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Factors Predisposing and Triggering the Phenomenon of Shrinkage-Swelling of Clay Soils in the Urban Center of Diamniadio
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作者 Khadim Faye Fatou Samb +1 位作者 Pape Sanou Faye Yves Berthaud 《Geomaterials》 CAS 2023年第2期23-34,共12页
The phenomena of shrinkage and swelling of clay induce damage to housing structures every year. Precipitation, climatic changes and drought are the cause of wall cracks due to subsidence or swelling of the supporting ... The phenomena of shrinkage and swelling of clay induce damage to housing structures every year. Precipitation, climatic changes and drought are the cause of wall cracks due to subsidence or swelling of the supporting soil. This movement alters the balance between the soil and the structures. To explain this defection, the soil is made up of three elements: the solid, the liquid and the gas. Sometimes in a natural way or following a human intervention, one of these elements undergoes an abnormal variation that causes the loss of the balance between land and works. It is in this sense that this article deals on the one hand with the factors of predisposition and triggering of the phenomena of shrinkage-swelling of the clay soils of Diamniadio and on the other hand, the factors of aggravation linked to the lithological heterogeneity and the variation in the thickness of the layers susceptible to shrinkage-swelling. The studies carried out have enabled a deeper understanding of the behavior of expansive soils following their interactions with climate, vegetation, hydrology, hydrogeology, constructions among others, but also the influence of lateral and vertical variations of fine soil facies. 展开更多
关键词 Swelling Clays Expansive soil shrinkage-Swelling Desiccation Cracks Diamniadio
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Salinity effects on soil shrinkage characteristic curves of fine-grained geomaterials 被引量:3
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作者 Partha Narayan Mishra Alexander Scheuermann +1 位作者 Thierry Bore Ling Li 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2019年第1期181-191,共11页
Fine-grained clayey soils are prone to substantial volume changes during desiccation in response to the dynamics of their moisture regime,and are of critical importance in several geotechnical and geoenvironmental eng... Fine-grained clayey soils are prone to substantial volume changes during desiccation in response to the dynamics of their moisture regime,and are of critical importance in several geotechnical and geoenvironmental engineering applications. As such, the complex interactions between the fraction of soil solids and the ionic pore fluid play a critical role in governing such volume changes, and have been the focus in studies dealing with marine geotechnology, mine-tailing ponds, engineered barrier systems, etc.With this in mind, the present investigation evaluates the volume changes and accompanying densification from a saturated slurry state to a constant volume state of a reference fine-grained geomaterial,kaolin, subjected to evaporative dewatering. For this purpose, several parametric studies involving determination of soil shrinkage characteristic curves(SSCCs) of