海积软黏土力学特性与应力路径的关联性研究

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摘要通过固结不排水条件下的等应力比加荷试验,探讨了原状海积软黏土的应力应变关系、切线模量、孔压特性与应力路径的关联性。结果表明,同样固结压力下,在0.25π≤θ≤0.75π的试验应力路径范围内,随着应力路径方向角θ的增大,土体的切线模量逐渐增大,极限强度先增大后减小,在θ=0.44π～0.56π间存在峰值；单位剪应力引起的孔压与单位球应力引起的孔压呈线性关系,且随着应力路径方向角的增大,孔压由正孔压逐渐变为负孔压,球应力引起孔压与剪应力引起孔压的比例线性减小。

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	熊春发
	孔令伟
	杨爱武

关键词 ：海积软黏土, 应力路径, 力学特性, 关联性

Abstract：Through triaxial tests on different stress ratios under consolidated and undrained conditions, the correlation among stress-strain curve of undisturbed marine soft clays, tangent modulus, pore pressure and stress path is discussed. The results show that, under the same consolidation pressure, when the direction angle of the stress path increases, the tangent modulus will increase, the ultimate strength will change from increasing to decreasing and reach the peak value in the range of θ=0.44π～0.56π. There is a linear relationship between the unit pore pressure caused by shear stress and the unit pore pressure caused by isotropic stress. When the direction angle of the stress path increases, the pore pressure will change from positive to negative, and the ratio of the pore pressure caused by isotropic stress to the shear stress will decrease linearly.

Key words： marine soft clay stress path mechanical property correlation

收稿日期: 2013-06-07

TU447

基金资助:国家自然科学基金项目（51179186）

作者简介: 熊春发(1982- )，男，安徽芜湖人，博士，主要从事特殊土力学方面的研究工作。E-mail: bear0306@163.com。

引用本文:

熊春发, 孔令伟, 杨爱武. 海积软黏土力学特性与应力路径的关联性研究[J]. 岩土工程学报, 2013, 35(zk2): 341-345. XIONG Chun-fa, KONG Ling-wei, YANG Ai-wu. Correlation between mechanical properties of marine soft clay and stress path. Chinese J. Geot. Eng., 2013, 35(zk2): 341-345.

链接本文:

http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2013/V35/Izk2/341

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