Scheme Optimization Of The Panel Barrier Design And Study About Ground Pressure Monitoring In The Large Scale Backfilling Of Mine Stope

With the gradual depletion of the shallow resources, mineral resources development has become the inevitable trend of advancing deep. Rock burst occurs frequently as the mining depth increases and maximize the recovery of mineral resources safely is ensured by the scientific management and ground pressure monitoring.The ground pressure activities in Xinqiao Mining Cooperation Ltd (shortly, XMC) which caused by the shallow sublevel (-180m～-230m) having no permanent continuous panel barrier, the 0.15-0.20 km2 large mined-out area's being filled poorly and roof-contacted filling difficultly were analyzed and studied in detail, using such means as theoretical analysis, numerical simulation and ground pressure monitoring and aiming at the problem existing in the course of deep filling method (sublevel-230m～-270m). Main researching work and conclusions are summarized as follows:1. Based on fracturing mechanism and types of rock mass failure, the energy variation of rocks in failure process was studied on conversation of energy and the main factors that influenced the stability of the gob roof, the pillar and mechanical mechanism was discussed.2. The mechanical model of pillar and roof system was established, using the energy conservation principle and cusp catastrophe theory, According to the establishment of system potential function, the mechanism and necessary and sufficient conditions of catastrophe instability of pillar and roof system were revealed, and the stability of stope in XMC were analyzed based on it. A conclusion was drawn that the panel barrier would be necessary to be remained.3. Stress and displacement of underground stope in-270m with different design of panel barrier were simulated utilizing the large-scale finite element software MIDAS, and the design of panel barrier were optimized which took both economical benefit and site safety management into account.4. According to the numerical simulation results combined with on-site construction experience, the XMC's ground pressure monitoring network was designed. The monitoring network was established by putting the taseometer and displacemeter into reasonable place, and the displacement data obtained were analyzed to verify the reliability of the numerical simulation and to predict the ground pressure area which appeared more serious, which provided a basis for the safe and effective mining.