Study On Dynamic Load Of Expressway Rock Slope Collapse And Rockfall Prevention Measures Analysis

The Zhang Cheng Expressway Dahua mountain tunnel north exit at high steep rock slope as the research object, through on-site reconnaissance terrain appearance of the physical characteristics and topography analysis, analysis of the high steep rock slope in highway geometry data, survey of high steep rock slope in the main joint development and formation lithology characteristics, through access to relevant documents and field investigation to obtain slope hazards of vehicle travel data, vehicle size characteristics and seismic data. Using UDEC of highway rock slope under dynamic load of collapse mechanism and the rolling stones protective measures, analysis of the main research contents are as follows:(1) The influence factors of absorb and learn the high rock slope under dynamic load of collapse at home and abroad, summarizes the influence factors of collapse.(2) Using UDEC software, the establishment of highway rock slope model, in under the action of gravity, the slope of the displacement field and stress field analysis; analysis in seismic slope collapse velocity field, slope collapse after the displacement field, stress field and plastic shear strain situation, seismic loading is studied under the high rock slope collapse loss of failure mechanism. Recording and analysis of trajectories, slope collapse of rock displacement and velocity.(3) After analysis of each vehicle dynamic characteristics and vehicle dynamic load mathematical model, using a half sine pulse load to approximate the dynamic model of vehicle load, the highway rock slope model is established, using discrete element UDEC software, in under the action of gravity, the slope of the displacement field and stress field analysis; in the long-term vehicle loading slope displacement field, stress field and plastic shear strain and unit damage, long-term studies under vehicle loads of rock high slope stability situation analysis.(4) The discrete element simulation software UDEC, recording and analysis of rock high slope collapse stones falling trajectory, displacement and velocity analysis of rolling stone collision stopped before and after Stonewall speed and time difference, the iMPact force is calculated by the law of conservation of momentum, the retaining wall is simplified as a continuous beam, the use of structural mechanics to calculate continuous girder support reaction.