Numerical Analysis Of Structure Seismic Performance After Goaf Disposal

The rapid development of China’s urbanization in the past years, due to the problem of land-use, many mining area structures buildings in goaf area on the ground after disposal, but the builtings not well to consider the impact of earthquakes and other geological disasters; Once geological disasters such as earthquakes occur, immeasurable loss especially in mining area. Therefore, in numerical analysis after goaf disposal structural seismic response of mine area safety, disaster prevention and relief and economically, has important economic and social significance.This paper based on the characteristics of different types of structures, performance analysis and comparison on the significance of having a typical point- Xinan home district after goaf disposal the Building 5, using the finite element dynamic analysis of LS-DYNA software for numerical analysis. And having a further research before goaf disposal of the economic response situation. The main results of this research are as follows:(1) Stress is concentrated in the largest room, pillar and floor joints, corner points, from the upper to the lower layer, gradually increases, that the underlying value of the maximum stress in the cylinder.(2) Different peak ground accelerations in different directions and the maximum effective stress law buildings bottom of the column: When the earthquake peak acceleration increases, effective stress research point of an increasing trend; comparing the case of the same peak accelerations in different directions of the effective load stress shows: effective stress in the z direction, x direction, xz45° direction is gradually increased, indicating the influence of xz45° direction seismic waves of the largest buildings; the long side of the effective stress in the column is greater than the stress in the short side of the column as a whole, by affecting the magnitude and direction of change of the seismic load is also greater.(3) Buildings in Mining area generally use the lower part of the C35 or C40 concrete, its strength 23.4 ~ 26.8MPa. Therefore, the earthquake peak acceleration of 0.30 g, the maximum effective stress numerical analysis obtained in 25.3 ~ 29.2MPa, at this time that the houses have been destroyed or are in a critical state.(4) Different peak ground acceleration and laws in different directions building foundation center, at the corner of the vertical displacement sizes: When the earthquake peak acceleration increases, the vertical displacement of the study sites have a tendency to increase; at the same earthquake peak under acceleration, the vertical displacement of the center of the base than at the corner of a small displacement; and the case load of different directions, vertical displacement expressed as: x direction, xz45° direction, the z direction is gradually increased, indicating the z direction seismic waves on the basis of the largest settlement of the foundations of buildings.(5) Seismic response laws of the goaf as follows: Peak acceleration under different circumstances, goaf response to load increases with increasing load; former goaf processing seismic load y direction of its effective stress and effective strain in response to a greater degree of stress on x, z direction is less than the y direction; the impact of earthquakes on the mined-out area load displacement is relatively small.