kaolin under the influence of varied salt constituents and concentrations of pore fluid are performed. Furthermore, a critical assessment of SSCCs depicting progressive shrinkage and volume change behaviour of geomaterials is provided, followed by the analysis of experimentally obtained SSCCs of the kaolin to explore the impacts of pore fluid salinity.Moreover, the SSCCs are parameterised with a predictive model and the fitting parameters are used to quantitatively demonstrate the salinity-dependent volume change response of a representative finegrained porous system. 展开更多
关键词 KAOLIN PORE fluid SALINITY soil shrinkage curves PORE space dynamics GEOTECHNICAL engineering
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Intermittent swelling and shrinkage of a highly expansive soil treated with polyacrylamide 被引量:4
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作者 Amin Soltani An Deng +1 位作者 Abbas Taheri Brendan C.O’Kelly 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2022年第1期252-261,共10页
This laboratory study examines the potential use of an anionic polyacrylamide(PAM)-based material as an environmentally sustainable additive for the stabilization of an expansive soil from South Australia.The experime... This laboratory study examines the potential use of an anionic polyacrylamide(PAM)-based material as an environmentally sustainable additive for the stabilization of an expansive soil from South Australia.The experimental program consisted of consistency limits,sediment volume,compaction and oedometer cyclic swell-shrink tests,performed using distilled water and four different PAM-to-water solutions of P_(D)=0.1 g/L,0.2 g/L,0.4 g/L and 0.6 g/L as the mixing liquids.Overall,the relative swelling and shrinkage strains were found to decrease with increasing number of applied swell-shrink cycles,with an‘elastic equilibrium’condition achieved on the conclusion of four cycles.The propensity for swelling/shrinkage potential reduction(for any given cycle)was found to be in favor of increasing the PAM dosage up to P_(D)=0.2 g/L,beyond which the excess PAM molecules self-associate as aggregates,thereby functioning as a lubricant instead of a flocculant;this critical dosage was termed‘maximum flocculation dosage’(MFD).The MFD assertion was discussed and validated using the consistency limits and sediment volume properties,both exhibiting only marginal variations beyond the identified MFD of P_(D)=0.2 g/L.The accumulated axial strain progressively transitioned from‘expansive’for the unamended soil to an ideal‘neutral’state at the MFD,while higher dosages demonstrated undesirable‘contractive’states. 展开更多
关键词 Expansive soil Polyacrylamide(PAM) Consistency limits Sediment volume Swell-shrink cycles Swelling and shrinkage strains Accumulated axial strain
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Effects of soil shrinkage in permanent gullies formation: The case of Benggang erosion in the granite area of southern China 被引量:1
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作者 HUANG Wan-xia DENG Yu-song +1 位作者 CAI Chong-fa JIANG Dai-hua 《Journal of Mountain Science》 SCIE CSCD 2021年第9期2328-2344,共17页
