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A super-large graphite deposit discovered in granite rocks at Huangyangshan, Xinjiang,China 被引量:9
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作者 Jiang Ai Xin-biao Lu +1 位作者 Zuo-wu Li Ya-lun Wu 《China Geology》 2018年第1期164-166,共3页
1.Objective A graphite deposit has been discovered in Sujiquan, Xinjiang in 1980s,which provides detailed geological settings for the super-large graphite deposit discovered in Huangyangshan pluton with total reserves... 1.Objective A graphite deposit has been discovered in Sujiquan, Xinjiang in 1980s,which provides detailed geological settings for the super-large graphite deposit discovered in Huangyangshan pluton with total reserves up to 7.264×10^9 t in 2017.Outcrops of igneous rocks in the study area include Middle Devonian plagioclase granite and Late Carboniferous alkali feldspar granite that is referred to the Huangyangshan pluton,which includes the Lower Carboniferous Heishantou Formation and Jiangbasi Formation,both of which consist of volcanic-sedimentary rocks (Fig.1).Sujiquan fault provided passage for the migration of volcanic intrusions.Graphite deposits are usually hosted by metamorphic rocks,but Huangyanshan deposits are hosted by granite rocks,which are rarely known.The Huangyangshan graphite deposit hosted by granite pluton at Huangyangshan area was discovered by Xinjiang Branch of China National Geological Exploration Center of Building Materials Industry since 2015. 展开更多
关键词 super-large GRAPHITE DEPOSIT GRANITE ROCKS Huangyangshan
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Numerical simulation research on response characteristics of surrounding rock for deep super-large section chamber under dynamic and static combined loading condition 被引量:13
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作者 FAN De-yuan LIU Xue-sheng +3 位作者 TAN Yun-liang SONG Shi-lin NING Jian-guo MA Qing 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第12期3544-3566,共23页
The stability control of surrounding rock for large or super-large section chamber is a difficult technical problem in deep mining condition.Based on the in-site geological conditions of Longgu coal mine,this paper us... The stability control of surrounding rock for large or super-large section chamber is a difficult technical problem in deep mining condition.Based on the in-site geological conditions of Longgu coal mine,this paper used the dynamic module of FLAC3D to study the response characteristics of deep super-large section chamber under dynamic and static combined loading condition.Results showed that under the static loading condition,the maximum vertical stress,deformation and failure range are large,where the stress concentration coefficient is 1.64.The maximum roof-to-floor and two-sides deformations are 54.6 mm and 53.1 mm,respectively.Then,under the dynamic and static combined loading condition:(1)The influence of dynamic load frequency on the two-sides is more obvious;(2)The dynamic load amplitude has the greatest influence on the stress concentration degree,and the plastic failure tends to develop to the deeper;(3)With the dynamic load source distance increase,the response of surrounding rock is gradually attenuated.On this basis,empirical equations for each dynamic load conditions were obtained by using regression analysis method,and all correlation coefficients are greater than 0.99.This research provided reference for the supporting design of deep super-large section chamber under same or similar conditions. 展开更多
关键词 deep mining super-larger section chamber static load dynamic load frequency dynamic load amplitude dynamic load source distance
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Bainiuchang super-large silver-polymetallic ore deposit related to granitic magmatism in Mengzi, Yunnan 被引量:4
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作者 刘继顺 张洪培 +1 位作者 欧阳玉飞 张彩华 《Journal of Central South University of Technology》 EI 2007年第4期568-574,共7页
Bainiuchang silver-polymetallic ore deposit is located in the southeast Yunnan tin-polymetallic metallogenic belt.The probable reserves and inferred resources of the deposit are of 6 470 t Ag and 1.10 Mt Pb and 1.72 M... Bainiuchang silver-polymetallic ore deposit is located in the southeast Yunnan tin-polymetallic metallogenic belt.The probable reserves and inferred resources of the deposit are of 6 470 t Ag and 1.10 Mt Pb and 1.72 Mt Zn and 86 kt Sn.Orebodies of the deposit occur in clastic-carbonate rocks of Tianpeng Formation and Longha Formation of the middle Cambrian System above the Bainiuchang concealed granite of the late Yanshan period.The concealed granite has the characteristics of tin-bearing granites.Abundance