Study On The Selection Of The Ecological Slope Protection Structure By Spraying The Guest Soil In Dalian

Although the guest soil spraying technology can quickly realize the re-greening of the slope,the guest soil layer on the surface of the slope is also prone to surface erosion and surface slippage,which leads to the failure of the guest soil spraying ecological slope protection structure.This article relies on the Dalian City to support high-level talent innovation and entrepreneurship project(prestressed anchor rod combined with plant root ecological slope protection technology theory and design method research)(2018RJ10),using indoor experiments,theoretical analysis,numerical analysis methods,to spray the ecological environment of the guest soil The slope protection structure was selected and studied,and the construction methods and technologies suitable for barren,cold and drought resistance in Dalian were explored.The main results achieved are:(1)With the mixing ratio of loess and black soil,the ratio of rice fiber,aseptic root,and the ratio of rice fiber as variables,the indoor experiment of base material ratio was carried out to analyze the germination number,plant height and direct shear test results,and the best was obtained.Base material ratio.Based on the best base material ratio,the indoor experiment of grass-shrub ratio was carried out with the grass-shrub ratio of herbaceous alfalfa(legume),tall fescue,bluegrass,rye,and shrub acacia as variables,and passed Analyze the survival of grass and shrub vegetation and the results of the shear test of root-soil complexes,and obtain the optimal ratio of grass and shrub.Based on the optimal ratio of grass and shrub,the seed sowing rate is suitable for barren,cold and drought tolerant grass and shrub The vegetation of the guest soil spray podcast soil layer.(2)By mechanically analyzing the frictional reinforcement and occlusal effect of the steel wire mesh in the ecological slope protection structure of the guest soil,a reasonable selection range of the wire mesh aperture and wire diameter is derived;the exposed end of the full-length bonded anchor slope Perform axial and radial deformation analysis,establish a mechanical model,and derive the normal stress and shear stress of the anchor rod in the axial and radial directions;use the limit equilibrium method to derive the stability calculation model of the ecological slope protection structure;analyze the external soil Based on the various factors of the sprayed wire mesh anchor structure,the overall design process of the sprayed soil ecological slope protection structure was obtained,and the design diagram of the ecological slope protection structure of the sprayed soil sprayed steel mesh anchor rod was drawn based on actual engineering cases.(3)Based on indoor experiments and theoretical analysis,under three slopes of 45°,60°and 70°,the anchoring length of the anchor rod,the vertical spacing of the anchor rod,and the thickness of the guest soil layer were used as variables to establish the guest soil spraying wire The three-dimensional numerical analysis model of the ecological slope protection structure of net anchor rods,and the strength reduction method is used to analyze the influence of anchor rod anchorage length,anchor rod vertical spacing,and the thickness of the external soil layer on the stability of the external soil sprayed ecological slope protection structure.Different safety levels in Dalian area The selection of the ecological slope protection structure of the slope protection by spraying the guest soil on the slope puts forward reasonable suggestions.