生态护坡中根系对土体抗剪强度的试验研究  

Experimental Study on Shear Strength of Root to Soil in Ecological Slope Protection

作　　者：何春晓[1] 蒋希雁[1] 王皓宇 于海 黄前龙 HE Chun-xiao;JIANG Xi-yan;WANG Hao-yu;YU Hai;HUANG Qian-long(Hebei Institute of Architecture and Civil Engineering,Hebei,Zhangjiakou 07500)

机构地区：[1]河北建筑工程学院,河北张家口075000

出　　处：《河北建筑工程学院学报》2018年第2期32-35,70,共5页Journal of Hebei Institute of Architecture and Civil Engineering

基　　金：张家口市科技计划财政资助项目(1611063B);根系固土作用及植物护坡稳定性研究(XB201723)

摘　　要：通过采用直剪试验来探究植物根系对土体抗剪强度的影响.通过根系含量、含水率对重塑粉质粘土抗剪指标的影响规律,得出以下结论:(1)根系加筋土的抗剪强度明显大于素土,并且在含根量0.2%-0.3%含水率9%黏聚力增加显著,说明根能起到加筋作用,能够用来约束土体变形增加抗剪强度.(2)加根对于内摩擦角变化幅度不大,说明根对内摩擦角影响较小.(3)通过拟合曲线可知在一定条件下,黏聚力和含根量呈正相关,呈一次线性分布;黏聚力和含水率呈先增大后减小的趋势,即存在最优含水率.In this paper,the effect of plant roots on shear strength of soil is studied by direct shear test.Through the influence of root content and water content on the anti-shear index of remolded silty clay,the following conclusions are obtained.Firstly,the shear strength of the reinforced soil is obviously greater than that of the plain soil,and the cohesion of the soil with the content of 0.2%-0.3%is increased by 9%,indicating that the root can play a reinforcing role and can be used to restrain the deformation of the soil and increase the shear strength degree.Secondly,the variation of internal friction angle by adding root is not obvious,which shows that the root has little influence on the internal friction angle.Thirdly,through the fitting curve,it is known that under certain conditions,the cohesive force and the content of the root have a positive correlation,showing a linear distribution,and the cohesion and moisture content increase first and then decrease,that is,the optimal water content is present.

关 键 词：抗剪强度 含水率 含根量 生态护坡 

分 类 号：TU4[建筑科学—土工工程]