双向耦合循环剪切条件下超固结饱和海洋黏土孔压与强度特性研究

›› 2011, Vol. 32 ›› Issue (S2): 215-221.

双向耦合循环剪切条件下超固结饱和海洋黏土孔压与强度特性研究

刘功勋^{1, 2}，栾茂田²

1. 中交上海航道勘察设计研究院有限公司中交疏浚技术重点实验室，上海 200120； 2. 大连理工大学土木工程学院岩土工程研究所，辽宁大连 116024

收稿日期:2011-04-11 出版日期:2011-08-10 发布日期:2011-08-26
作者简介:刘功勋，男，1978年生，博士，工程师，主要从事软土工程等方面的试验与理论研究
基金资助:
国家自然科学基金资助项目（No. 51079018）

Study of characteristics of pore water pressure and strength of overconsolidated saturated marine clay under bidirectional cyclic loadings

LIU Gong-xun^{1, 2}, LUAN Mao-tian²

1. Key Laboratory of Dredging Technology, Shanghai Waterway Engineering Design and Consulting Co., Ltd. of CCCC, Shanghai 200120, China; 2.Institute of Geotechnical Engineering, School of Civil Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China

Received:2011-04-11 Online:2011-08-10 Published:2011-08-26

摘要/Abstract

摘要： 针对长江口地区的重塑饱和海洋黏土，进行了一系列均等固结条件下的应力控制式轴向-扭转双向耦合循环剪切试验，着重探讨了循环荷载分量比R与超固结比OCR对孔压与动强度特性的影响。试验结果表明，随着R的减小，波动孔压幅值逐渐降低，而残余孔压先降低后升高，R = 1时残余孔压最小。在循环耦合剪切作用过程中，对应相同循环次数，随着OCR的增大，累积孔压变小，而波动孔压幅值却在增大。对应相同循环次数比N/Nf，随着OCR增大，残余孔隙水压力比ur / urmax减小。经归一化处理后ur / urmax-N/Nf关系曲线对于正常固结与超固结饱和黏土可分别用不同的表达式来表达。随着R的降低，破坏循环次数先增大后减小，R = 1时最大。随着OCR的增大，饱和黏土的强度变化减小

关键词: 超固结饱和黏土, 双向耦合循环剪切, 主应力轴持续旋转, 孔压, 动强度

Abstract: Through a series of stress-controlled coupling vertical and torsional shear tests under isotropic consolidation stress conditions on the remoulded saturated marine clay in the Yangtze River estuary, the effects of the ratio of two stress components (R) and the over consolidation ratio (OCR) on the characteristics of pore water pressure and dynamic strength were examined. It is found that with a decrease in R, the amplitude of fluctuated pore water pressure decreases all along, while the residual pore water pressure decreases at first and then increases, and it reaches the lowest at R = 1. At the same cycle number, the residual pore water pressure decreases, while the amplitude of fluctuated pore water pressure increases with the increasing of OCR. At the same ratio of number of cycles (N/Nf) , the ratio of residual pore water pressure (ur / urmax) decreases with the increasing of OCR. The relationship curves of ur / urmax-N/Nf for the normally consolidated and overconsolidated saturated clays can be expressed by different expressions. The cycle number at failure increases at first and then decreases with a decrease in R; and it reaches the most at R = 1. The change of the dynamic strength decreases with an increase in OCR.

Key words: overconsolidated saturated clay, bidirectional cyclic shear, continuous rotation of principal stress axes, pore water pressure, dynamic strength

中图分类号:

TU 411.6

刘功勋，栾茂田. 双向耦合循环剪切条件下超固结饱和海洋黏土孔压与强度特性研究[J]. , 2011, 32(S2): 215-221.

LIU Gong-xun , LUAN Mao-tian. Study of characteristics of pore water pressure and strength of overconsolidated saturated marine clay under bidirectional cyclic loadings[J]. , 2011, 32(S2): 215-221.

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