Study On Dynamic Response And Slope Stability Of Cutting Rock Slope Of High-speed Railway

With the development of railway modernization, it is necessary to advance high-speed and heavy-load railway transportation. Raising train-running speed and increasing train-hauling load will necessarily increase train vibration force, the effect of train-running on environmental vibration has become a hot issue among insiders. High-speed railway rock slope in complex geological environment will long be influenced by high-speed railway vibration load. Therefore in engineering practices of slope treatment,design and stability analysis,how to consider the effect of train vibration load has become an important question of building high-speed railway in mountain. In the thesis, based on summarizing and absorbing the research achievements of the pioneer works in trak system caculating model, train vibration load model and railway environmental vibration response, by the method such as theory analysis, field test, numerical value simulution,the dynamic response and slope stability of railway rock slope under high-speed train vibration load is studied, and mian research work of dissertation can be summarized as folows:1.The character of railway rock slope, the basic methods of slope stability analysis and the effect factors of railway rock slope stability are analyzed. Based on the research achievements of the pioneer works, how to establish the geological model, failure model and mathematical-mechanics model in slope stability analysis is studied.2.By analyzing and comparing the non-linear-elasticity and elastic-plastic consttutive model of rock mass, the thesis made up elastic-plastic constitutive model of slope rock mass for FEM numerical caculating. According to the research achievements of rock dynamic properties and rock mechanics test, the dynamic elastic-plastic constitutive model of slope rock mass is studied.3.By analyzing and evaluating track structure model and locomotive-vehicle model, the general principel for estiblishing vehicel-track coupling system model is proposed, and the basic characteristics of vehicel-track vertical coupling dynamic analysis model is studied. According to the vehicel-track structure characteristics of Qin-Shen Special Railway Line, the vehicel-track vertical coupling dynamic analysis model with second hysteretic hanging is established, and by using D'Alembert principle, the vibration differentical equations for the vehicle/track system is created. Based on vehicel-trackvertical coupling dynamic analysis model and numerical integration methods for vibration differentical equations, the vehicel-track dynamic analysis program is compiled.4.By using vehicel-track dynamic analysis caculating program, vehicel-track interaction dynamic response under random track irregularities excitation is caculated, and the numerical calculating results is compared with the field test data, the analysis show that the vehicel-track vertical coupling dynamic analysis model is efficient.5.By using vibration inverse analysis theory and FEM, the dynamic finite element inverse analysis method for determining the vertical vibration-loading history of high-speed railways is proposed. According to the characteristics of high-speed railway vibration load, the high-speed train vertical vibration load caculating model is estiblished. By comparing numerical calculating results with the field test data of Qin-Shen Special Railway Line, the efficiency of the dynamic inverse FEM model for caculating high-speed vertical vibration-load is showed.6.Based on high-speed railway vibration-load caculating model and dynamic inverse FEM caculating method, the caculating program is compiled. By using vibration-acceleration history of the field measurement and chosing properly model parameters, the train vertical vibration-loading history curves of Qin-Shen Special Railway Line caused by different train-speed were calculated. The results are helpful for the dynamic response analysis of subgrade and environment under high-speed railways vibration loads.7.Based on train vertical vibration-load model,elastic-plastic constitutive model of slope rock mass and rock slope system caculating model, by analyzing and comparing numerical caculating methods,the dynamic FEM analysis program is compiled, the rock slope dynamis reponse and slope stability is studied.The results are helpful for the design and strengthening for high-speelrailway rock slope.