of the mineralization elements Sn,Cu,Zn,Pb,Ag and Sb is high in the granitic rocks.Sulphur isotope data of the metal sulphides indicate that most sulphur is derived from the magmas.The ores are similar in rare earth element(REE)patterns to the granitic rocks.The granitic magma activity results in ore-bearing structures.Rocks of the Middle Cambrian System above the concealed intrusion suffer from skarnization,hornfelsing,marbleization,siliconizing and carbonatization.The mineralization elements Sn,Cu,Zn,Pb,Ag and Sb successively appear from the top of the granite to surrounding rocks.These evidences indicate that the granitic magmatism is the principal mineralization factor.The opinion that the south Bainiuchang ore field and the north Awei ore block are tin and copper potential exploration areas was put forward and was verified by drilling tests. 展开更多
关键词 BAINIUCHANG super-large silver-polymetallic deposit granite granitic-porphyry tin ore
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Instability energy mechanism of super-large section crossing chambers in deep coal mines 被引量:3
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作者 Deyuan Fan Xuesheng Liu +2 位作者 Yunliang Tan Xuebin Li Purev Lkhamsuren 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2022年第5期1075-1086,共12页
The stress concentration and failure at chamber intersections in coal mine are intense,especially in deepburied,super-large section conditions.In this paper,the plastic radius of super-large section chamber under uneq... The stress concentration and failure at chamber intersections in coal mine are intense,especially in deepburied,super-large section conditions.In this paper,the plastic radius of super-large section chamber under unequal pressure was corrected on the basis of the size effect.Then,stress and failure evolution of intersections under different crossing angles and equivalent angular bisectors were revealed.Furthermore,2 trajectory curves of failure and stress were analytically expressed,which divided the intersection into 5 influencing zones in the light of stress superposition degree.After determining instability trigger point and instability path,instability energy criterion of intersection can be obtained as K>1,which means that the external energy is greater than the sum of energy consumed by surrounding rock instability and supporting structure failure.Taking coal-gangue separation system of Longgu Coal Mine as example,it was found that there was instability risk under original parameters.For long-term stability,an optimization design method was proposed by considering safety factor,and optimal support scheme was obtained.Field monitoring showed intersections deformations were relatively small with the maximum of 125 mm,which verified the rationality of theoretical analysis.This study provides guidance for the stability control of the intersections under the same or similar conditions. 展开更多
关键词 super-large section INTERSECTION Instability energy mechanism Optimization design Field monitoring
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New Zircon U-Pb Age of the Super-Large Lijiagou Spodumene Deposit in Songpan Garze Fold Belt, Eastern Tibet: Implications for Early Jurassic Rare-Metal Polymetallic Event 被引量:8
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作者 FEI Guangchun TIAN Jingjing +4 位作者 YANG Jiyi GAO Jianguo TANG Wenchun LI Jian GU Chenghui 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2018年第3期1274-1275,共2页
Objective The Songpan-Garze Fold Belt(SGFB),located in the eastern part of the Tibet Plateau and west of the Sichuan Basin,is an important pegmatite province in China.Some famous pegmatite type deposits occur in the S... Objective The Songpan-Garze Fold Belt(SGFB),located in the eastern part of the Tibet Plateau and west of the Sichuan Basin,is an important pegmatite province in China.Some famous pegmatite type deposits occur in the SGFB,including the Xuebaoding,Jiajika,Keeryin rare metal deposits and Danba muscovite deposit(Li Jiankang et al.,2015).The newly discovered super-large Lijiagou 展开更多
关键词 New Zircon U-Pb Age of the super-large Lijiagou Jurassic Rare-Metal Polymetallic Event
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Wind-induced responses of super-large cooling towers 被引量:3
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作者 柯世堂 葛耀君 +2 位作者 赵林 陈少林 Y.Tamura 《Journal of Central South University》 SCIE EI CAS 2013年第11期3216-3228,共13页