Soil shrinkage is an important factor in slope destabilization in granitic areas, which is also one of the most important conditions for the formation of permanent gullies. This study explored the effect of soil shrin... Soil shrinkage is an important factor in slope destabilization in granitic areas, which is also one of the most important conditions for the formation of permanent gullies. This study explored the effect of soil shrinkage on permanent gullies, and Benggang erosion in granitic areas in southeastern China was used as an example. Three types of Benggang in granitic area were selected to examine the soil shrinkage of three soil layers(the lateritic, transitional and sandy layers) and their effect on the development of Benggang erosion was studied. The results show that the maximum values of COLEH and COLEV(coefficient of linear extensibility in horizontal and vertical directions, respectively) are 3.09% and 1.60% in the laterite layers, 2.71% and 2.13% in transition layers, and 1.10% and 1.82% in sandy layers, indicating that the shrinkage potential of the soil layers exhibits the following order, from highest to lowest: the laterite layer, transition layer, and sandy layer. With a decreasing volumetric water content, the linear shrinkage ratio increases gradually and eventually stabilizes, and in the laterite, transition and sandy layers, the average values of the maximum linear shrinkage are 1.50%, 2.09%, and 1.74%, respectively. Axial shrinkage is most obvious in the transition layers, in which the volume change in the form of subsidence is greater than that in other layers. The soil shrinkage curves fit the trilinear model(R2>0.9), and the soil shrinkage characteristic curves were divided into structural, basic, and residual sections. The correlation analysis shows that the soil shrinkage rate is positively correlated with clay and Fe2 O3 content and negatively correlated with sand content. Clay and sand contents are the most important factors influencing soil shrinkage. Soil oxides can influence soil shrinkage by affecting the particle composition of the soil, so soil shrinkage is closely related to soil clay minerals. Our findings can provide a theoretical basis for revealing the mechanism of Benggang erosion and its control. 展开更多
关键词 soil shrinkage Permanent gully GRANITE Benggang soil layers
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A New Shrinkage Curve Model, Applied to Moroccan Clayey Soil
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作者 Saad Bensallam Lahcen Bahi +1 位作者 Houssine Ejjaaouani Vladimir Shakhirev 《International Journal of Geosciences》 2012年第3期507-514,共8页
On the basis of the existing relation between the soil’s water content and its structural evolution, we elaborate a new analytical model allowing the analysis of the soil’s shrinkage curve according to the limits of... On the basis of the existing relation between the soil’s water content and its structural evolution, we elaborate a new analytical model allowing the analysis of the soil’s shrinkage curve according to the limits of its hydro-structural boundaries. This model was conducted on undisturbed clayey soil at Moulel-Bergui, Morocco. 展开更多
关键词 Clayey soil Expansive soil shrinkage CURVE ANALYTICAL Model
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Pore shrinkage capacity of Shajiang black soils(Vertisols)on the North China Plain and its influencing factors
