| 粉质黏土周期荷载后的不排水强度衰化特性 |
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| 引用本文： | 王淑云,鲁晓兵,赵京,王爱兰.粉质黏土周期荷载后的不排水强度衰化特性[J].岩土力学,2009,30(10):2991-2995. |
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| 作者姓名： | 王淑云 鲁晓兵 赵京 王爱兰 |
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| 作者单位： | 中国科学院力学研究所,水动力学与海洋工程重点实验室,北京,100190 |
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| 基金项目： | 中国科学院知识创新十·五重大项目资助 |
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| 摘 要： | 在3种不同围压下进行了一系列重塑粉质黏土的静三轴和动-静三轴不排水剪切试验，得到了不同动应力水平条件下粉质黏土的孔压、动应变和不排水剪切强度值。通过对土样的不排水强度、孔压和动应变的无量纲化处理，确定了周期荷载作用后粉质黏土的不排水强度比与动载引起的孔压比和动应变比之间的相关关系。试验结果表明：粉质黏土在周期荷载作用后的不排水强度衰减程度取决于动载引起的动应变比值和孔压比值。当周期荷载引起的动应变比值小于0.1时，孔压比增长较快，土样的不排水强度几乎没有衰减；当动应变比大于0.1时，孔压比增长变慢，土样的不排水强度明显衰减；当动应变比值接近1时，孔压比值达到0.9，土样的不排水强度衰减程度约达到55 %
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| 关 键 词： | 周期荷载 周期荷载后 不排水强度 孔压比 动应变比 |
| 收稿时间： | 2008-03-19 |
Post-cyclic loading undrained strength degradation characteristics of silty clay |
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| WANG Shu-yun,LU Xiao-bing,ZHAO Jing,WANG Ai-lan.Post-cyclic loading undrained strength degradation characteristics of silty clay[J].Rock and Soil Mechanics,2009,30(10):2991-2995. |
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| Authors: | WANG Shu-yun LU Xiao-bing ZHAO Jing WANG Ai-lan |
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| Institution: | Key Laboratory of Hydrodynamics and Ocean Engineering, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | A series of static and cyclic-static consolidated-undrained triaxial compression tests on remolded silty clay samples under three different confining pressures are carried out; and then the post-cyclic loading undrained strength, the pore pressure and the cyclic strain are obtained under various cyclic loading stress conditions. By the non-dimensional analyses of post-cyclic loading strength, pore pressure and cyclic strain, the relationships between the post-cyclic loading strength ratio and the cyclic strain ratio or the pore pressure ratio are established. From test data, it is shown that the post-cyclic loading undrained strength degradation of silty clay depends on the pore pressure ratio and the cyclic strain ratio caused by cyclic loading. The post-cyclic loading strength hardly decreases when the cyclic strain ratio is smaller than 0.1 while the pore pressure ratio begins to rapidly increase. And it decreases in a great deal when the cyclic strain ratio is larger than 0.1 and the pore pressure ratio increases slowly. The degree of post-cyclic loading strength degradation is about 55 % when the cyclic strain ratio is close to 1 and the pore pressure ratio is 0.9 |
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| Keywords: | cyclic loading post-cyclic loading undrained strength pore pressure ratio cyclic strain ratio |
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