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Critical Cyclic Stress Ratio of Undisturbed Saturated Soft Clay in the Yangtze Estuary under Complex Stress Conditions

ISSN号：1006-4982
期刊名称：《天津大学学报：英文版》
时间：0
分类：TU431[建筑科学—岩土工程;建筑科学—土工工程] TB64[一般工业技术—制冷工程]
作者机构：[1]State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China, [2]Institute of Geotechnical Engineering, School of Civil Engineering, Dalian University of Technology, Dalian 116024, China
相关基金：Supported by National Natural Science Foundation of China （No. 50639010, 50779003 and 50909014）.

作者：刘功勋[1,2], 栾茂田[1,2], 唐小微[1,2], 王忠涛[1,2], 郭莹[1,2]

关键词：应力条件, 临界循环, 长江口, 土应力, 饱和, complex stress condition, undisturbed saturated soft clay, critical cyclic stress ratio, three-directional anisotropic consolidation, cyclic coupling shear, cyclic torsional shear

中文摘要：

在那里存在批评周期的压力比率当沙或泥土受到周期的装载时。区分稳定的状态或失败状态是一个索引的。土壤静电干扰和动态通用 triaxial 并且扭力砍 Dalian 工业大学在中国开发的仪器被采用在 Yangtze 河口在浸透的软海洋的泥土上执行测试的不同类型。没受到干扰的样品受到 undrained 周期垂直、扭力联合砍并且周期扭力与不同起始的巩固参数在三方向性的各向异性的巩固以后砍。主要主要应力， deviatoric 应力的起始的比率，中间的主要应力的起始的系数和压力模式的起始的取向角度的效果周期在批评周期的压力比率上砍被调查。批评周期的压力比率与增加主要主要应力和 deviatoric 应力的起始的比率的起始的取向角度显著地减少，这被发现。与主要主要应力和 deviatoric 应力的起始的比率的起始的取向角度的效果相比，中间的主要应力的起始的系数的效果是不太明显的。在一样的巩固条件下面，从周期的联合的批评周期的压力比率砍测试是比那低的从周期扭力砍测试，显示压力模式周期砍在批评周期的压力比率上有明显的效果。主要原因是在主要压力方向的连续旋转在周期的联合期间砍损坏土壤的原来的结构多于周期扭力砍。

英文摘要：

There exists a critical cyclic stress ratio when sand or clay is subjected to cyclic loading. It is an index distinguishing stable state or failure state. The soil static and dynamic universal triaxial and torsional shear apparatus developed by Dalian University of Technology in China was employed to perform different types of tests on saturated soft marine clay in the Yangtze estuary. Undisturbed samples were subjected to undrained cyclic vertical and torsional coupling shear and cyclic torsional shear after three-directional anisotropic consolidation with different initial consolidation parameters. The effects of initial orientation angle of major principal stress, initial ratio of deviatoric stress, initial coefficient of intermediate principal stress and stress mode of cyclic shear on the critical cyclic stress ratio were investigated. It is found that the critical cyclic stress ratio decreases significantly with increasing initial orientation angle of major principal stress and initial ratio of deviatoric stress. Compared with the effects of the initial orientation angle of major principal stress and initial ratio of deviatoric stress, the effect of initial coefficient of intermediate principal stress is less evident. Under the same consolidation condition, the critical cyclic stress ratio from the cyclic coupling shear test is lower than that from the cyclic torsional shear test, indicating that the stress mode of cyclic shear has an obvious effect on the critical cyclic stress ratio. The main reason is that the continuous rotation in principal stress directions during cyclic coupling shear damages the original structure of soil more than the cyclic torsional shear does.

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