Traditional gust load factor(GLF)method,inertial wind load(IWL)method and tri-component method(LRC+IWL)cannot accurately analyze the wind-induced responses of super-large cooling towers,so the real combination formula... Traditional gust load factor(GLF)method,inertial wind load(IWL)method and tri-component method(LRC+IWL)cannot accurately analyze the wind-induced responses of super-large cooling towers,so the real combination formulas of fluctuating wind-induced responses and equivalent static wind loads(ESWLSs)were derived based on structural dynamics and random vibration theory.The consistent coupled method(CCM)was presented to compensate the coupled term between background and resonant response.Taking the super-large cooling tower(H=215 m)of nuclear power plant in Jiangxi Province,China,which is the highest and largest in China,as the example,based on modified equivalent beam-net design method,the aero-elastic model for simultaneous pressure and vibration measurement of super-large cooling tower is firstly carried out.Then,combining wind tunnel test and CCM,the effects of self-excited force on the surface pressures and wind-induced responses are discussed,and the wind-induced response characteristics of background component,resonant component,coupled term between background and resonant response,fluctuating responses,and wind vibration coefficients are discussed.It can be concluded that wind-induced response mechanism must be understood to direct the wind resistant design for super-large cooling towers. 展开更多
关键词 super-large cooling towers wind-induced responses wind vibration coefficients aero-elastic model consistent coupled method
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A Super-Large Rb-Nb Rare Metal Deposit has been Discovered in Huashi Village of Xinglong County, Hebei Province 被引量:2
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作者 LI Yujing XIE Wu +3 位作者 QI Yunfei MIAO Qunfeng XIONG Chao GONG Chuanwei 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第6期2344-2345,共2页
Objective The Huashi Village in Xinglong County of Hebei Province is located in the Yanshan subsidence zone in the central eastern North China Plate, which is 137 km away from Beijing City (Fig. la). This area has ... Objective The Huashi Village in Xinglong County of Hebei Province is located in the Yanshan subsidence zone in the central eastern North China Plate, which is 137 km away from Beijing City (Fig. la). This area has undergone large -scale magmatic intrusion affected by the tectonic compression of the Pacific Plate in the Mesozoic (known as the Yanshanian movement) to form many alkaline rocks such as the Wulingshan rock mass. Previous studies have conducted petrological research and reconnaissance survey of rare metal ores in this area (Tian Shuzhang and Guo Zongshan, 1981; Xu Baoling et al., 1996). In 2016, the Qinhuangdao Mineral and Hydrology Engineering Geological Brigade of Hebei Bureau of Geology and Mineral Resources Exploration implemented the project of Reconnaissance of Rare Metal Ores Including Rubidium in Huashi Village of Xinglong County, Hebei Province, and discovered super-large rare metal deposits of rubidium and biobium in the Madi alkali feldspar granite bodies in the Huashi Village to achieve great breakthrough of rare metal ore prospecting. 展开更多
关键词 A super-large Rb-Nb Rare Metal Deposit Huashi
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Two Super-Large Gold Deposits Have Been Discovered in Jiaodong Peninsula of China 被引量:3
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作者 HAO Ziguo FEI Hongcai +1 位作者 HAO Qingqing LIU Lian 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2016年第1期368-369,共2页
During 2015, gold prospecting in Laizhou City of Shandong Peninsula in China has achieved a major breakthrough. Deposits containing 470 and 389 tons of gold metal were discovered in the northern sea area of Sanshandao... During 2015, gold prospecting in Laizhou City of Shandong Peninsula in China has achieved a major breakthrough. Deposits containing 470 and 389 tons of gold metal were discovered in the northern sea area of Sanshandao and the Shaling area, respectively. As a result, the gold prospective resources in the entire Jiaodong Peninsula have now exceeded 4000 tons, fully indicative of the super-large prospecting potential of the Jiaojia-type deposits. 展开更多
关键词 GOLD Two super-large Gold Deposits Have Been Discovered in Jiaodong Peninsula of China
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Magmatic Evolution and Mineralization Process of the Super-Large Shihuiyao Rb–Nb–Ta Deposit,Southern Great Xing'an Range,China 被引量:3
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作者 ZHOU Zhenhua CHE Hewei +1 位作者 MA Xinghua GAO Xu 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2016年第6期2275-2276,共2页
Rare metal ore reserves are an important strategic resource, and their metallogenic mechanism and mineralization studies have also been received widespread international attention.
