摘要
由于土体的粒组成分不同,所以在不同含水率条件下土的物理力学性质存在差异.为研究某水电站右岸坝肩岩体层内错动带夹层土样(细粒含量少)与某水库右岸边坡滑带土土样(细粒含量多)的物理力学性质,本文将通过颗分试验、直剪试验等来探究不同含水率对细粒含量不同的土的抗剪强度、内聚力及内摩擦角的影响.研究结果表明:细粒含量少和细粒含量多的抗剪强度均与土的含水率有关,随着含水率的增加抗剪强度均减小,且都是先小幅降低,后在塑限处急剧降低.随着含水率的增加,内聚力均逐渐减小,且内聚力与含水率之间均有良好的对数关系.随着含水率的增加细粒含量多的土内摩擦角较细粒含量少的土内摩擦角变化明显,同时细粒含量多的土内摩擦角变化出现明显的分段现象,土的塑限即为转折点.
Due to the different composition of soil,the physical and mechanical properties of soil are different under different water content. In order to study the physical and mechanical properties of the right bank dislocation belt soil（soils with low content of fine grain） of a hydropower station and the right bank slope soil（soils with high content of fine grain） of a reservoir. In this paper,the shear strength,cohesion and internal friction angle of soils of different fine grain content under different water content were investigated by soil particle analysis test and direct shear test. The results indicated that the shear strength of soils with low or high content of fine grain is both related to soil water content. With water content increasing,soils with low and high content of fine grain of the shear strength both is firstly small margin declines and then sharply declines at the PL-plastic limit. With the increase of water content,soils with low and high content of fine grain both have a good logarithmic relationship between cohesion and water content,and the cohesion both decreases. With the increase of water content,the internal friction angle of soils with high content of fine grain is more obvious changes than soils with low content of fine grain. And the change of internal friction angle in soils with high content of fine grain appeared obvious segmentation phenomenon that the PL-plastic limit of soil was the turning point.
作者
朱秋雷
韩爱果
任光明
ZHU Qiu-lei;HAN Ai-guo;REN Guang-ming(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China)
出处
《天津理工大学学报》
2018年第5期46-51,共6页
Journal of Tianjin University of Technology
基金
国家自然科学基金(41572291)
关键词
细粒含量
直剪试验
含水率
抗剪强度
fine grain content
direct shear test
water content
shear strength
