Effect of Water Content on Strength of Undisturbed Unsaturated Loess

ZHANG Ning-ning; LUO Ya-sheng; Sha Lei

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Effect of Water Content on Strength of Undisturbed Unsaturated Loess

- Effect of Water Content on Strength of Undisturbed Unsaturated Loess
- Bulletin of Soiland Water Conservation Vol. 32, Issue 5, Pages: 101-104(2013)
- 作者机构：
  
  1. 西北农林科技大学水利与建筑工程学院陕西杨凌,712100
  2. 中国石油长庆油田分公司第五采气厂内蒙古乌审旗,017312
- 作者简介：
- 基金信息：
- DOI：
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- Published：2013
- 稿件说明：
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ZHANG Ning-ning, LUO Ya-sheng, Sha Lei. Effect of Water Content on Strength of Undisturbed Unsaturated Loess[J]. Bulletin of Soiland Water Conservation, 2013, 32(5): 101-104.
DOI：

ZHANG Ning-ning, LUO Ya-sheng, Sha Lei. Effect of Water Content on Strength of Undisturbed Unsaturated Loess[J]. Bulletin of Soiland Water Conservation, 2013, 32(5): 101-104. DOI：

摘要

黄土地区修建的路堤、河堤和土石坝等工程大都位于地下水位以上，呈非饱和状态，且其受力处于平面应变状态。采用TS-526真三轴仪改造的平面应变仪，对非饱和原状黄土在平面应变条件下进行了试验。试验结果表明，非饱和黄土的变形和强度随着含水率的变化呈显著变化，含水率越大，强度越小；土体的偏应力随着轴向变形的变化曲线皆为硬化或者强硬化型；但随着体积的变化土体的偏应力曲线出现明显的拐点；非饱和黄土的抗剪强度参数随含水率的增大而减小。含水率对工程的变形和强度影响比较大。

Abstract

Engineering projects like embankment

riverbank and earth-rock dam in the loess area are mainly built above groundwater level.The loess is in unsaturated state and subject to plane strain.The unsaturated undisturbed loess under the plane strain state is studied by using reformed TS-526 true triaxial apparatus.Results show that deformation and strength of the unsaturated loess vary with water content obviously.The more water content

the less strength of the loess.The deviatoric stress-curves of the loess are hardening and overhardening as axial strain increases and however

there is an obvious inflection point on the deviatoric stress-volume change curves.The shear strength parameter of the loess decreases with increased water content.Water content has a major effect on deformation and strength of the projects.

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