大型三维可加载物理相似模拟实验中围岩变形的声发射特征

Acoustic Emission Features of Surrounding Deformation in Experiment of Large 3D Loadable Physical Similar Simulation

针对清水营煤矿一号回风斜井的复杂围岩环境,构建了大型三维物理相似模拟实验模型,进行了不同静载与动载相结合的加载实验,实现了实验过程的"声—光—电"等综合信息指标参数的实时监测。对井筒围岩变形的声发射特征进行分析显示:围岩的破裂与变形在经历"振荡—沉寂"的过程之后,可能出现持久性的破坏。研究结果为围岩变形破坏提供前兆信息,对现场支护方式、支护参数和支护时机的合理选择具有一定的指导意义。

According to the complicated surrounding environment in the No. 1 Mine Inclined Ventilation Shaft of Qingshuiying Mine, a large 3D physical similar simulation experiment model was established, the different static load and dynamic load combined loading experiments were conducted and the on - time monitoring and measuring on the index parameters of the ＂sound - light - electric＂ and comprehensive information during the experiment process were realized. The analysis on the acoustic emission features of the surrounding rock along the mine shaft was conducted and showed that after ＂the oscillation - quiet＂ process, the cracking and deformation of the surrounding rock would have enduring failure occurred. The study results could provide the omen information of the surrounding rock deformation and failure and could have certain guide references to the rational selection of the site support method, the support parameters and the support time.