Research On Optimization Design Method Of Earthquake-stricken Railway Route Reconstruction Scheme

With the continuous improvement of China ’s road network,the operating mileage of the western railway is increasing,and various geological disasters will inevitably be encountered in the process of railway construction and operation.Among them,the earthquake disaster will cause serious line deformation and threaten the safety of driving.Some serious earthquake disasters will cause the line to be abandoned,and the problem of re-selecting a suitable line direction plan is re-selected.Therefore,how to correctly use the main technical standards related to line design and complete the repair or reconstruction scheme design of earthquake-stricken lines at a small cost has become an important research topic.Based on the typical cases in the operation process of the western railway,this paper studies the optimization design method of the relevant reconstruction scheme,and analyzes the dynamic response of the design scheme.The main work is as follows :(1)The optimal design method of line repair scheme considering specification constraints is studied.This paper mainly combines the post-earthquake line dislocation problem of Daliang tunnel in the operation process of Lanzhou-Xinjiang passenger dedicated line and the large deformation problem of Zhangjiazhuang tunnel crossing Gaojiawan landslide body.Taking the minimum engineering quantity as the objective function and the design requirements of the horizontal and vertical sections of the line in the specification as the constraint conditions,the general calculation model of the repair and reconstruction of the earthquake disaster line scheme is constructed.The optimal design schemes of the dislocation line repair and the new bypass Gaojiawan landslide body in Daliang tunnel section are sought respectively,and the recommended optimal design schemes to meet the requirements of the specification are given respectively.(2)The evaluation method of dynamic performance index based on vehicle dynamics is studied.Because some indexes in the line design of the earthquake-stricken line repair scheme adopt the limit value of the difficult conditions in the specification,it may affect the dynamic performance of the train operation.Therefore,based on SIMPACK,the vehicle-line coupling dynamic model of three-vehicle linkage is established,and the safety and stability evaluation of the preliminary design scheme and optimization scheme of Daliang Tunnel and Zhangjiazhuang Tunnel are carried out.The rationality of the design scheme is evaluated from the aspects of safety and stability of vehicle operation.(3)The optimal evaluation method of two-dimensional cloud model route scheme based on combination weighting is studied.In order to carry out the optimization analysis of the design route more objectively,a multi-objective hierarchical analysis model of route scheme optimization combined with vehicle dynamics index is constructed.The subjective and objective weights are obtained by using the improved AHP and CRITIC method,and the subjective and objective weights are coordinated into combined weights by combining the game theory combination weighting method.A two-dimensional cloud model of route safety and comfort is created.Combined with MATLAB programming and two-dimensional forward cloud generator,a comprehensive cloud map of the first-level index and safety and comfort is obtained.The different design schemes of dislocation line repair and new bypass Gaojiawan landslide in Daliang tunnel section are compared and analyzed.Verify the rationality of the optimization scheme.