Study On Control And Evaluation Technology Of Stability Of Highway Cutting Slope

In recent years,along with large-scale renovation of the highway network,a large number of slope engineering geological disasters constantly emerging.According to the related investigation,the instability rate of the cutting slope is very high during the excavation and operation phases,which has greatly damaged the life and property safety of the public along the highway.The factors affecting the stability of cutting slope stability and stability evaluation methods are varied,how to accurately determine the impact of cutting slope stability of the key factors,how to make an accurate evaluation of the stability of the cutting slope,and cut slope stability is a difficult problem in slope engineering research.In this paper,based on summarizing the control technology and evaluation methods of highway cutting slope stability at home and abroad and the characteristics of deformation and failure of highway cutting slope in Hebei Province,this paper takes K58+743.46~K58+963.46 of TJ17 section of Hebei Chengzhang Expressway The stability of the cutting slope is analyzed by Plaxis software,and the control model and evaluation model of the stability of the cutting slope are established.The stability of the cutting slope is analyzed by using the finite element strength reduction method.Put forward the idea of cutting slope stability control process,combined with the monitoring results are given reinforcement treatment program,the main research contents and achievements include:(1)Summarizes the relevant characteristics and the specific classification methods of highway cutting slope,and expounds the characteristics of deformation and failure of rock and soil cutting slope.(2)Based on the strength reduction method,the influence of different internal factors on the stability of highway cutting slope is studied and analyzed,and the influence of various mechanical parameters on the stability of cutting slope is deduced by the method of gray relational analysis.If the increment of water cut is consistent,the softening rate of water is not consistent with the friction angle and the cohesion of rock and soil strength parameters,and for some individual soils,the disparity between the two is still great.(3)The model of process stability control and evaluation of cutting slope is established by using Plaxis software.The influence of the different construction sequence on the stability of cutting slope is analyzed.The safety coefficient of cutting slope during excavation is the process variable closely related to the sequence of the process.The more the support measures are applied in time,the smaller the total deformation of the slope will be,the smaller the area of stress relaxation will be,the deeper the surface displacement of the potential slip formed within the slope is,the higher the stability of cutting slope will be,the application of prestressed bolt support measures can achieve the most effective reduction of the total deformation of the slope and stress relaxation area.(4)The deep displacement information of the subjects was monitored,based on the monitoring results,the management scheme of slope displacement unloading + anchor frame beam reinforcement + skeleton plant slope protection was put forward.