Slope Stability Analysis And Prevention Measures Of Wangce Highway In Guizhou Province

Due to the limited investment cost of ordinary highway,many sections have not been fully investigated,and some slope prevention measures are not in place.Slope instability often occurs after a period of time after completion.Serious may cause economic losses and casualties,but also increase the cost of highway maintenance.This paper takes wangce highway slope in Guizhou Province as the research object,A subgrade slope in the study area is selected,and the stability of subgrade slope under different working conditions is analyzed by transfer coefficient method and numerical simulation;Finally,three different kinds of protection are used to simulate the support of the subgrade slope,and the protection effect is analyzed through the stress situation,displacement change and safety factor of the slope,The conclusions are as follows:(1)The overburden along wangce highway is mainly quaternary eluvium with gravel clay,and the surface is mostly cultivated soil,alluvial proluvial sand pebble soil;The underlying rock is mudstone;The main failure mode of slope is sliding failure,and the forms of collapse and slope erosion coexist.Rainfall is the main influencing factor of slope sliding.(2)For the selected subgrade slope in the study area,the transfer coefficient method and numerical simulation are in a stable state under natural conditions,but in the rainstorm condition,the slope is in an unstable state,mainly due to the increase of the self weight stress of the slope caused by the rain,resulting in the increase of the sliding force,and the rain is the main reason for the instability of the subgrade slope.The deformation of the slope body is mainly distributed in the filling soil layer of the slope body,and the maximum displacement appears at the top of the slope and the slope position,and the displacement of the top of the slope is more consistent with the actual pavement crack position.(3)The stability of the slope after support is analyzed from displacement,stress state,shear strain increment,plastic area distribution and safety coefficient.The deformation of the slope after support is much smaller than that of the unsupported slope,which is reduced from cm to mm.The plastic zone has no through zone and the stability of the sliding body is good.The results of the three supporting measures are: bolt + anti slide pile > anti slide pile > anchor rod.(4)The main influencing factor of anti slide pile construction quality control is the human factor,and the important link is the process supervision.There are traditional and non-destructive testing methods for anchor rod.The non-destructive testing method mainly uses stress wave reflection method.