关键词 In Nb Magmatic Evolution and Mineralization Process of the super-large Shihuiyao Rb Ta Deposit Southern Great Xing’an Range China
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The Major Ore Clusters of Super-Large Iron Deposits in the World, Present Situation of Iron Resources in China, and Prospect 被引量:2
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作者 ZHAO Yiming FENG Chengyou LI Daxin 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第6期1895-1915,共21页
The metamorphosed sedimentary type of iron deposits(BIF) is the most important type of iron deposits in the world, and super-large iron ore clusters of this type include the Quadrilatero Ferrifero district and Caraj... The metamorphosed sedimentary type of iron deposits(BIF) is the most important type of iron deposits in the world, and super-large iron ore clusters of this type include the Quadrilatero Ferrifero district and Carajas in Brazil, Hamersley in Australia, Kursk in Russia, Central Province of India and Anshan-Benxi in China. Subordinated types of iron deposits are magmatic, volcanic-hosted and sedimentary ones. This paper briefly introduces the geological characteristics of major super-large iron ore clusters in the world. The proven reserves of iron ores in China are relatively abundant, but they are mainly low-grade ores. Moreover, a considerate part of iron ores are difficult to utilize for their difficult ore dressing, deep burial or other reasons. Iron ore deposits are relatively concentrated in 11 metallogenic provinces(belts), such as the Anshan-Benxi, eastern Hebei, Xichang-Central Yunnan Province and middle-lower reaches of Yangtze River. The main minerogenetic epoches vary widely from the Archean to Quaternary, and are mainly the Late Archean to Middle Proterozoic, Variscan, and Yanshanian periods. The main 7 genetic types of iron deposits in China are metamorphosed sedimentary type(BIF), magmatic type, volcanic-hosted type, skarn type, hydrothermal type, sedimentary type and weathered leaching type. The iron-rich ores occur predominantly in the skarn and marine volcanic-hosted iron deposits, locally in the metamorphosed sedimentary type(BIF) as hydrothermal reformation products. The theory of minerogenetic series of mineral deposits and minerogenic models has applied in investigation and prospecting of iron ore deposits. A combination of deep analyses of aeromagnetic anomalies and geomagnetic anomalies, with gravity anomalies are an effective method to seeking large and deep-buried iron deposits. China has a relatively great oresearching potential of iron ores, especially for metamorphosed sedimentary, skarn, and marine volcanic-hosted iron deposits. For the lower guarantee degree of iron and steel industry, China should give a trading and open the foreign mining markets. 展开更多
关键词 major ore clusters of super-large iron deposits present situation of iron ore resources in China genetic type temporal-spatial distribution ore-searching potential
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Application of Tectono Geochemical Study in Deep Concealed Ore Body Exploration--As the Huize Super-Large Lead-Zinc Deposit an exemple 被引量:1
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作者 ZHANG Quan GUO Yuxinyue +1 位作者 PU Chuanjie WANG Feng 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第S1期247-248,共2页
1 Geological Background of Minerlization or Geologic Setting The northeast of Yunnan1 Pb-Zn-Ag-Ge polymetallic ore district is an important part of the southwestern margin of the Yangtze block Sichuan-Yunnan-Guizhou
关键词 Application of Tectono Geochemical Study in Deep Concealed Ore Body Exploration NE As the Huize super-large Lead-Zinc Deposit an exemple MVT
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Source of the Ore-forming Adakitic Porphyry at the Beiya Super-large Au Deposit, Western Yangtze Craton: New Evidence from Zircon U-Pb Ages of the Amphibolite Xenoliths
