Study On Reinforcement And Stabilityof Highway High Slope Of Broken Accumulation Body In High Intensity Earthquake Region Of West Yunnan

Slope stability is closely related to the safety of the surrounding environment,and slope instability is a serious geological disaster that can cause serious consequences,so it needs to be treated carefully.Based on an example of a slope project in Lamping County,the paper uses two different finite element software to calculate and analyze the stability of the slope and propose reinforcement measures.Subsequently,numerical simulation software was used to study and analyze the stability,seepage field,displacement field and stress field of the reinforced slope under natural conditions,rainfall conditions and earthquake conditions,and model tests were conducted to simulate the reinforced slope under various rainfall conditions and to study and analyze the pore water pressure,soil pressure changes and slope deformation.Work done and results obtained.(1)Based on the engineering geological survey data,the characteristics of stratigraphic lithology,geological structure and seismic,hydrogeological and engineering geology of the slope area were identified,and the causes and mechanisms of slope deformation and instability were also explained.(2)The two-and three-dimensional finite element stability calculations of the slope under natural working conditions were carried out and a reasonable reinforcement plan was proposed,and then the calculation and analysis of the reinforced slope under natural working conditions were carried out.The results show that after reinforcement,the slope changes from the previous unstable state to the stable state.(3)Based on the theory of saturated-unsaturated soil infiltration,the two-and three-dimensional finite element calculations of seepage field,stress field and stability of the reinforced slope under rainfall conditions were carried out.The conclusions are as follows: if the rainfall time is extended or the rainfall intensity is increased,the slope pore water pressure value,total head value,water content and vertical stress of the slope are increased,but it will have a weakening effect on the slope stability.The minimum safety factor still meets the stability requirements of slope under rainfall conditions in the specification.(4)Numerical simulation of the reinforced slope was carried out from two-dimensional and three-dimensional perspectives according to the time course analysis method,and the minimum safety coefficient and response results of the slope under the seismic action were obtained.The results show that the reinforced slope is not destabilized under the earthquake conditions.(5)Model tests were adopted to simulate the reinforced slope under various rainfall conditions,and the results of pore water pressure and earth pressure at each measurement point were obtained and compared with the numerical simulation results,and the deformation development characteristics of the slope were also observed and analyzed.The conclusions are as follows: the pore water pressure and soil pressure results obtained from the model test and the results obtained from the numerical simulation are approximately the same in terms of the way they change with time.The greater the intensity of simulated rainfall,the faster the development of cracks in the model slope,the faster the slide body is wetted,and the faster the overall landslide occurs.