循环应力历史对饱和软黏土小应变剪切模量的影响

谷川; 蔡袁强; 王军; 杨芳; 胡秀青

循环应力历史对饱和软黏土小应变剪切模量的影响 English Version

谷川¹,
蔡袁强^1,2,
王军²,
杨芳²,
胡秀青²

1. 浙江大学软弱土与环境土工教育部重点实验室，浙江杭州 310027；2. 温州大学建筑工程学院，浙江温州 325035

详细信息

作者简介:
谷川(1986– )，男，山东济宁人，博士研究生，主要从事土动力学方面的研究工作。

中图分类号: TU47
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出版历程
- 收稿日期: 2011-07-14
- 发布日期: 2012-10-09

Effects of loading history on small-strain shear modulus of saturated clays

1. Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou 310027, China; 2. College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, China

摘要

摘要: 饱和软黏土的小应变剪切模量Gmax是其基本力学参数。在进行饱和软黏土的有效应力动力分析时，往往认为小应变剪切模量Gmax只随着有效应力的降低而衰减，而不受动荷载应力历史的影响，因此基本采用静力状态下得到的小应变剪切模量代替相同有效应力时动力状态下的小应变剪切模量。但是，对于饱和软黏土，目前并没有足够多的试验数据证明这一假设。基于这一考虑，通过GDS动三轴及弯曲元测试系统，研究了循环应力历史对饱和软黏土小应变剪切模量的影响，试验结果表明循环应力历史对Gmax的影响较大，采用静力状态下得到的Gmax代替动力状态下的Gmax并不可取。同时，发现可以使用小应变剪切模量的突变来表征饱和软黏土的结构破坏。
- 小应变剪切模量 /
- 弯曲元 /
- 动三轴 /
- 应力历史
Abstract: The small-strain shear modulus is the main physical index of saturated clays. In the methods for the effective stress analysis, the mall-strain shear modulus obtained from static tests is often used in the dynamic analysis without regard to the influence of loading history. However, for saturated clays, this assumption has not been proved by enough test data. Based on this consideration, a few cyclic triaxial and bender element tests were conducted to study the influence of loading history on the small-strain shear modulus of saturated clays. The test results indicate that the influence is great and the above assumption is not correct. Meanwhile, it is also found that the small-strain shear modulus can be used to determine the failure criterion of saturated clays under cyclic loading.
- small-strain shear modulus /
- bender element /
- cyclic triaxial test /
- loading history

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参考文献(18)

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