| According to the case of a mining area,the data are collected and analyzed.The seismic liquefaction effect of rock and soil is simulated by numerical simulation software,and the accurate structural model is established.The failure mechanism of the structure under different dynamic parameters is explored by calculation results.It also provides a simplified analysis method for simulating the interaction between mine structure and soil in this case.Through the study on the failure mechanism of mine shaft structure,it can provide reference for seismic reinforcement and design of mine structure in seismic liquefaction area and provide theoretical help for seismic research of similar structures.The main contents of this thesis include:1.Based on the case study,the hydrological conditions,soil properties and basic mechanical indexes of the site are analyzed,and the formation mechanism of large deformation of seismic liquefaction of the site is explored by using the factors such as amplitude and direction of ground motion,and the influence law of dynamic response and failure of coal mine shafts.2.Through numerical simulation to explore the dynamic response of site soil before and after large deformation under different influencing factors.Considering the watersoil coupling effect and the nonlinear interaction between soil and coal mine shaft,PLAXIS 3D software was used to establish the numerical simulation model of seismic interaction between liquefied site and coal mine shaft structure affected by large deformation of site liquefaction.3.Based on the numerical simulation test,the evolution and development law of plastic zone of coal mine shaft land under different influencing factors and the distribution location,failure location and failure characteristics of plastic zone of coal mine shaft under earthquake are clarified.A suitable simplified analysis method is proposed to reveal the failure mechanism of coal mine shaft caused by large deformation of seismic liquefaction of site land. |
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