百色重塑膨胀土抗剪强度的试验研究  

Shear strength of Baise r emolded expansive soil

作　　者：赵文建[1] 湛文涛[1] 倪啸[1] 杨和平[1] 

机构地区：[1]长沙理工大学,长沙410076

出　　处：《岩土力学》2009年第S2期244-248,共5页Rock and Soil Mechanics

基　　金：交通部科技项目广西膨胀土地区公路修筑技术研究与应用示范(200831800089)

摘　　要：通过对不同初始含水率、不同干密度下百色重塑膨胀土直剪试验,研究了百色击实重塑膨胀土在不同垂直压力下的峰值强度和残余强度,分析了其抗剪强度的作用机制。研究表明:随着干密度的增加,土体的峰值强度增大,残余强度变化不大;随着上覆荷载的增加,土体的抗剪强度明显增加,表明物理处治技术填筑膨胀土路堤能保证其强度和稳定性;干密度对重塑膨胀土的峰值强度影响较大,而对残余强度影响很小;重塑膨胀土的残余强度与它的结构、应力历史、起始含水率没有关系,而只取决于黏土颗粒的形态、大小、含量和矿物成分等因素。Based on different initial water contents and dry weight densities,the peak intensity and the residual strength of Baise compacted remolded expansive soils under different vertical pressures are studied;and its action mechanism of shear strength is analyzed shear.The research indicates:along with the increase of dry weight density,the peak strength of soil increases,the residual strength changes little;along with the increase of overburden loading,the shear strength of soil increases obviously,which shows that using physical treatment technology filling expansive soil subgrade can ensure its strength and stability.The residual strength of remolded expansive soil is not related to its structure,stress history,and initial water content,it is only decided by clay particle shape,size,content and mineral components.

关 键 词：重塑膨胀土 直剪试验 峰值强度 残余强度 

分 类 号：TU443[建筑科学—岩土工程]