工程地质学报2016，Vol.24Issue(3)：384-390,7.DOI:10.13544/j.cnki.jeg.2016.03.007
植物根系对低液限粉质黏土边坡浅层土体抗剪强度影响的试验研究
EXPERIMENTAL STUDY ON INFLUENCE OF PLANT ROOTS TO SHEAR STRENGTH OF LOW LIQUID LIMIT SILTY CLAY AT SHALLOW DEPTH OF SLOPE
摘要
Abstract
As ecological balance and environmental protection have been increasingly recognized and valued , many developed countries have paid attentions to the ecological restoration and protection technology of slope engineering . Such technology has become the preferred solution for disaster prevention and erosion control and represented the development direction of slope protection .The shear strength of pure soil and the roots -soil composite system of two vegetation species are tested in laboratory .The two species are Astragalus adsurgens Pall .and Caragana microphylla Lam.and are planted in slope composing silty clays with low liquid limit .They are endurable to drought and barren resistance.This paper investigates the effects of different root density and moisture content on shear strength .The results show that the shear strength of the root -soil composite system increases linearly with increasing vertical pressure.Root can increase soil shear strength .The root of Astragalus adsurgens Pall .has the most noticeable effect, which is followed by Caragana microphylla Lam .As the root density increases, the shear strength increases. But, the shear strength of root soil-composite increases firstly and then decreases as the moisture increases .Plant root has little effect on the internal friction angle , while it has larger effect on the cohesion .So the increase of cohesion can greatly improve root-soil composite shear strength .The results of this test have great significance to the ecological protection technology of the slope composing silty clays with low liquid limit and ecological management of mining area in the way of plant selection and configuration .关键词
锦鸡儿/沙打旺/黏聚力/内摩擦角Key words
Caragana microphylla Lam./Astragalus adsurgens Pall./Cohesion/Internal friction angle分类
建筑与水利引用本文复制引用
刘益良,刘晓立,付旭,李宗杰,马腾飞..植物根系对低液限粉质黏土边坡浅层土体抗剪强度影响的试验研究[J].工程地质学报,2016,24(3):384-390,7.基金项目
河北省交通运输厅科技项目（2013－1－50），廊坊市科技计划项目（2015013008），北华航天工业学院科研基金项目（ KY－2015－01）资助． （）
