细粒层厚度与法向应力对砂土强度影响的试验研究  

Experimental Research on Influences of Fine-grained Layer Thickness and Normal Stress on the Strength of Sandy Soil

作　　者：黄志全[1] 张艳霞[1] 杨永香[1] 李宣[1] 王真[1] 

机构地区：[1]华北水利水电大学,河南郑州450045

出　　处：《华北水利水电大学学报（自然科学版）》2014年第2期69-72,共4页Journal of North China University of Water Resources and Electric Power：Natural Science Edition

基　　金：国家自然科学基金(41140030);国家自然科学基金青年科学基金项目(51009067)

摘　　要：以河北磁县境内的砂土为研究对象，利用环剪仪对砂土的强度特性进行了研究．主要考虑细粒层厚度、法向应力对其峰值强度和残余强度的影响．结果表明：法向应力对砂土的峰值强度和残余强度及强度损失率均有影响，法向应力增大，峰值强度和残余强度均增大，强度损失率也越大，细粒层厚度对砂土强度的影响亦是如此；法向应力为50～200kPa，细粒层厚度为0．0—2．0mm的情况下，强度损失率由10．0％增大到28．0％；剪切面上土的性质决定了剪应力一剪切位移关系曲线的形状．Taking the sandy soil in Cixian County of Hebei Province for a typical example, the strength property of sandy soil was stud- ied using the ring shear apparatus. In the experiment, the influences of fine-grained layer thickness and normal stress on the peak strength and the residual strength of sandy soil were mainly considered. The results indicated that ： the normal stress had obvious effects on peak strength, residual strength and strength loss rate of sandy soil; both the peak strength and the residual strength increased with the increase of the normal stress, and also the strength loss rate; the fine-grained layer thickness was the same case; under the circum- stances of which the normal stresses were in the range of 50 - 200 kPa and fine-grained layer thicknesses were in the range of 0.0 ~ 2.0 mm, the strength loss rate increased from 10.0% to 28.0% ; the soil property of the shear plane determined the shape of the rela- tion curve of shear stress and shear displacement.

关 键 词：砂土 环剪 细粒层厚度 法向应力 峰值强度 残余强度 强度损失率 

分 类 号：TU411.7[建筑科学—岩土工程]