Study On Stability Of Cutting Slope Of Jiangmei Highway(Hanzhong Section)

Rock and soil body is a complex structural material,which has the characteristics of heterogeneity,anisotropy,rheology,and significant influence by the external environment(water,temperature,wind,etc.).Especially the cutting slopes of provincial highways are particularly sensitive to the impact of heavy vehicle vibration.With the completion of the service period of the highway,the stability of the highway slope during the operation period continues to decline,resulting in various types of deformation and destruction,affecting highway safety.This paper takes the cutting slope along the Jiangmei Highway(Hanzhong Section)as the research object,and stabilizes the cutting slope along the Jiangmei Highway(Hanzhong Section)during the operation period by means of data collection,field investigation,field test,theoretical analysis and numerical simulation.The research has been carried out and the following research results have been achieved:(1)The study obtained the deformation type,characteristics and influencing factors of the slope during the operation period of Jiangmei Highway(Hanzhong Section).Through on-site investigations,the types of deformation and failure of the cutting slope of Jiangmei Highway(Hanzhong Section)are mainly collapse,rockfall,bedding sliding,and wedge sliding.The factors affecting its stability are slope height,slope,bedrock lithology,rainfall Quantity,operating time,vehicle vibration.Through analysis and statistics,the two main factors affecting the stability of the slope along the Jiangmei Highway(Hanzhong Section)are operating time and vehicle vibration.(2)The study obtained the law of attenuation of slope acceleration caused by truck vibration.Through field tests,the spatial attenuation law of vehicle vibration acceleration along the cutting slope of Jiangmei Highway(Hanzhong Section)under vehicle dynamic load was obtained;and the slope body along Jiangmei Highway(Hanzhong Section)caused by vehicle vibration was obtained by Fourier transform Of the spectrum change.(3)The study obtained the slope damage attenuation law and stability calculation method based on dynamic loading conditions.Taking the vibration acceleration as the damage variable,the concept of average damage degree was proposed,and the spatial model of acceleration attenuation was established,and the attenuation law of the average damage degree with the spatial distance of the slope body was obtained.Considering the damage evolution law of rock mass structure under dynamic load of vehicle,a calculation method of slope stability coefficient considering vehicle vibration damage was established,and the slope stability coefficient at different vibration times was obtained in combination with LB 14 case.(4)The study obtained the creep law of the cutting slope of Jiangmei Highway(Hanzhong Section).Considering the time effect of the slope,with the help of FLAC 3D finite element software,the maximum displacement and the maximum shear strain increment of the slope body under different slope height,slope angle and creep time were obtained.On this basis,with the help of the ones function self-built script in MATLAB,the unary cubic expressions of maximum displacement and maximum shear strain increment considering slope height,slope angle and creep time were established.This study is conducive to the evaluation of the instability of the slope body along the Jiangmei Highway(Hanzhong Section),and can also provide a reference for the stability study of similar slope bodies during the operation period in Hanzhong area.