunnel. Combined with microseismic activities by microseismic monitoring on the fight bank slope, the spatial-temporal evolution and the micro-fracture precursor characteristics during the complete process of progressive failure of the surrounding rock mass around cross tunnel were discussed and the energy release law of the surrounding rock mass around the cross tunnel was obtained. The result shows that the precursor characteristic of microfractures occurring in rock mass is an effective approach to early warn catastrophic damage of rock mass around cross tunnel. Moreover, the heterogeneity of rock mass is the source and internal cause of the failure precursor of rock mass. 展开更多
关键词 rock slope cross tunnel microseismic monitoring precursory characteristics HETEROGENEITY
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Shear-wave Splitting in the Crust beneath Shandong and Its Adjacent Area
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作者 Miao Qingjie Liu Xiqiang +3 位作者 Shi Yuyan Qu Junhao Zheng Jianchang Tian Fengdong 《Earthquake Research in China》 CSCD 2016年第4期556-565,共10页
Based on the seismic data of near-field source from the Shandong Digital Seismic Network,this study obtained the shear-wave splitting parameters from multiple stations. The results show that dominant directions of pol... Based on the seismic data of near-field source from the Shandong Digital Seismic Network,this study obtained the shear-wave splitting parameters from multiple stations. The results show that dominant directions of polarizations of fast shear-waves reflect the spatial distribution characteristics of tectonic stress in this area,CHD and LIS stations show 2 dominant directions,and reveals that the crustal seismic anisotropy in the Shandong area is constrained by the regional stress background,local failure and structure. 展开更多
关键词 Shandong area Shear-wave splitting POLARIZATION Seismic anisotropy Tectonic stress
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Microseismic Concentration Zones before and after the February 12,2014 M_S 7.3 Yutian Earthquake and the Possible Indication of an Earthquake Risk Zone
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作者 Hu Chaozhong Chen Dan +2 位作者 Yang Panxin Xiong Renwei Li Zhangjun 《Earthquake Research in China》 CSCD 2015年第2期169-175,共7页
Since 2001, there have occurred in succession the 2001 Kunlun Mountains M S8. 1earthquake,the 2008 Wenchuan M S8. 0 earthquake,the 2010 Yushu M S7. 1 earthquake and the 2012 Lushan M S7. 0 earthquake in the periphery ... Since 2001, there have occurred in succession the 2001 Kunlun Mountains M S8. 1earthquake,the 2008 Wenchuan M S8. 0 earthquake,the 2010 Yushu M S7. 1 earthquake and the 2012 Lushan M S7. 0 earthquake in the periphery of the Bayan Har block. By comparison of the characteristics of seismic strain release variations before and after the Kunlun Mountains M S8. 1 earthquake in the same time length in the geodynamical related regions,we found that the seismic strain release was obviously enhanced after the earthquake in the Longmenshan area,Batang area,and the NS-trending valleys at the west of the Hot Spring Basin. The Wenchuan earthquake occurred in the first area,and the Yushu earthquake is related to the second area. After the earthquake rupture occurred on the East Kunlun fault zone on the northern boundary of the Bayan Har Block,crustal materials on the south side of the fault zone migrated to the southeast,leading to a concentration of tectonic deformation in the Longmenshan thrust belt, e ventually rupturing on the Longmenshan thrust belt. This earthquake case illustrates that seismicity enhancement zones are possibly prone to long-term destructive earthquakes. After the M S7. 3 earthquake in Yutian,Xinjiang on February 12,2014,earthquake frequency and seismic strain release markedly increased in the junction area between the eastern Qilian Mountain tectonic belt and the Altun Tagh fault zone,where more attention should be paid to the long-term seismic risk. 展开更多
关键词 Seismic risk zone Seismic strain release Yutian Ms7. 3 earthquake
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Study on mechanism of circumferential cracks in cold-region tunnels 被引量:2
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作者 ZHOU Lincong ZHENG Yifeng LI Zhong 《Global Geology》 2010年第2期75-78,共4页
There exists frost damage in cold-region tunnels. The circumferential cracks affect the function of tunnels. Using three-dimensional finite element method, the authors analyzed the mechanism of circumferential cracks ... There exists frost damage in cold-region tunnels. The circumferential cracks affect the function of tunnels. Using three-dimensional finite element method, the authors analyzed the mechanism of circumferential cracks in cold-region tunnels It is proved that the internal thermal stress in lining exceeds the tensile strength of concrete, which is the direct cause for circumferential cracks occurring. The laws of thermal stress in lining induced by parameters such as temperature drop, horizontal drag coefficient and length of lining are analyzed. The conclusions are valuable to the design and construction of cold-region tunnels considering the thermal stress. 展开更多
关键词 TUNNEL cold region circumferential crack temperature stress
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Discussion on the Abnormally Low Active Fault Slip Rate of the M_S 8. 0 Wenchuan Earthquake
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作者 Fu Zhengxiang LU Xiaojian +3 位作者 Jin Xueshen Dai Yinghua Shao Huicheng Hao Ping 《Earthquake Research in China》 2010年第3期272-280,共9页
