| This paper takes the slope remediation of a railroad line in Gansu Province as the background,and innovatively designs a pre-stressed anchor shaped pier structure to manage the road landslide beside the railroad line,while ensuring that the original road beside the railroad line continues to pass.The unstable slope next to the railway line is excavated,the sandstone layer under the loess layer of the slope is blasted,the lower part of the shaped pier is embedded in the sandstone,and then the prefabricated plate beam is laid on the upper part of the cover beam of the shaped pier.On the one hand,the structure can replace the original damaged road to continue to pass;on the other hand,the structure supports the slope where the railway line is located and solves the road landslide problem.The structure and the prestressed anchor cable joint support,combining the advantages of both in one,and the force is more reasonable,in actual use,not only can give full play to the performance of each structure,but also can save costs.In this paper,with the help of finite element analysis software ANSYS,the internal force and displacement of the shaped pier with prestressed anchor cable are analyzed in depth,and through the optimization of sensitive parameters such as shaped pier spacing,embedment depth,anchorage angle of prestressed anchor cable,anchorage depth and prestress size,the pier,anchor cable and slope are finally made to produce the minimum displacement or bring into play the maximum stability of the slope with the use of the most optimized parameters,and the main research work The main research works are as follows:(1)According to the principle of material similarity,a shrinkage model of the shaped pier was produced,and through static loading tests on the shrinkage model,the force characteristics,static performance and deformation law within the linear elastic phase of the shaped pier in the tension zone and dangerous cross-section under static loading conditions were studied and compared with the finite element simulation results,so as to verify the structural rationality of the shaped pier and derive the force and deformation law of the structure.(2)Theoretical calculation of the load and landslide thrust on the shaped pier structure according to the relevant codes and theories,so as to prepare for the numerical simulation.Establish the finite element principal structure model suitable for the actual situation of the structure,and determine the material parameters and boundary conditions of the finite element model.(3)Analyze and study the sensitive factors affecting the force and deformation of the shaped pier.The three-dimensional solid finite element model was established by Workbench,and single-factor analysis was conducted on parameters such as pier spacing,embedment depth,anchor cable anchorage angle,anchorage section length and anchor cable pre-stress of the shaped pier respectively to study the influence of different parameter changes on the force and deformation of the shaped pier and the effect on slope support,and finally the best design parameters of the shaped pier with pre-stressed anchor cable were obtained to provide some reference for the application of engineering practice.(4)To carry out the design of shaped pier(4)Numerical simulation of seismic performance of profiled piers with optimal design parameters was carried out.By applying transverse and longitudinal seismic accelerations to the shaped pier and slope model,the force and deformation of the structure under seismic action and the effect of the shaped pier on slope support under seismic action are obtained by using the time course analysis method. |
