| 循环荷载作用下软黏土刚度软化特征试验研究 |
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| 引用本文： | 王军,蔡袁强,徐长节.循环荷载作用下软黏土刚度软化特征试验研究[J].岩土力学,2007,28(10):2138-2144. |
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| 作者姓名： | 王军 蔡袁强 徐长节 |
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| 作者单位： | 1. 浙江大学,软弱土与环境土工教育部重点实验室,杭州,310027
2. 浙江大学,软弱土与环境土工教育部重点实验室,杭州,310027;温州大学,建筑与土木工程学院,浙江,温州,325027 |
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| 摘 要： | 循环荷载作用下,软黏土将发生软化现象,而以往的研究中大多未考虑初始偏应力的影响。通过对萧山正常固结饱和软黏土进行应力控制的循环三轴试验,研究了循环荷载作用下土体的刚度软化情况。通过分析每一次循环过程中割线剪切模量的变化规律,探讨了循环次数、循环应力水平、初始偏应力对刚度软化的影响。结果表明,随着循环次数的增加,土体刚度逐渐减小;循环应力水平的提高,初始偏应力的施加将加快刚度软化。在试验的基础上推导了反映土体刚度软化规律的经验公式,得到了萧山软黏土的破坏刚度比。
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| 关 键 词： | 刚度 软化 循环荷载 软黏土 |
| 文章编号： | 1000-7598-（2007）10-2138-07 |
| 收稿时间： | 2005-10-17 |
| 修稿时间： | 2005-10-17 |
Experimental study on degradation of stiffness of saturated soft clay under undrained cyclic loading |
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| WANG Jun,CAI Yuan-qiang,XU Chang-jie.Experimental study on degradation of stiffness of saturated soft clay under undrained cyclic loading[J].Rock and Soil Mechanics,2007,28(10):2138-2144. |
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| Authors: | WANG Jun CAI Yuan-qiang XU Chang-jie |
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| Institution: | 1. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Zhejiang University, Hangzhou 310027, China; 2. Architecture and Civil Engineering College, Wenzhou University, Wenzhou 325027, China |
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| Abstract: | Degradation of stiffness and strength will occur in soft clay under cyclic loading because of the generation of pore pressure. Unfortunately, previous work rarely incorporated the effect of initial deviator stress on cyclic degradation behavior. In this paper, the degradation of stiffness characteristics of normally consolidated soft clay subjected to undrained cyclic triaxial loading are investigated at different numbers of cycles, different cyclic stress levels and different initial deviator stresses. The influence of these three factors on the shear stiffness is investigated by analyzing the secant shear modulus in each unload-reload loop. It’s observed that the stiffness reduced with progressive number of cycles. On the other hand, higher cyclic stress level and initial deviator stress accelerate the degradation of stiffness. A linear relationship is obtained if secant shear modulus is plotted against numbers of cycles on a semi-log scale. This relationship has been synthesized in the form of an empirical equation. The failure stiffness ration for Xiaoshan soft clay is obtained from the equation. |
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| Keywords: | stiffness degradation cyclic loading soft clay |
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