叠加开采顶板变形破坏离散元模拟研究

Discrete Element Simulation of Roof Deformation and Failure by Overlapping Mining

为了研究叠加开采煤层顶板破坏高度发育规律,利用离散单元法模拟煤层在叠加开采过程中顶板变形破坏情况.分析了矿区水文地质和工程地质条件,建立离散元模型,并根据工作面开采情况进行模拟.模拟结果表明:叠加开采会导致煤层顶板破坏高度明显增加,有较大可能导通顶部的含水层,造成突水事故的发生.在开采前必须查清含水层的富水区域,对相应区域做好探放工作,以确保矿井安全生产.

In order to research the development rule of the damage height of roof by overlapping mining, the deformation and failure of roof were simulated with discrete element method. The hydrogeological and engineering-geological conditions of the mine were firstly analyzed and element model built. The simulation results show that the overlapping mining may obviously increase the damage height of roof and is quite possible to touch the aquifer, leading to water burst in the mine. So the water enrichment area of the aquifer must be detected and the roof water exploration and draining completed to ensure the safety production.