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作者 Yueming CHEN Zhongbin ZHANG +4 位作者 Lei GAO Zichun GUO Peng XIONG Fahui JIANG Xinhua PENG 《Pedosphere》 SCIE CAS CSCD 2024年第3期620-630,共11页
Different pore sizes present different pore shrinkage capacities in a nonrigid soil.However,the shrinkage capacities of different pore sizes and their influencing factors are not clear.We aimed to quantify the shrinka... Different pore sizes present different pore shrinkage capacities in a nonrigid soil.However,the shrinkage capacities of different pore sizes and their influencing factors are not clear.We aimed to quantify the shrinkage capacities of different pore sizes(large pores,>50μm;medium pores,0.2-50μm;fine pores,<0.2μm)and determine how soil properties impact soil shrinkage capacity at the regional scale.Two sampling transects from west to east(360 km long,35 samples)and from north to south(190 km long,29 samples)were selected to investigate soil shrinkage capacity and physicochemical properties of at0-20 cm depth in the Vertisol(locally known as Shajiang black soil)region of the North China Plain.The results showed that soil total shrinkage capacity,indicated by the coefficient of linear extensibility(COLE),had a mean value of 0.041-0.051 in the west-east and north-south transects.Large pores had higher pore shrinkage index(PSI)values(0.103-0.109)than medium(0.077-0.096)and fine(0.087-0.091)pores.The PSI of fine pores showed a fluctuating increasing trend from northwest to southeast,and the fine pore shrinkage capacity determined the COLE(r^(2)=0.789,P<0.001).The PSI of large pores had a significant relationship with soil bulk density(r=0.281,P<0.05)and organic carbon(r=-0.311,P<0.05),whereas those of medium and fine pores were correlated with soil clay content(r=0.381 and 0.687,respectively,P<0.001).In addition,the PSI of fine pores was also correlated with montmorillonite content(r=0.387,P<0.01).It can be concluded that the PSI of large pores is related to anthropogenically influenced soil properties with low stability,whereas those of medium and fine pores are related to pedogenic properties.The high variability in anthropogenic and pedogenic factors explains the spatial pattern of Vertisol shrinkage capacity on the North China Plain. 展开更多
关键词 clay content coefficient of linear extensibility pore shrinkage index soil structure spatial distribution SWELLING
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Influences of Reinforcement on Differential Drying Shrinkage of Concrete 被引量:1
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作者 高小建 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2012年第3期576-580,共5页
Shrinkage strain of concrete specimen with different reinforcement configuration was measured at various depths from the exposed surface by using several pairs of displacement sensors. Only one surface of the concrete... Shrinkage strain of concrete specimen with different reinforcement configuration was measured at various depths from the exposed surface by using several pairs of displacement sensors. Only one surface of the concrete specimen was exposed to dry condition during the experiment. The results show that differential shrinkage strain occurs in both plain and steel