Mined-out Area Reserved Pillar And Filling Position Optimization Theory And Engineering Application

The goaf leaved after mining at the underground mine threaten mine safety. Therefore effective treatment must carry on it. Optimal supporting position of pillar of single goaf and filling position of complex goafs are mainly researched in this paper. And the result used in the engineering practice. Also the research result has provided with reference to the similar mine. Mainly research content and the results in this paper are as follows:First, the inner link of the energy dissipation, energy release, rock strength and the overall destruction in the process of rock deformation are analyzed. The optimization method of minimum deformation energy of single goaf reserved pillar is confirmed based on the overall destruction of rock is controlled by release strain energy and combined with the minimum deformation principle. Namely, destruction energy of surrounding rock-pillar system is smaller, reserved pillar position is more beautiful.Second, simulating to the goaf under the rock character of surrounding rock is consistent and not consistent situation. Simulation results show that:when the goaf surrounding rock-rock character is consistent, the optimal reserved pillar position ensured by maximum displacement value of roof node consists with optimal pillar position ensured by minimum deformation energy. However, when the surrounding rock-rock character is not consistent, relying on the maximal displacement only evaluates the stability of part area roof, can not evaluate the overall stability of goaf, and investigating size of the system deformation energy can effectively evaluate the stability of overall goaf, so get reserved pillar position is better. Further, the minimum deformation energy corresponding to optimal reserved pillar position method is validated, namely, the minimum deformation energy, reserved position of the pillar is best.Third, based on the method of pillar position determined by the above deformation energy, under the different middles of goaf reserve pillar at yueyang gold situation, the system’s overall deformation energy is computed by numerical simulation. Analyzed the94m the middle pillar, getting that it plays a key role to maintain stability of whole goaf, should stay for permanent pillar. In addition, the similar simulation results show that:when the94m the middle suffers maximum horizontal stress and the overlying load increases in the middle of the roof, this middle first appears destruction.Fourth, to complex goaf group, first, improved the effect factors of goaf stability coefficient which based on the relationship of matrix and the fuzzy mathematics and also joined the other goafs effects on researching goaf, therefore, the result is more suitable for the static stability analysis of goaf; second, calculated safety coefficient of goaf which based on goaf strength and average stress and got the stress increment which used the monitoring data; finally, established the fuzzy reasoning system based on the deal plan of goaf group which fuses stability coefficient, pillar safety coefficient and stress increment of goaf which belongs to complex goaf group. Using the above methods on the complex of treatment engineering of YuYang silver obtained stability coefficient, the safety factor of monitoring pillar and stress increment of each goaf and got processing coefficient of each goaf which uses the fuzzy reasoning system based on the deal plan of goaf group. Finally, processing methods of each goaf are ensured.