根土复合体抗剪强度试验研究  

Experimental Research on Shear Strength of Root-Soil Complex

作　　者：冯国建[1] 沈凡[1] 李丽蓉[1] 李才文[1] 

机构地区：[1]昆明学院城乡建设与工程管理学院,昆明650412

出　　处：《西南师范大学学报（自然科学版）》2013年第7期129-133,共5页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：云南省教育厅科学研究一般项目(2011Y233)

摘　　要：为研究植物根系的力学效应,分别对土体、芦竹和狗牙根两种植物的根—土复合体试样进行直接剪切试验,对比无根土体与含根系土体的抗剪强度指标,评价其强度效应.结果表明:(1)根—土复合体的抗剪强度随垂直压力的增大而呈线性增大,表明其抗剪强度与剪切面上的法向压力成正比,且符合库仑定律;(2)根—土复合体的黏聚力显著大于无根土的黏聚力,而内摩擦角的变化不显著.根据芦竹和狗牙根两种植物的根—土复合体强度,在护坡效果方面,芦竹优于狗牙根.Direct shear tests were conducted with samples of undisturbed soil and root-soil composite sys tems of Arundo donax L. and bermudagrass （Cynodon d roots, and the shear strength indexes of the soil with and actyl with on） to study the mechanical effect of plant out plant roots were compared. The results showed that the shear strength of the root-soil composite systems increased linearly with increasing vertical pressure, indicating that the direct shear strength of the root-soil composite systems agreed with Coulomb＇s law, being proportional to the normal pressure on the shear plane, and that the cohesion of the soil with roots was obviously larger than that of the soil without roots, while no significant differences ex isted between the two kinds of soils in the internal friction angle. According to the strength of the two root-soil composite systems, Arundo donax was better than Cynodon dactylon for slope protection.

关 键 词：抗剪强度 芦竹 狗牙根 黏聚力 内摩擦角 

分 类 号：TU411.7[建筑科学—岩土工程]