典型草本植物防护砂性土边坡表层土体作用分析

The protective effect of typical herbs on surface soil of sandy soil slope

通过典型草本植物护坡含根系砂性土直剪试验,得到草本植物防护作用下砂性土边坡表层含根系土的抗剪强度,分析了典型草本植物通过根系力学作用及植被水文效应两方面对砂性土边坡表层土体的防护作用。草本植物能够有效截留降雨、削弱溅蚀,抑制地表径流、控制土粒流失、降低孔隙水压力、提升土体黏聚力,以及增加土体抗剪强度。

A large number of sand-soil slopes,sand foundations,and sand dams were built in construction of northern China.The vegetation revetment technology was an important method to control sandy soil slope.And the protective effect should be discussed intensively.According to the direct shear test of sand-soil with root system for the typical herbaceous plant slope protection,the shear strength of soil on the surface of sandy soil slope with the protection of herbaceous plants could be obtained.The protective effects of the typical herbaceous plant for the surface soil of sandy slope were analyzed by mechanical effect of root system and hydrological effect of vegetation.The soil erosion could be controlled,the pore water pressure in soil could be reduced and the cohesive force of soil could be enhanced with the protection of herbaceous plants.And the shear strength of sand-soil slope surface is increased.