Stability Analysis And Prevention Measures Of Plateau Highway Slope Based On MIDAS GTS NX

In the construction and operation of highway projects,the stability of the slope has an important impact on the safe passage of highways,human life and property,and economic development.For hundreds of years,a lot of energy has been invested in slope stability analysis and slope treatment technology research at home and abroad,and certain results have been achieved.However,there are relatively few studies on slope stability analysis and reinforcement treatment in plateau areas,and in the actual highway engineering construction,due to insufficient geological survey,insufficient influencing factors considered in stability analysis,and unreasonable protection design,etc.,the damage of the supporting structure and slope instability occur during the construction of the highway slope or in the later operation process,which not only causes damage to the infrastructure in the region and affects the social economy,but also endangers the lives of local residents and drivers.Secondly,in the construction of highway engineering in China,when encountering the problem of slope stability,although the limit balance method is a method often used in most specifications recommended,stipulated or often used in actual engineering,the method makes many assumptions and simplifications in the stability analysis and calculation,treats the studied soil and rock mass as a rigid body,ignores the stress and deformation ofThe rock and soil mass itself,which will cause certain errors to the analysis results,and the finite element method relies on its own powerful numerical analysis method.When solving the stability problem of slope,it can not only intuitively analyze the most dangerous sliding surface of highway slope and landslide body and simulate the whole process of slope instability failure,but also accurately find the stress-strain magnitude of landslide body,the advantage of this method is that it can well meet and make up for the shortcomings that cannot be met by the limit balance method,and provide an effective governance basis for highway slope reinforcement and treatment.Therefore,relying on a highway slope treatment project in Tibet,this paper analyzes the slope stability based on the limit equilibrium method and the MIDAS GTS NX finite element strength reduction method based on the research results of predecessors,and compares the results of the traditional analysis method and the numerical analysis method to verify the applicability of the traditional analysis method in the stability analysis of highway slope in Tibet,and then uses the MIDAS GTS NX finite element numerical simulation analysis software to evaluate the stability of the slope under normal working conditions and non-normal working conditions.Finally,the simulated unstable parts are reinforced and the landslide treatment project after treatment is simulated to verify the rationality of the treatment plan,and provide a reference for the protection and treatment of similar highway slopes in Tibet.The main research contents and conclusions are as follows:(1)Through the analysis and summary of engineering geological survey data,the overall stability and future slippage trend of the slope were qualitatively analyzed.(2)The limit equilibrium method and the MIDAS GTS NX finite element strength reduction method were used to establish 2D and3 D slope models,and the slopes before treatment were quantitatively analyzed and calculated under normal working conditions and abnormal working conditions,and the calculation results of the two analysis methods were compared and verified.According to the results of traditional analysis methods and numerical simulations,the influence of abnormal working conditions on the overall stability of the slope in the study area is relatively large,and if it is not reinforced in time,landslides may occur under rainfall.(3)With the help of the MIDAS GTS NX finite element numerical simulation software,the optimal arrangement scheme of anti-slip piles(anti-slip pile 2’)was determined from the analysis of anti-slip piles at different positions from the overall displacement,plastic strain and safety factor of the slope.Then,the stability analysis of the typical slope after treatment under the most unfavorable conditions(heavy rainfall conditions)finally obtains that the overall displacement of the highway slope decreases under the treatment of anti-slip pile 2’,the safety factor increases,and under the most unfavorable situation,the slope is still in a stable state,which proves that the slope of this section has been effectively treated.