Study On Stability Of High-steep Bedding Weathered Rock Slope Under Heavy Rainfall

With the rapid development of the national economy,the development and operation of a large number of roads,railways,and mining projects built or being built are faced with the problem of slope stability.In particular,the landslide caused by the high steep slope induced by heavy rainfall has made a great threat to the construction and safe operation.Therefore,it is of great significance to study the influence of heavy rainfall on the stability of the slope.This thesis is based on the project Guangming highway,using similarity analysis,the model experiment and numerical simulation,to study the failure modes and the displacement of the slope trend,and provide analysis data and the verification method for existent slope monitoring system.The main information of this paper has the following aspects:(1)Analyzed the trigger factors of rock slope deformation,and classified the damage models.Based on the analysis of seepage mechanics characteristics of rock slope,we are trying to discuss the penetration of the rock and the seepage force on the hole wall cracks,giving the practical algorithm along the rock slope stability coefficient of fractured under the action of the heavy rainfall.(2)With Sitting Guangming high speed K66 segment prototype as the engineering background,and basing on similarity analysis,we obtained the ratio of similar materials through orthogonal test in weathered rock.An indoor model test system was established under the condition of heavy rainfall,and the real-time displacement of the slope was monitored by the micro dynamic measurement system based on digital image.(3)A comparative experiment was carried out on the similar slope test models to study with different layered angles and different proportions,damage mode and the rule of displacement with time.The results shows that the slope destruction from the middle of the slope,the displacement change forms a D shape to P shaped or R shaped,single point displacement tends to parabolic shape;layered angle is not conducive to increasing the stability of the slope,and increasing the proportion has little reaction to the model of slope displacement change.4)Using ANSYS/LS-DYNA software,the slope model corresponding to the test iwas established,and the displacement and deformation process of the slope are analyzed under the condition of heavy rainfall.The comparison between numerical analysis and experimental data shows that the changes of displacement and failure form are basically consistent with the two methods.The effectiveness of the micro dynamic monitoring system to predict thestability of the slope is verifi.