reinforced concrete specimens according to depths from the exposed surface. A higher reinforcement ratio results in a greater restraint against shrinkage of concrete nearby reinforcement rebar and a worse differential shrinkage strain distribution in the concrete specimen. The restraint against shrinkage of concrete becomes lower with the increasing distance from reinforcement rebar. Under the same reinforcement arrangement, a higher free shrinkage of concrete leads to a stronger restraint against shrinkage and a higher shrinkage stress formation in local concrete. The relationship between shrinkage strain and reduction of relative humidity in reinforced concrete structure is far different from that in plain concrete. 展开更多
关键词 CONCRETE REINFORCEMENT non-uniform drying shrinkage strain distribution internal restraint
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Experimental study of the effects of non-uniformly distributed fine soil on mechanical properties of Shenyang–Dandong Railway coarse-grained soil
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作者 QianMi Yu JianKun Liu +2 位作者 JingYu Liu DingJun Lv TengFei Wang 《Research in Cold and Arid Regions》 CSCD 2015年第5期503-512,共10页
The stress produced by repeated train loads decreases with increasing railway subgrade bed depth, and slightly weathered coarse particles of subgrade bed fillings can be broken at different levels under continuous loa... The stress produced by repeated train loads decreases with increasing railway subgrade bed depth, and slightly weathered coarse particles of subgrade bed fillings can be broken at different levels under continuous load. Thus, the mass of fine soil, with a diameter of not more than 0.075 mm, is different at different depths. Fine soil is also sensitive to frost heave and thaw settlement. In order to study the effects of non-uniformly distributed fine soil on the mechanical properties of coarse-grained soil of the Shenyang-Dandong Railway, triaxial tests were conducted with three types of specimens, un- dergoing six freeze-thaw cycle numbers (0, 1, 3, 7, 9, 12) and three confining pressures (100, 200, 300 kPa). The freezing temperature is -5 ~C and the thawing temperature is +15 ~C. The stress-strain behavior, static strength, resilient modulus, cohesive force and the angle of internal friction were measured for different tested specimens. As a result, the law of static strength and resilient modulus of different specimens following the increase of freeze-thaw cycles under three confining pressures is obtained. The changing law of cohesive force and friction angle of three specimens following the increase of freeze-thaw cycles is also calculated, and the different results of different specimens are also compared. 展开更多
关键词 fine soil non-uniform distribution freeze-thaw cycles soil mechanical properties
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物理化学效应对膨胀土收缩特性的影响机制 被引量:1
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作者 马田田 于海文 +2 位作者 韦昌富 伊盼盼 姚传芹 《岩土力学》 EI CAS CSCD 北大核心 2024年第3期697-704,共8页
