粉质黏土的真三轴试验及强度特性研究

发布时间：2018-07-08 20:24

本文选题：粉质黏土 + 真三轴试验　；参考：《岩土力学》2016年09期

【摘要】：为研究复杂应力路径下粉质黏土强度特性,利用TSW-40型土壤真三轴仪,开展了不同试验条件下粉质黏土的真三轴试验。研究了真三维应力状态下粉质黏土应力-应变曲线变化规律,探讨了含水率、固结围压和中主应力比等试验条件对粉质黏土强度的影响规律,对比分析了真三维应力状态下π平面上粉质黏土试验值与Mohr-Coulomb(简称M-C)强度准则和双剪强度准则的差异。研究结果表明:真三维应力状态下粉质黏土的广义剪应力-剪应变曲线主要表现为应变硬化型。粉质黏土强度随中主应力比和固结围压的增大而增大,随着含水率的增大而减小。π平面上粉质黏土的强度包络线随静水压力ζ的增大向外逐渐扩展,随含水率w的增大向内逐渐收缩。π平面上M-C强度极限线和双剪强度屈服极限线与试验值对比分析表明,M-C强度准则描述土体强度时结果偏小,采用双剪强度准则时结果偏大。
[Abstract]:In order to study the strength characteristics of silty clay under complex stress paths, the true triaxial tests of silty clay under different test conditions were carried out by using TSW-40 soil true triaxial apparatus. The variation law of stress-strain curve of silty clay under true three dimensional stress state is studied. The influence of water content, consolidation confining pressure and the ratio of medium principal stress on the strength of silty clay is discussed. The difference between the test values of silty clay on 蟺 plane and the Mohr-Coulomb (M-C) strength criterion and the double shear strength criterion under the true three dimensional stress state is compared and analyzed. The results show that the generalized shear stress-shear strain curve of silty clay under true three dimensional stress state is mainly strain-hardening. The strength of silty clay increases with the increase of medium principal stress ratio and consolidation confining pressure, and decreases with the increase of water content. The strength envelope of silty clay in 蟺 plane expands gradually with the increase of hydrostatic pressure 味. The results of comparison between M-C strength limit line and double shear strength yield limit line on 蟺 plane and test results show that the results of M-C strength criterion are small when describing soil strength, and the results are larger when double shear strength criterion is adopted.
【作者单位】：辽宁工程技术大学土木与交通学院;辽宁信达检测有限公司;
【基金】：辽宁省教育厅重点实验室支持计划(No.2008S107)~~
【分类号】：TU442

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