Dynamic Effect on the Ground Surface above the Mine Goaf Caused by an Earthquake

摘要

More than half of the area is distributed in the seismic intensity 7 or even higher one in China.Earthquake will cause considerable damage to the high seismic intensity zone where Chinese coal mines are mostly located.Recently,large areas of mined-out spaces formed in the strata of mining areas have been increased,because of large-scale coal mining exploitation.Some buildings are built in the mining areas where goaf exist underground.The seismic response on the ground surface will be affected by goafs when earthquake happens.Therefore,it is of great significance to study the seismic response on the ground surface above goafs in mining districts.In present study,the seismic response on the ground surface above the goaf has been simulated by and analyzed by FLAC3D models for various conditions.The seismic response at the monitoring points on the ground surface has been analyzed for different layout manner and size conditions of the goafs.The conclusions will give reference for the study of seismic response on the ground surface above the mine goafs.