膨胀土由于其骨架带有较多的固定负电荷,层间存在与负电荷平衡的可交换阳离子,使得土体呈现较强的胀缩性。研究结果表明,膨胀土的胀缩性会受到孔隙溶液化学成分的影响。选用广西地区的强膨胀土作为研究对象,开展了不同浓度的NaCl溶液对... 膨胀土由于其骨架带有较多的固定负电荷,层间存在与负电荷平衡的可交换阳离子,使得土体呈现较强的胀缩性。研究结果表明,膨胀土的胀缩性会受到孔隙溶液化学成分的影响。选用广西地区的强膨胀土作为研究对象,开展了不同浓度的NaCl溶液对膨胀土土-水特征曲线和收缩曲线影响的试验研究,引入了粒间应力的概念对收缩曲线进行描述,该粒间应力考虑了渗透、毛细和吸附的影响。结果表明:孔隙盐溶液是通过渗透吸力对土-水特征曲线产生影响,对基质吸力的影响较小。土样在脱湿过程中的收缩变形是由粒间应力来控制的,类似于加压固结现象。大部分的收缩都发生在毛细阶段,为弹塑性变形;吸附阶段的收缩较少,为弹性变形。通过识别压缩曲线上的弹塑性分界点可以得出毛细和吸附作用的分界点,该分界点与独立测量的不同密实度下的持水曲线结果一致。结果表明,粒间应力能够更好地描述膨胀土的化学-力学行为,特别是在低含水率条件下。 展开更多
关键词 膨胀土 土-水特征曲线 收缩曲线 孔隙盐溶液 粒间应力
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干湿循环对机制砂改良膨胀土力学与变形特性影响
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作者 肖桂元 方玉凯 《兰州工业学院学报》 2024年第3期13-19,共7页
在膨胀土中加入不同掺量的机制砂进行物理改良,对土样开展0~5次的干湿循环试验以分析土样的裂隙发育规律,并将干湿循环1、3、5次后的土样进行直接剪切试验及收缩和膨胀试验,探究经过干湿循环后土样的强度衰减和收缩膨胀特性。结果表明:... 在膨胀土中加入不同掺量的机制砂进行物理改良,对土样开展0~5次的干湿循环试验以分析土样的裂隙发育规律,并将干湿循环1、3、5次后的土样进行直接剪切试验及收缩和膨胀试验,探究经过干湿循环后土样的强度衰减和收缩膨胀特性。结果表明:机制砂可有效抑制膨胀土的裂隙发育,在机制砂掺量为10%时抑制效果最好,能较好抑制改良土裂隙集中发育,且在10%掺量下改良土的抗剪强度衰减幅度最小,收缩和膨胀特性方面也表现最佳。本试验验证了机制砂可延缓膨胀土在干湿循环过程中的裂隙发育和抗剪强度衰减,并且能改良土样的收缩膨胀变形特性,改良效果受机制砂掺量影响,综合考虑各项因素,机制砂掺量应控制在10%以内。 展开更多
关键词 机制砂改良土 干湿循环 强度衰减 收缩变形 膨胀变形
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Numerical analysis of crack generation within embankment built on expansive soil foundation 被引量:2
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作者 程永振 黄晓明 +1 位作者 李昶 李连友 《Journal of Southeast University(English Edition)》 EI CAS 2017年第2期224-229,共6页
In order to analyze the initial cracking behavior of highway embankment in the regions of expansive soil, the changes in peaks of tensile stress and their location on top of the embankment for a typical highway embank... In order to analyze the initial cracking behavior of highway embankment in the regions of expansive soil, the changes in peaks of tensile stress and their location on top of the embankment for a typical highway embankment section were simulated by ABAQUS. The simulation results indicate that the matric suction was a concave distribution on top of the expansive soil foundation and that it induced differential deformation of foundation and embankment. The peaks of tensile stress on top of the embankment are not located at a fixed site, but gradually move towards the shoulder following the evaporation duration. When the evaporation intensity is larger, the peak of tensile stress on top of embankment increases at a faster rate following the evaporation duration,and its location is closer to the shoulder. The thicker expansive soil layer helps the peaks of tensile stress to reach the critical tensile stress quickly, but the embankment cannot crack when the expansive soil layer is no more than 1.5m after 30d soil surface evaporation; the higher the embankment, the smaller the peak of tensile stress occurring on top of the highway embankment, and its location will be further away from the shoulder. Therefore, a higher embankment constructed on a thinner expansive soil layer can reduce the crack generation within the highway embankment. 展开更多
关键词 expansive soil foundation soil shrinkage CONSOLIDATION tensile stress embankment cracks
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单、双孔隙结构非饱和黏土孔隙分布变化规律试验研究
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作者 张思奇 裴华富 +1 位作者 谭道远 朱鸿鹄 《岩土力学》 EI CAS CSCD 北大核心 2024年第2期353-363,374,共12页
