乔木根土复合体的抗剪强度实验研究  

Experimental study on the influence of arborwood root on the shear strength of root-soil composite

作　　者：丰田[1] 李光范[1] 胡伟[1] 陈新[1] 赵璞[1] 

机构地区：[1]海南大学土木建筑工程学院,海口570228

出　　处：《应用力学学报》2018年第3期517-523,共7页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(51508141);"十二五"国家科技支撑计划课题(2013BAK05B00);海南省科协青年科技英才创新计划项目(201506);海南省研究生创新科研课题(Hys2017-22)

摘　　要：为了探索乔木根和非饱和红粘土所组成的根土复合体的抗剪强度与土体含水量的关系,及平行双根与剪切面夹角大小对抗剪强度的影响,采用课题组自行研制的大型土复合体直剪仪,进行了大型直剪实验。结果表明:当含水量大于塑限后,根土复合体的抗剪强度随含水量的增大而减小;当含水量越大,越接近液限时,抗剪强度的峰值与最小值越接近;当含水量一定时,根系与剪切面呈一个大于45°的锐角时,抗剪强度最高;抗剪强度峰值出现对应的角度与含水量有关,含水量越大,峰值出现对应的角度越大,且越接近90°。本文为拓展乔木根系对边坡抗剪强度的影响提供了实验依据,对乔木的固土护坡的研究具有积极意义。In order to explore the shear strength of the root-soil composite system of arbor and unsaturated red clay on the water content and the angle between parallel root and shear plane, a large-scale direct shear test is carried out on a large-scale soil-composite direct shear apparatus developed by the research group. The results show that the shear strength of the root-soil composite system decreases with the increase of soil water content when the water content is higher than the plastic limit. When the water content is close to the liquid limit, the peak value of shear strength is closer to the average shear strength. When the water content is constant, and the root system and shearing plane are at an acute angle greater than 45°, the shear strength is the highest; the shear strength peak corresponds to the angle and water content, when the water content is bigger, the angle corresponding to the peak value is also bigger, and is closer to 90°. The results of the study provide an experimental basis for expanding the effects of arbor root system on the shear strength of slope, and it has positive significance for the study of slope protection.

关 键 词：乔木根系 根土复合体 含水量 抗剪强度 

分 类 号：TU4[建筑科学—土工工程]