Based on the collection of active fault slip rate data of large intra-continental shallow thrust earthquakes occurring in the triangular seismic region of the East Asia continent,a preliminary analysis has been perfor... Based on the collection of active fault slip rate data of large intra-continental shallow thrust earthquakes occurring in the triangular seismic region of the East Asia continent,a preliminary analysis has been performed with results showing that the Wenchuan,Sichuan, China earthquake ( MS = 8.0) of May 12,2008 occurred on the Longmenshan Mountain active fault with an abnormally low slip rate. 展开更多
关键词 Ms8.0 Wenchuan earthquake Fault slip rates Longmenshan fault zone Thetriangular region of the East Asia continent
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Estimation of main rheological parameters for Pangxidong-Jinkeng structural fracture zone and Qinzhou-Hangzhou metallogenetic belt in South China
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作者 HE Junguo 《Global Geology》 2013年第3期121-129,共9页
The mylonites occurred in the fracture zones are studied by dynamically recrystallized quartz grains.The natural microstructures in mylonites are simulated and the deformation conditions of mylonitization are estimate... The mylonites occurred in the fracture zones are studied by dynamically recrystallized quartz grains.The natural microstructures in mylonites are simulated and the deformation conditions of mylonitization are estimated by fractal analysis,recrystallized grain size paleopiezometer and flow laws of quartzite.Depending on fractal analysis,the deformation temperature of mylonitization is approximately 600℃,which presents high greenschist facies to low amphibolite facies.The mylonitization occurred at differential stresses of 9.1--10.7MPa(lower limits).Compared with extrapolation of quartzite flow laws and estimates of fractal analysis,the strain rate of mylonitization is under 10-13.8/s. 展开更多
关键词 recrystallized quartz grains MYLONITE fractal analysis deformation condition Pangxidong-Jinkeng structural fracture zone
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A Statistical Analysis on the Wenchuan Aftershock Activity Triggered by Earth Tide 被引量:2
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作者 Li Jin Jiang Haikun 《Earthquake Research in China》 2013年第1期23-38,共16页
A statistical analysis on the Wenchuan aftershock activity triggered by tidal forces is systematically studied based on Schusters test, including earthquakes triggered by tidal force, tidal stress and tidal coulomb fa... A statistical analysis on the Wenchuan aftershock activity triggered by tidal forces is systematically studied based on Schusters test, including earthquakes triggered by tidal force, tidal stress and tidal coulomb failure stress. The results show that a group of strong aftershocks which occurred at the end of July to early August in 2008 at the north of Wenchuan were obviously triggered by earth tide, the same conclusion is drawn by Schusters smooth test of the tidal force, tidal stress and tidal coulomb failure stress. In addition, the Wenchuan aftershock activity is obviously triggered by fortnight tide. In the north, the aftershocks happened more frequently in the first and last quarters of the moon, and in the south, the aftershocks happened more frequently in the first and last quarters of the moon and during the full moon. 展开更多
关键词 Wenchuan aftershocks Tidal triggering Schuster's test
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Engineering Geological Assessment for Route Selection of Railway Line in Geologically Active Area:A Case Study in China 被引量:1
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作者 HUANG Run-qiu LI Yan-rong +1 位作者 QU Ke WANG Ke 《Journal of Mountain Science》 SCIE CSCD 2013年第4期495-508,共14页
The Cheng-Lan railway links Chengdu, a central city in Southwestern China, and Lanzhou, a central city in Northwestern China. The railway passes through the Longmenshan fault zone (Wenchuan earthquake happened there o... The Cheng-Lan railway links Chengdu, a central city in Southwestern China, and Lanzhou, a central city in Northwestern China. The railway passes through the Longmenshan fault zone (Wenchuan earthquake happened there on May 12, 2008), Minjiang fault zone, and Dongkunlun fault zone, which are all active. It runs over the Yangtze River and the Yellow River, and crosses high mountains and deep valleys. There exists, along the railway's alignment, different kinds of strata of hard granite and soft, weak metamorphic rocks such as carbonaceous slate, schist, and phyllite. It is, therefore, a key issue for such an infrastructure construction to assess the engineering geological conditions and risks, so as to mitigate or avoid possible georisks and to offer optional designs. Geological survey and georisk assessment along the railway corridor are carried out. Special attention is given to active faults, earthquakes and seismic zones. Based on these, discussions about geological aspects for route selection of the railway are conducted and countermeasures for georisk control are proposed accordingly. Main conclusions are achieved as follows: (1) Geohazards such as landslides, rockfalls and debries flows dominate both the route selection of the railway and the engineering structures (e.g., tunnels or bridges) adopted; (2) Tunnel has been proved to be an excellent structure for linear engineering in geologically active area; and (3) In the case where avoiding is impractical, necessary protection measures should be taken to engineering slopes in high earthquake intensity areas, especially the area with earthquake of Ms. 8 or greater. 展开更多
关键词 Railway route selection Geologicallyactive area EARTHQUAKE Active fault
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