环剪试验条件下不同地区黄土的残余强度研究  

Research on Residual Strength of Loess in Different Regions under Ring Shear Tests

作　　者：丁红丽[1] 骆亚生[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

出　　处：《地下空间与工程学报》2017年第6期1511-1516,共6页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(50578134)

摘　　要：利用HJ-1型环剪仪,以泾阳、子洲、兰州3个地区的黄土为研究对象,分析了剪切速率、含水率、竖向应力及干密度4个影响因素对黄土残余强度的影响。结果表明:竖向应力对黄土的残余强度具有最明显的影响,其次是含水率、剪切速率、干密度;分析比较3个地区黄土的残余强度,得出对于粉粒含量较多的兰州黄土,其含水率为19%时对应的残余强度较大;对于粗粒含量较多的子洲黄土,含水率小于最优含水率,同时干密度为1.63 g/cm^3时对应的残余强度较大;对于黏粒含量较多的泾阳黄土,含水率较小,同时干密度较小时对应的残余强度较大。探讨不同地区黄土残余强度的变化规律,对于边坡的稳定性分析及滑坡带的防治具有重要的学术及工程意义。By HJ-1 type ring shear apparatus,taking the loess in Jingyang,Zizhou and Lanzhou as research objects,the impacts of four factors including shear rate,moisture content,vertical stress and dry density on the loess residual strength are analyzed.The results indicate that the most obvious factor on the loess residual strength is vertical stress,followed by moisture content,shear rate and dry density; Comparing the loess residual strength of three areas,it is shown that for Lanzhou loess with a large amount of silt content,the residual strength is larger when the moisture content is 19%,for Zizhou loess with lots of coarse,the residual strength is greater when the moisture content is less than the optimum moisture content while the dry density is 1.63 g/cm^3,for Jingyang loess with a number of clay content,the residual strength is more considerable when the moisture content and dry density are little.The study on variation of loess residual strength in different regions has important academic and engineering significance for the stability analysis of the slope and the comprehensive prevention and control of the landslide.

关 键 词：不同地区 黄土 环剪试验 残余强度 

分 类 号：O346.4[理学—固体力学]