压实黄土直剪强度试验研究  

Experimental Study on Direct Shear Strength of Compacted Loess

作　　者：张志权[1] 井彦林[1] 孔德泉[1] ZHANG Zhiquan JING Yanlin KONG Dequan(School of Civil Engineering, Chang＇an University, Xi＇an Shaanxi 710061, China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《铁道建筑》2016年第12期69-71,共3页Railway Engineering

基　　金：国家自然科学基金(41472267)

摘　　要：为了对比研究不同地区压实黄土的强度特性,对采自西安、兰州和洛川的3种代表性黄土进行了颗粒分析试验、击实试验和直剪试验。试验结果显示:随着黏粒含量的依次减小,3种土样的最优含水率和最大干密度逐渐减小;在最优含水率下随着黏粒含量的减少,应力-应变曲线逐渐由应变强化型向应变软化型过渡,内摩擦角呈微弱的增大趋势,黏聚力没有明显的变化规律;在相同干密度下随着含水率的增加,3种土样的黏聚力和内摩擦角均逐渐减小。In order to compare and study the strength characteristics of compacted loess in the different regions,the particle analysis test,compaction test and direct shear test were conducted with three kinds of representative loess from Xi＇an,Lanzhou and Luochuan.The test results showthat the optimum moisture rate and the maximum dry density of 3kinds of loess gradually decreases with the clay content decreasing successively,the stress-strain curves gradually transfer from the strain hardening type to strain softening type with the decrease of clay content under the condition of optimum water content,the internal friction angle shows a slight increasing trend,there is no obvious change lawof cohesion and the cohesion and internal friction angle of 3 kinds of loess gradually decreases with the moisture content increasing in the condition of same dry density.

关 键 词：路基工程 压实黄土 含水率 直剪强度 试验研究 

分 类 号：TU411.2[建筑科学—岩土工程]