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作者 LIU Siqi ZHENG Yuanchuan +3 位作者 SHEN Yang HOU Zengqian WANG Lu WANG Zixuan 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2020年第1期208-209,共2页
Objective The Beiya super-large Au-rich porphyry deposit(304 t Au,2.4 g/t Au)is located within the western Yangtze craton,to the southeast of the Sanjiang Tethyan Orogen(Fig.1).The ore-forming porphyry is adakitic,cha... Objective The Beiya super-large Au-rich porphyry deposit(304 t Au,2.4 g/t Au)is located within the western Yangtze craton,to the southeast of the Sanjiang Tethyan Orogen(Fig.1).The ore-forming porphyry is adakitic,characterized by high Sr/Y and La/Yb ratios coupled with low Y and Yb contents,and is generally thought to be derived from partial melting of thickened mafic lower crust.The lower crust underneath the western Yangtze craton is mainly composed of ancient crust with Archean ages,juvenile crust resulting from the Neoproterozoic subduction(740–1000 Ma),and late Permian juvenile crust related to the Emeishan mantle plume.Which lower crustal end-member has played a critical role in genesis of the Beiya ore-forming porphyry can be constrained by zircon U-Pb ages of amphibolite xenoliths hosted in the ore-forming porphyry,because these xenoliths represent direct samples of the source.In this study,we present new zircon U-Pb ages of these amphibolite xenoliths to have insight into the nature of the Beiya adakitic porphyry source. 展开更多
关键词 Western Yangtze Craton New Evidence from Zircon U-Pb Ages of the AMPHIBOLITE XENOLITHS Source of the ORE-FORMING Adakitic PORPHYRY at the Beiya super-large Au DEPOSIT
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Super-Large Pb-Zn Deposits Discovered in Danaopo,Huayuan County,Hunan Province
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作者 HAO Ziguo FEI Hongcai +1 位作者 HAO Qingqing LIU Lian 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2015年第2期672-673,共2页
Geological Brigade 405 of Hunan Provincial Geology and Mineral Exploration and Development Bureau discovered the Danaopo and Yangjiazhai super-large Pb- Zn deposits through 5 years (2009-2014) of exploration in Huay... Geological Brigade 405 of Hunan Provincial Geology and Mineral Exploration and Development Bureau discovered the Danaopo and Yangjiazhai super-large Pb- Zn deposits through 5 years (2009-2014) of exploration in Huayuan County, Hunan Province. These deposits contain 208.4942 million tons of (332+333) class Pb+Zn ores and 4.8746 million tons of metal amounts, of which metal amounts of 333 class zinc are 4.1198 million tons and metal amounts of lead are 0.7548 million tons, associated with useful components of Cd, Ag and Se. In addition, the Limei, Qingshuitang and Yutang Pb-Zn deposits were proven betbre and this region has thus been ranked as a Pb-Zn ore resource base with a hundred-ton scale (Fig. 1). 展开更多
关键词 PB super-large Pb-Zn Deposits Discovered in Danaopo Huayuan County Hunan Province Zn
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Breeding of Super-large-grain Wheat Germplasms
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作者 Zhanliang YANG Xiaoli BAO +2 位作者 Yongshun XU Qiaoxu CHU Fangyun CHU 《Agricultural Biotechnology》 CAS 2022年第5期22-25,33,共5页
[Objectives]This study was conducted to breed high-yielding wheat varieties. [Methods] A new breeding technology of "Artificial mutagenesis to increase genetic differences between parents and to enhance heterosis... [Objectives]This study was conducted to breed high-yielding wheat varieties. [Methods] A new breeding technology of "Artificial mutagenesis to increase genetic differences between parents and to enhance heterosis" was put forward. Longnan 71 a and Longnan 71 a mutants bred by this technology were crossed with other mutants and normal materials. [Results] In the Wudu experimental field of Longnan City, the traits of super-large grain appeared in the obverse and inverse cross with