Experimental Study On The Influence Of ARVS System On The Rainfall Of Expansive Soil Slope

Anchored Reinforced Vegetation System(ARVS)is a new type of flexible ecological protection technology consisting of high performance turf reinforcement mats(HPTRM)and percussion driven earth anchor(PDEA).At present,the research on using the ARVS to protect the expansive soil slope is still in the early stage of exploration.The impact test on the rainfall field of the expansive soil slope of the ARVS has not been carried out yet.Therefore,this paper mainly focuses on the field test of the slope of the expansive soil slope protected by the ARVS.In this paper,through the deployment of bare slopes,grass slopes and ARVS protection slopes in the buffalo livestock farms in the suburbs of Nanning,natural rainfall and artificial simulated rainfall field tests were carried out to monitor the water content,temperature and pore water pressure of the three groups of slope soils.Etc.,and comparative analysis of the amount of erosion and infiltration of the three sets of slopes,and study the effect of rainfall on the slope of the expansive soil slope of the ARVS.The main conclusions of this paper are as follows:(1)During the natural rainfall test monitoring period,the volumetric water content and the deformation of the expansive soil layer of the three groups of slopes changed with the change of rainfall.The ARVS had the smallest change of the protective slope,followed by the grass slope and the bare slope.It shows that the ARVS can effectively restrain the development of fractures in expansive soil slopes and reduce the impact of rainfall on the soil of expansive soil slopes.(2)The stress of the ground anchor is mainly due to the influence of rainfall on the soil moisture content of the slope,which causes the expansion and contraction deformation of the expansive soil to cause the change of the ground anchor.Between 2.8 meters and 1.6 meters deep,the ground anchor axial force has a neutral point and is located below the expansive soil layer.(3)Under the conditions of artificially simulated heavy rain and extraordinarily heavy rain,the volume and moisture content of the expansive soil slope protected by the ARVS and the deformation of the expansive soil layer are the smallest,and the amount of erosion and infiltration of the slope is also the smallest,and soil erosion The smallest.The ARVS protection slope is least affected by the rainfall intensity,and the protection slope soil and slope effect is better than the grass protection effect.