平面应变条件下非饱和黄土强度特性分析  

An Analysis of the Shear Strength of Unsaturated Loess under Plane Strain Conditions

作　　者：李浩东[1] 骆亚生[1] 王瑞瑞[2] 李林科[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [2]江苏淮安交通勘察设计研究院有限公司,江苏淮安223001

出　　处：《中国农村水利水电》2011年第11期73-76,共4页China Rural Water and Hydropower

基　　金：国家自然科学基金资助项目(50578134);教育部新世纪优秀人才支持计划项目(NECT-06-0864)

摘　　要：在边坡、挡土墙、地基、土石坝等众多实际工程中,土体一般处于平面应变状态。针对目前对黄土在平面应变下的强度的试验研究较少的情况,用真三轴仪改进后的平面应变仪,进行了陕北子洲非饱和重塑黄土在不同含水率和不同侧向压力条件下的强度特性试验,分析含水率和侧向压力对土体强度影响,结果表明:在含水率相同的情况下,土体的强度随着侧向压力σ3从50kPa增加到200kPa而显著增大;在σ3相同的情况下,含水率为7%和12%时土体的强度变化不大,含水率为17%时的土体的强度显著低于7%和12%含水率下土体的强度。在影响土体侧向变形的因素中,侧向力σ3的影响大于含水率的影响。Plane strain state is popular in geotechnical projects. This paper contrapose the shortage of the shear strength study on loess under plane strain conditions, has carried on research on the strength of unsaturated loess from Zizhou of Shaanxi with improved true triaxial apparatus. The results show that with certain water moisture, the shear strength of remolding loess has an increasing trend with the increase in σ3 from 50 kPa to 200 kPa. For a given σ3, when the water moisture is less than a certain critical value the shear strength of remolding loess has a very small change. And when the water moisture exceeds this value, the strength has a substantially decrease. Moreover, σ3 has a greater effect on lateral deformation than water moisture.

关 键 词：非饱和黄土 平面应变 强度特性 侧向变形 

分 类 号：TU411[建筑科学—岩土工程]