| 含水率对西昌昔格达组粘土岩抗剪强度的影响研究 |
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| 引用本文： | 张威,徐则民,刘文连,李丽.含水率对西昌昔格达组粘土岩抗剪强度的影响研究[J].工程勘察,2011(5):1-5. |
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| 作者姓名： | 张威 徐则民 刘文连 李丽 |
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| 作者单位： | 昆明理工大学;中国有色金属工业昆明勘测设计研究院;西南石油大学油气藏地质及开发工程国家重点实验室; |
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| 基金项目： | 国家自然科学基金项目(40572159,40772189); 教育部高等学校博士点基金(20060674009); 云南联合基金重点项目(U1033601); 交通部西部科技项目(200831876723) |
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| 摘 要： | 昔格达组是西南地区第四纪的一套静水河湖相沉积地层,岩石矿物成分复杂,粘土岩具有遇水软化、强度随含水率升高而降低的特点.本文以西昌昔格达组粘土岩在不同含水率下的剪切试验为基础,从多角度就含水率对该区粘土岩抗剪强度的影响程度及影响机理进行了分析.试验发现,随着含水率的增加,粘土岩抗剪强度明显降低,含水率对粘土岩粘聚力及内摩...
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| 关 键 词： | 昔格达组 粘土岩 含水率 抗剪强度 |
Study on the influence of water content to shear strength of Xigeda-strata clay rock in Xichang |
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| Zhang Wei,Xu Zemin,Liu Wenlian,Li Li.Study on the influence of water content to shear strength of Xigeda-strata clay rock in Xichang[J].Geotechnical Investigation & Surveying,2011(5):1-5. |
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| Authors: | Zhang Wei Xu Zemin Liu Wenlian Li Li |
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| Affiliation: | Zhang Wei1,Xu Zemin1,Liu Wenlian2,Li Li3(1.Kunming University of Science and Technology,Kunming 650093,China,2.Kunming Prospecting Design Institute of China Nonferrous Metals Industry,Kunming 650011,3.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China) |
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| Abstract: | The Xigeda strata is a set of Quaternary Period’s still water river and lacustrine faces sediments in the Southwest China,and those rock mineral components are very complex.The clay rock is of the features： softening when encountering water and the strength reducing along with moisture content increasing.Based on the shearing tests for Xigeda-strata clay rock under different water contents,the influence of water content to the rock in Xichang and its influence mechanism are analyzed from different aspects.From the tests,it is found that the shear strength of the rock reduce obviously with the increasing of water content,and the influence of water content to the cohesion and the internal friction angle of clay rock is obvious stagnate under some conditions.From the analysis on SEM mineral appearance characteristics of the rock,it is indicated that in the piece frame structure of the rock,the shear strength mainly forms by the coacervate’s three strength components,and that with the increase of water content,all the components decrease which finally causes the coacervate failure and the reduce of shear strength. |
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| Keywords: | Xigeda strata clay rock water content shear strength |
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