The Study On The Stability Of Goaf Under The Buildings In Xikuangshan And The Recovery Technology Of Residual Ore

There are many important buildings in the ground surface of Xikuangshan antimony ore district, such as school, workshop and resident buildings. So underground mining which may produce big ground pressure is not allowed to protect the surface buildings from destroy. Besides, there are large amount of goaf near the earth's surface. The ground subside has been arosed by the goaf and the surface buildings has been destroyed badly. So the study on the stability of goaf under the buildings in xikuangshan and the recovery remnant ore is essential.In the paper,the following contents are included:(1)Through the scene geologic investigation,the collection of the mine geological data,the engineering geological condition and hydrogeological condition of ore district are grasped. The distributed condition of the goaf and the distributed condition of surface buildings has been gained by analysis.(2) The physical and mechanical parameters of rocks has been gained through the parametric experiment.(3) The 3D elastic-plasticity finite element models are builded to simulate the stabilization of the goaf wall rock and the foundation of the buildings on ground surface. The results show that the goaf is likely to been destructed. Bring forward how to treatment the present goaf.(4) The recovery technology of residual ore are bringed forward, and the 3D finite element software is utilized to simulate the mining technology to obtain rational structural parameters of stope and mining technic.When adopting the upward level tail cemented back-filling mining method, first stoping the pillar and filling with cemented body , second step stoping the mine room and filling with tail. The width of the pillar is 8 m and the width of the mine room is 12 m.The lamination height is 2.5-3 m, the largest height is10 m.The research project bring forward security, economic and technical reasonable options for recovery remnant ore and the disposal of goafs of the xikuangshan ore area. This can provide information for other metal mines which has goaf under the buildings.