Longnan 71 a as parents. The trait of super-large grain was dominantly inherited. The traits of various combinations in the Fgeneration were segregated. In the Fgeneration, one super-large-grain low-stalk line and other lines with specific traits were selected. In the Fgeneration, two super-large-grain low-stalk large-ear lines were selected. These three super-large-grain low-stalk wheat lines had reduced plant height and good lodging resistance, and possessed two high-yielding characters among the three factors of yield, so they were expected to be further bred into high-yielding wheat varieties. One line with the largest grain length of 10.3 mm was selected in the Fgeneration. After two years of breeding, in 2022, the largest grain length was measured to be 10.6 mm, and the average 1 000-grain weight and the largest 1 000-grain weight were 75.8 and 100 g, respectively. [Conclusions] This study is about the major progress in artificial cultivation of super-large-grain wheat and has considerable practical value. 展开更多
关键词 Artificially induced mutation Malformed mutation Genetic difference HYBRIDIZATION super-large grain
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Super-Large Manganese Deposits Have Been Discovered at Pujue and Taoziping,Songtao County in Guizhou Province
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作者 HAO Ziguo FEI Hongcai +1 位作者 HAO Qingqing LIU Lian 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第1期343-344,共2页
In 2016,the Geological Brigade No.103 of Guizhou Geology and Mineral Exploration and Development Bureau discovered two super-large manganese deposits at Pujue and Taoziping,in Songtao County,Guizhou Province(Fig.1).... In 2016,the Geological Brigade No.103 of Guizhou Geology and Mineral Exploration and Development Bureau discovered two super-large manganese deposits at Pujue and Taoziping,in Songtao County,Guizhou Province(Fig.1).The Pujue manganese deposit has191.59 million tons of proven(332+333)class ore reserves,including 35.54 million tons of 332 class and 展开更多
关键词 super-large Manganese Deposits Have Been Discovered at Pujue and Taoziping Songtao County in Guizhou Province
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The Newly Discovered Super-Large Wulashan-Hademengou Gold Metallogenic Belt in Inner Mongolia,China Has Gold Reserves of Over 100 Tons
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作者 HAO Ziguo FEI Hongcai +1 位作者 HAO Qingqing Susan TURNER 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第4期1332-1333,共2页
The Wulashan-Hademengou gold ore district in Baotou city, Inner Mongolia, is a further newly discovered super-large gold metallogenic belt in northern China. The accumulated proven gold metal amount is 84.46 t, with a... The Wulashan-Hademengou gold ore district in Baotou city, Inner Mongolia, is a further newly discovered super-large gold metallogenic belt in northern China. The accumulated proven gold metal amount is 84.46 t, with an average grade of 3.53 g/t and a gold metal amount of 63.16 t, with an average grade of 3.30 g/t. The potential reserves are over 100 t. 展开更多
关键词 Gold The Newly Discovered super-large Wulashan-Hademengou Gold Metallogenic Belt in Inner Mongolia China Has Gold Reserves of Over 100 Tons
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迈来芯推出第二代Triaxis电机位置传感器
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《世界电子元器件》 2017年第11期45-45,共1页
全球微电子技术公司——迈来芯(Melexis)宣布推出基于其专利Triaxis霍尔磁传感技术的第二代电机位置传感器(解角器)。新一代MLX90380单芯片解决方案可用于测量电机的绝对角度,适用于包括永磁同步电机(PMSM)和无刷直流电机(BLDC)在内的... 全球微电子技术公司——迈来芯(Melexis)宣布推出基于其专利Triaxis霍尔磁传感技术的第二代电机位置传感器(解角器)。新一代MLX90380单芯片解决方案可用于测量电机的绝对角度,适用于包括永磁同步电机(PMSM)和无刷直流电机(BLDC)在内的所有无刷电机。汽车电气化催生了持续增长的相关应用,对此MLX90380提供了理想的解决方案。 展开更多
关键词 位置传感器 triaxis 第二代
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三维隐伏溶洞对临近隧道围岩破坏特征的影响
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作者 林尧 李兵磊 《福州大学学报(自然科学版)》 CAS 北大核心 2024年第4期487-495,共9页