由于孔隙分布曲线的复杂性,在非饱和过程中黏土的孔隙结构变化规律尚不明晰,这导致基于孔隙分布模型计算土-水特征曲线存在较大的误差。针对这一问题,基于干缩试验与压汞试验,对单孔与双孔结构重塑黏土在脱湿过程中孔隙分布曲线的变化... 由于孔隙分布曲线的复杂性,在非饱和过程中黏土的孔隙结构变化规律尚不明晰,这导致基于孔隙分布模型计算土-水特征曲线存在较大的误差。针对这一问题,基于干缩试验与压汞试验,对单孔与双孔结构重塑黏土在脱湿过程中孔隙分布曲线的变化规律进行了定量分析。研究表明:在脱湿过程中孔隙分布曲线存在平移、缩放等变换。构建了t分布和双t分布函数,提取了孔隙分布曲线的自由度、峰值、峰值对应的孔隙直径作为特征参数来表征孔隙分布变化规律,发现了特征参数和土样孔隙比之间存在较好的线性关系。基于试验结果,建立了含水率-孔隙比-孔隙分布曲线关系,提出了一个考虑孔隙结构变化的重塑黏土土-水特征曲线计算框架。最后,与试验测得的土-水特征曲线进行比较,验证了所提出的计算方法的准确性。 展开更多
关键词 黏土 非饱和土 孔隙分布曲线 压汞试验 土-水特征曲线 干缩试验
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水泥钢渣稳定土的路用性能研究与工程应用
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作者 王本仁 张刘阳 +2 位作者 刘西峰 段旭林 陈潇 《硅酸盐通报》 CAS 北大核心 2024年第4期1472-1481,共10页
在道路材料中应用钢渣是钢渣规模化消纳的重要途径之一,水泥钢渣稳定土是一类新型路面基层材料。本文针对水泥剂量、钢渣掺量对水泥钢渣稳定土抗压强度以及劈裂强度的影响进行了研究,同时还探讨了钢渣掺量对水泥钢渣稳定土干缩性能的影... 在道路材料中应用钢渣是钢渣规模化消纳的重要途径之一,水泥钢渣稳定土是一类新型路面基层材料。本文针对水泥剂量、钢渣掺量对水泥钢渣稳定土抗压强度以及劈裂强度的影响进行了研究,同时还探讨了钢渣掺量对水泥钢渣稳定土干缩性能的影响。结果表明:随着钢渣掺量的增加,水泥钢渣稳定土的无侧限抗压强度和劈裂强度逐渐提高,折压比先增加后降低,干缩系数逐渐降低;随着水泥剂量的提高,水泥钢渣稳定土的28、90 d无侧限抗压强度和劈裂强度逐渐提高,水泥剂量提高至5%(质量分数)时,折压比出现一定幅度的降低。采用配合比(质量分数)水泥外掺5%,钢渣掺量60%,土掺量40%进行工程应用研究,试验段经过现场检测,工程应用效果良好,具有较好的经济效益。 展开更多
关键词 道路材料 钢渣 力学性能 干缩性能 工程应用
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机制砂级配及含量对压实膨胀土干缩裂隙演化规律
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作者 张少卫 党发宁 +1 位作者 范翔宇 管浩 《西安工业大学学报》 CAS 2024年第3期366-374,共9页
为研究砂含量以及级配对压实膨胀土干缩开裂的影响,以勉县滑坡点膨胀土为研究对象,制备了五种机制砂含量和四种机制砂级配的压实膨胀土试样,开展一系列压实土样干燥试验。利用图像处理技术并结合分形理论,对表面干缩裂隙的发育过程及最... 为研究砂含量以及级配对压实膨胀土干缩开裂的影响,以勉县滑坡点膨胀土为研究对象,制备了五种机制砂含量和四种机制砂级配的压实膨胀土试样,开展一系列压实土样干燥试验。利用图像处理技术并结合分形理论,对表面干缩裂隙的发育过程及最终状态的裂隙网络几何参数进行了量化分析。研究结果表明:表面裂隙面积的增加,前期表现为裂隙长度的增加,后期表现为裂隙宽度的增加;砂级配相同,随着砂含量从0%增加到40%,最终的表面裂隙率呈现依次降低的趋势,分别为13.18%,11.39%,10.47%,8.91%,7.68%;砂含量(40%)相同,随砂级配从[0.15 mm,0.3 mm)增加到[1.18 mm,2.36 mm),表面裂隙率依次减小,分别为7.68%,7.66%,4.38%,3.75%;裂隙分形维数的变化规律与表面裂隙率相同。 展开更多
关键词 土力学 压实膨胀土 机制砂 干缩裂隙 分形维数
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Influence of cutterhead opening ratio on soil arching effect and face stability during tunnelling through non-uniform soils
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作者 Xue-Jian Chen Pei-Pei Fang +3 位作者 Qiu-Nan Chen Jun Hu Kai Yao Yong Liu 《Underground Space》 SCIE EI CSCD 2024年第4期45-59,共15页
Tunnelling has increasingly become an essential tool in the exploration of underground space.A typical construction problem is the face instability during tunnelling,posing a great threat to associated infrastructures... Tunnelling has increasingly become an essential tool in the exploration of underground space.A typical construction problem is the face instability during tunnelling,posing a great threat to associated infrastructures.Tunnel face instability often occurs with the soil arching collapse.This study investigates the combined effect of cutterhead opening ratio and soil non-uniformity on soil arching effect and face stability,via conducting random finite-element analysis coupled with Monte–Carlo simulations.The results underscore that the face stability is strongly associated with the evolution of stress arch.The obtained stability factors in the uniform soils can serve as a reference for the design of support pressure in practical tunnelling engineering.In addition,non-uniform soils exhibit a lower stability factor than uniform soils,which implies that the latter likely yields an underestimated probability of face failure.The tunnel face is found to have a probability of failure more than 50%if the spatial non-uniformity of soil is ignored.In the end,a practical framework is established to determine factor of safety(FOS)corresponding to different levels of probability of face failure considering various opening ratios in non-uniform soils.The required FOS is 1.70 to limit the probability of face instability no more than 0.1%.Our findings can facilitate the prediction of probability of instability in the conventionally deterministic design of face pressure. 展开更多
