Study On Safety Control To Mining Under Large Scale Hidden Trouble Zone

To mining under the large scale hidden trouble zone in the Tongkeng Mine, in the paper, the safety mining technology is systemical studied. To the large scale hidden trouble, the safety problems and the influencing factors of safety mining are analyzed. The safety and management of the ground pressure are studied. The ideas of mining are proposed to the inducation caving roof based on the succeeding mining under the large scale hidden trouble zone. The hazards of mammoth blasting are forecasted by the empirical equation. At the same time, the thermal environment and ventilation are numerical simulated by the soft, and then the control measures are put forward by the simulated results. The results show that the safe conditions are improved and the resource recovery rates are heightened under the large scale hidden trouble zone.(1) To mine of hidden trouble resource in the Tongkeng Mine of Huaxi Co., the mechanic model are built and analyzed by the FEM to the safety thickness of the roof. The safety thichness are forecasted by the nonlinear theory, such as nonlinear multivariant regression and neural network. Based on the RFPA soft, the time-varying mechanic model of the caving roof is bulit by inducation of mining, the effecting of time-varying is analyzed to inducation caving roof in the succeeding mining.(2) To handle the roof of the empty, the inducation caving roof is proposed under the hidden trouble zone based on the successing mining. The technology of the inducation caving roof, which is that the part of the middle roof is collapsed by forced blast and the both side roof are presplitted by the presplitting blast. The reasonable time is confirmed by the FEM simulation to inducation caving roof. At the same time, the schemes of the induced blast are designed in the paper, include the order and the parameters of inducation caving roof.(3) The hazards degree of mammoth blasting are forecasted under the enviorment of the hidden trouble zone in the Ximaidai area, include the seismic effecting, shock wave and harmful gas of blast. The safety control measures are proposed to prevent the hazards and effects of mammoth blasting.(4) It is the most important research for Tongkeng mine presently to control the derived dynamical disasters of large scale hidden trouble area. In order to obtain reliable evidence to control the disasters, some characters, causes and essentials were analysed. The cracks evolvement laws of induced fracture are studied by digital panoramic borehole camera technique. The result shows that a technology based on digital monitoring and predicting can control the derived dynamical disasters of large scale hidden trouble area for Tongkeng mines.(5) Because of the solid mining and self-ignite condition, it is a problem for mining to the thermal harm and fire hazard in the Tongkeng Mine. By the numerical simulation, the effecting and PMV are computed under the thermal environment. According to the computed results, the ventilation system is optimized under the hidden trouble area. The measures of fire prevention are designed throught the performance-based design method.