针对贵州紫金部分矿井巷道围岩存在溶洞经常导致地下工程围岩呈现不稳定状态或剧烈破坏现象这一典型工况,利用简化的类岩石试样开展真三轴压缩试验,结合声发射和内窥摄像头监测围岩的变形和次生破坏行为.研究表明:1)溶洞将导致试样z轴... 针对贵州紫金部分矿井巷道围岩存在溶洞经常导致地下工程围岩呈现不稳定状态或剧烈破坏现象这一典型工况,利用简化的类岩石试样开展真三轴压缩试验,结合声发射和内窥摄像头监测围岩的变形和次生破坏行为.研究表明:1)溶洞将导致试样z轴峰值荷载降低约25%,次生破坏的出现时间更早,且主导性破坏更加集中地出现在峰值应力时段. 2)位于隧道右上侧的溶洞导致隧道右侧围岩呈现一种新的板状破坏,即破坏由隧道-溶洞的中间岩柱起始、沿隧道右侧壁表层围岩纵向发展、并最终形成岩块向内移动,该类型破坏的起始位置和岩块厚度与典型板裂破坏明显不同. 3)压缩型应力和剪切破坏在隧道围岩的板裂破坏过程中占据主导地位,且由于三维溶洞位于隧道右上方,其对隧道下方和左侧围岩的影响相对较小. 4)球形溶洞导致其与隧道之间的岩体内出现更为密集的次生拉伸和剪切裂纹,即该区域内岩体破坏程度明显高于其他位置. 展开更多
关键词 隧道围岩 板裂破坏 真三轴加载 预制溶洞 声发射
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Deformation characteristics and instability mechanism of transportation hub under downward traversal conditions of the double-track super-large diameter shield tunnel
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作者 Xiangzhi Gao Aijun Yao 《Geohazard Mechanics》 2024年第2期131-142,共12页
To investigate the deformation characteristics and instability mechanism of the transportation hub underdownward traversal conditions of the double-track super-large diameter shield tunnel, take the example of Beijing... To investigate the deformation characteristics and instability mechanism of the transportation hub underdownward traversal conditions of the double-track super-large diameter shield tunnel, take the example of BeijingEast Sixth Ring Road into the ground reconstruction project. Using the field experimental monitoring method andnumerical simulation method, after verifying the accuracy of the model, this manuscript begins to unfold theanalysis. The results show that, without any deformation prevention and control measures, The basement raft ofthe underground structure of the transportation hub will produce a deformation difference of 18 mm, and thetensile stress is more than 1.43 MPa, the inhomogeneous deformation and structural cracking will lead tostructural instability and groundwater surges, which seriously affects the safe operation of the transportation hubstation. When control measures are taken, the deformation and stress of the base raft slab of the undergroundstructure of the transportation hub are within the prescribed limits, which can ensure the safe operation of thestation. The displacement of the base slab of the underground structure in the horizontal direction of the crosssection is all pointing to the east, and the overall trend is to shift from the first tunnel to the backward tunnel. Thehorizontal displacement of the base slab in the direction of the tunnel axis all points to the beginning of thecrossing, and the displacement of the slab in the vertical direction is distributed as "rising in the middle andsinking in the surroundings". For a two-lane super-large diameter shield tunnel penetrating an undergroundstructure, there are two mechanical effects: unloading rebound and perimeter rock pressure. The above deformation characteristics are the superposition effect produced by the two, and this fine assessment of the deformation of the raft foundation provides a scientific basis for formulating the deformation control countermeasuresof the crossing project. At the same time, it makes up for the blank of the double-track super-large diameter shieldtunnel down through the transportation hub project. 展开更多
关键词 super-large diameter shield Transportation hub Deformation characteristics Mechanical mechanism Downward traverse
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福州长乐国际机场场地动力特性及稳定性研究
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作者 王小桃 程旭日 +3 位作者 冯雨顺 黎章 童晨曦 张升 《岩土工程学报》 EI CAS CSCD 北大核心 2023年第S02期98-103,共6页
场地稳定性判别对于保障机场长期安全稳定服役具有重要意义。以福州长乐机场饱和砂土为研究对象,通过室内动三轴试验,探究其动力性能及影响因素,并采用室内试验和现场剪切波速测试方法对场地的抗液化能力进行了场地稳定性判别。研究结... 场地稳定性判别对于保障机场长期安全稳定服役具有重要意义。以福州长乐机场饱和砂土为研究对象,通过室内动三轴试验,探究其动力性能及影响因素,并采用室内试验和现场剪切波速测试方法对场地的抗液化能力进行了场地稳定性判别。研究结果表明场地砂土的动剪切模量比随围压增大而增大,阻尼比随围压增大而减小,土体动强度随围压增大而增大;两种场地液化判别方法在深度小于8 m具有良好的一致性,验证了室内试验测定现场场地稳定性的可行性。 展开更多
关键词 动三轴 动剪切模量比 阻尼比 液化判别
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