自然崩落法开采过程中底部结构稳定性规律研究

采用应力、位移手段,并结合开采过程中底部结构岩体破裂裂隙宏观现象统计情况,综合对普朗铜矿矿区回采过程中底部结构稳定性规律进行研究,得出该地质条件下拉底推进过程对底部结构应力影响范围为推进线前后20m左右,同时基于应力与微震监测数据,得出底部结构开采过程中稳定性受断层影响较大,底部结构断层揭露线附近30m易诱发较大的应力集中,该范围内的岩体需要有针对性地进行二次支护。

The study on stability of bottom structure during natural caving mining

Based on the statistics of stress, displacement means and the macroscopic phenomena of rock fracture fracture in the bottom of the mining process, the stability of the bottom structure in the mining process of prong copper mine is studied comprehensively.Under this geological condition, the influence of the propulsion process on the bottom structure stress is about 20m around the propulsion line. At the same time, based on the stress and microseismic monitoring data, it is concluded that the stability of the bottom structure is greatly affected by the fault, and the large stress concentration is easily induced near the 30m near the fault line of the bottom structure, and the rock mass in this range needs two reinforcement support.