关键词 TUNNEL Face stability soil arching effect Cutterhead opening ratio non-uniform soil Random field
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膨胀性裂土病害产生机理及综合防治措施研究 被引量:1
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作者 张德龙 苗学云 沈朝政 《山西建筑》 2024年第3期82-85,89,共5页
膨胀土是指吸水后显著膨胀、失水后显著收缩的高塑性黏土,随着膨胀土问题的日渐加剧,膨胀土对施工环境的影响已成为当今岩土工程中亟待解决的全球性技术难题之一。在文献调研、资料收集及成果汇总的基础上,对膨胀土的基本性质、胀缩机... 膨胀土是指吸水后显著膨胀、失水后显著收缩的高塑性黏土,随着膨胀土问题的日渐加剧,膨胀土对施工环境的影响已成为当今岩土工程中亟待解决的全球性技术难题之一。在文献调研、资料收集及成果汇总的基础上,对膨胀土的基本性质、胀缩机理进行了总结,从病害产生部位、形态特征、成因及破坏速度等角度系统划分了膨胀土“四类”破坏类型;通过堑坡深度、垂直方向、坡顶及坡底水平方向变形量提出了膨胀土堑坡“四个”活动层面;结合膨胀土地区路基、边坡、建筑物及其他各类病害特点,总结了相对应的技术措施,研究成果对于膨胀土地区在建和拟建工程有参考意义。 展开更多
关键词 膨胀土 胀缩性 堑坡稳定性 破坏类型 病害防治
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水泥稳定盾构渣土的收缩性能研究
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作者 王书灏 王滨 +3 位作者 王军 王凌威 李卓然 高英 《现代交通技术》 2024年第3期5-12,共8页
针对土压平衡(earth pressure balance,EPB)盾构渣土的资源化再利用问题,开展水泥稳定EPB盾构渣土作为路用材料的收缩性能研究,主要通过干缩试验及温缩试验进行评价。结果表明,EPB盾构渣土的干缩系数在前31天变化明显,温缩系数则随着温... 针对土压平衡(earth pressure balance,EPB)盾构渣土的资源化再利用问题,开展水泥稳定EPB盾构渣土作为路用材料的收缩性能研究,主要通过干缩试验及温缩试验进行评价。结果表明,EPB盾构渣土的干缩系数在前31天变化明显,温缩系数则随着温度的升高呈现波动性上升趋势;水泥掺量的增加不仅会影响EPB盾构渣土体积对温度、水分变化的敏感程度,还会进一步增强温度对体积的影响;与常用的水泥稳定碎石相比,EPB盾构渣土受掘进工艺影响缺少大粒径骨料的嵌挤作用,因而收缩性能较差。因此,在EPB盾构渣土施工过程中不仅需要严格控制水泥用量,还应掺入些许骨料调整其级配。 展开更多
关键词 EPB盾构渣土 底基层 收缩性能 级配
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基于荷载作用的膨胀土工程特性试验研究
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作者 廖嵩隆 《黄河水利职业技术学院学报》 2024年第1期36-39,共4页
为了全面了解膨胀土的工程特性,找出合理的膨胀土工程处理方案,进行了荷载作用下的膨胀试验和收缩试验,得出如下结论:无竖向荷载时,土样膨胀率最大;足够大的荷载可以控制膨胀土的膨胀性;土样的干密度与竖向荷载成正比变化;荷载与土样收... 为了全面了解膨胀土的工程特性,找出合理的膨胀土工程处理方案,进行了荷载作用下的膨胀试验和收缩试验,得出如下结论:无竖向荷载时,土样膨胀率最大;足够大的荷载可以控制膨胀土的膨胀性;土样的干密度与竖向荷载成正比变化;荷载与土样收缩性相关指标的关系曲线也同样存在控制拐点。 展开更多
关键词 膨胀土 工程特性 特性试验 荷载作用 膨胀率 收缩率 胀缩变形
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建筑垃圾和纤维联合改性膨胀土路用性能研究
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作者 郑和武 《粉煤灰综合利用》 CAS 2024年第1期1-5,共5页
为了提高膨胀土路用性能和实现建筑垃圾资源化利用,本文研究了玻璃纤维与建筑垃圾改良膨胀土的强度特性和胀缩特性,并结合微观特征探索改良机理。研究发现:建筑垃圾和玻璃纤维均能显著提高膨胀土的强度和降低膨胀土的胀缩特性。建筑垃... 为了提高膨胀土路用性能和实现建筑垃圾资源化利用,本文研究了玻璃纤维与建筑垃圾改良膨胀土的强度特性和胀缩特性,并结合微观特征探索改良机理。研究发现:建筑垃圾和玻璃纤维均能显著提高膨胀土的强度和降低膨胀土的胀缩特性。建筑垃圾和玻璃纤维掺量过高会导致改良膨胀土内部孔隙无法有效填充以及纤维成团现象,从而影响改良膨胀土的路用性能。建筑垃圾和纤玻璃维的最佳掺量分别为40%和0.6%;微观测试结果表明纤维能为膨胀土提供附着点,从而达到增密膨胀土内部结构的效果。上述研究成果能为膨胀土改良和建筑垃圾的资源化利用提供理论基础。 展开更多
关键词 膨胀土 建筑垃圾 玻璃纤维 强度特征 胀缩特性 微观结构
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支撑渗沟在膨胀土浅层路堑边坡处治中的应用
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作者 李晟 刘浪 《科技资讯》 2024年第5期122-124,共3页
边坡对道路工程的安全起着至关重要的影响,通过结合工程实例,在分析郴州某道路膨胀土浅层路堑边坡发生破坏原因的基础上,结合支撑渗沟的作用原理以及尚未完全破坏的坡面人字形骨架,提出了“支撑渗沟+尚未破坏的人字形骨架+坡脚恢复挡土... 边坡对道路工程的安全起着至关重要的影响,通过结合工程实例,在分析郴州某道路膨胀土浅层路堑边坡发生破坏原因的基础上,结合支撑渗沟的作用原理以及尚未完全破坏的坡面人字形骨架,提出了“支撑渗沟+尚未破坏的人字形骨架+坡脚恢复挡土墙”的处治方案,相比其他的处治方案更经济、易施工,且防护和排水效果明显。可作为其他类型工程的借鉴方案。 展开更多
关键词 膨胀土浅层路堑边坡 吸水膨胀 失水收缩 支撑渗沟
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