Room And Pillar Method To Pressure The Structural Parameters Of Processing And Human Mining Column

This essay mainly researched on the rock pressure in the room-and-pillar mining and determined the structure parameters of stope in the method of the artificial pillar insteaded of ore pillar.Its main content is as follows:(1) The ore body occurrence condition,goaf distribution characteristics and structural plane characteristics were mastered by means of detailedly in-situ geological investigation and goaf statistics.Based on comprehensive evaluation method of the ground pressure situation of goafs,the goaf's stability is synthesized evaluate.Combined with on-site roof displacement,stress and rock mass failure of pillar and other acoustic emission monitoring results,the goaf's underground pressure was analysed.(2) By means of a 3-dimensional numerical model,it could simulate the stability of caved areas after different level ore has been mined. The results show that the grisliness underground pressure would be caused under continuous mining. In order to ensure the safety,the method of using back filling was proposed to improve the stress. The optimal filling area was obtained by considering the cost and effects.(3) Combining with the result of deformation monitoring for the room-and-pillar mining and studying on the mechanical bearing mechanism of cemented backfill,it was drawn the conclusion that the load on each artificial pillar included two parts,one is the weight of plastic zone which caused by excavation,the other is the weight of artificial pillar. According to the stope's roof rock failure mechanism,the stope structural parameters was is obtained by the Bieniawski formula for pillar strength theory.(4) Surrounding rock stability was simulated in the deep orebody by using the finite difference software FLAC-3D,it would verify further if the stope structure parameters were reasonable.(5) Using the cusp catastrophe theory,the stability criterion with regard to the failure of artificial pillar was obtained,the release of energy and variant of deformation would be acquired when the system occurred unstable failure.