Analysis Of Slope Stability Of Yanru Expressway And Optimization Design Of Bolt-Slope Protection Parameters

Taking the unstable slope body on the right side of LK0+200~300 of Yanru Expressway as the research object,the possibility of instability and activation of slope engineering is analyzed by the methods of on-site exploration,indoor experiment and numerical simulation.Slope failure characteristics The slope treatment plan was proposed and the numerical simulation and parameter optimization of the slope-slope protection scheme for bolted-sloped slope support design were provided to provide reference for the treatment of the unstable slope of the Yanru Expressway section.The specific research contents are as follows:(1)On-site exploration and rock mechanics experiments.Field surveys,on-site measurements,and core sampling were conducted on the slopes.In-situ tests and laboratory experiments on rock and soil were conducted to obtain the mechanical parameters of each rock and soil layer.The landslide cracks are classified and the failure forms and causes of slope landslides are analyzed.(2)Analysis of the possibility of unstable activation of slope engineering.Unbalanced thrust method is used to calculate the stability and stability of the destabilized slope.According to the characteristics of slope failure,taking into account the environmental conditions of the project,a slope-remediation scheme supported by combination of anchor and cut slope is proposed.(3)Slope treatment plan parameters optimization design.According to the preliminary design scheme for slope treatment,a numerical simulation experiment scheme for bolt-slope support parameters was formulated,and a numerical simulation model for each scheme was established to analyze the stability.With the goal of minimizing the cost of governance,the safety factor meeting the regulatory requirements is the constraint,and the optimal solution is determined through the comparison of alternatives.The research results show that:(1)The safety factor of unstable slope is 1.0,which is in an under-stable state,and the slope is in an unstable state under rainfall conditions.(2)Optimized supporting parameters: the length of the bolt is 9.5m,and the slope of the graded slope is 44°,which can provide guidance for the management of the unstable slope of the Yanru Expressway.