煤层开采底板破坏数值模拟对比研究

Comparative Study on Numerical Simulation About Mining Floor Damage

采用数值模拟方法模拟煤层开采过程可以有效模拟应力变化过程,从而掌握底板变形破坏情况。通过对某煤矿深部下组煤首采区完整岩层和有断层岩层2种情况进行数值模拟,对比分析首采区采动应力变化和底板破坏情况,发现在断层影响下,终采线附近最大应力值远大于完整岩层的最大应力值,进而导致底板破坏深度大大增加,为下组煤开采预防底板突水和正确留设防隔水煤柱提供了重要参考。

Using numerical simulation method to simulate coal seam mining can simulate the stress change process effectively. Through simulating the damage of the integrated floor and the fault floor in the deep lower first mining area,the author analyzed the status of stress change and floor damage in two different situations. Under the influence of the fault,the maximum stress near the stop line is much bigger than in complete stratum stop line,and then lead to the increase of the floor damage depth. It will provide an important reference to prevent floor water inrush and setting up the security coal pillar.