Experimental Study on Shear Strength of Dump Slope in Mining Area Enhan-ced by Root-Soil Composite
With the rapid expansion of China's economy,the demand for coal mining resources has significantly increased,predominantly utilizing low-cost open-pit mining methods.This approach results in the formation of numerous slopes within the discharge field.Under conditions of sustained rainfall,these slopes are highly susceptible to various geohazards,including landslides and soil erosion.Therefore,it is imperative to implement effective protective measures to ensure the safety of coal mine operations and the surrounding regions.To investigate the soil consolidation and slope protection mechanisms of salal root-soil complexes on the slopes of mine discharge sites,a quantitative analysis was conducted to assess how the root system enhances soil shear strength.This study focuses on the mine discharge site in Nalin Taohai Town,Yijinholo Banner,Erdos City,Inner Mongolia.Four gradients of main root content(0,5%,10%,and 15%)were established,and large-scale direct shear tests were performed on salix root-soil composites under vertical stresses of 50 kPa,100 kPa,and 150 kPa.(1)As the content of primary roots gradually increased,the shear strength of the root-soil composite correspondingly improved,with the cohesive force of root-containing specimens exhibiting an increase of 3.28 to 5.43 times compared to that of plain soil during shear failure.(2)When the shear failure of the salix root-soil composite adhered to the Moore-Cullen strength failure criterion,the cohesive force of the root-containing specimens increased by 3.28 to 5.43 times relative to that of vegetative soil.(3)Pearson's correlation analysis and regression equation were constructed.The results indicate a significant positive cor-relation between the cohesive force of the root-soil composite and the primary root content(P<0.05,r=0.953).However,neither the primary root content nor the vertical stress exhibited a significant correlation with the angle of internal friction(P>0.05).The friction between the root system and soil particles,coupled with the accumulation of numerous soil particle agglomerates around the root system,collectively forms an anchoring and reinforcing structure that significantly enhances cohesive force.The findings of this study offer a robust theoretical foundation for the ecological restoration of slopes at discharge sites in mining areas through plant cultivation,as well as for the effective prevention of disasters such as shallow landslides and soil erosion.
salix psammophilaroot-soil compositeslopes of mine dumpsshear strengthvegetated slopelarge straight shear test
万方数据
维普
