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。
Engineering projects like embankment, riverbank and earthrock 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 TS526 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 stresscurves of the loess are hardening and overhardening as axial strain increases and however, there is an obvious inflection point on the deviatoric stressvolume change curves. The shear strength parameter of the loess decreases with increased water con tent. Water content has a major effect on deformation and strength of the projects.
出处
《水土保持通报》
CSCD
北大核心
2013年第5期101-104,共4页
Bulletin of Soil and Water Conservation
基金
国家自然科学基金项目"基于土体结构性变化的黄土滑坡灾变机理研究"(51178392)
关键词
平面应变
含水率
变形
抗剪强度
plane strain
water content
deformation
shear strength
