深部开采煤层顶板聚压规律的离心试验研究

在国内外相关研究的基础上，克服常规相似材料无法真实模拟原岩压力条件和介质力学环境的不足，采用离心模型试验，在以深部开采矿井赵楼煤矿首采区为地质背景所建立的工程地质模型基础上，对开采煤层完整顶板的直接顶与基本顶不同位置和两侧煤柱的矿山压力聚集规律进行了试验研究。试验结果表明：后方煤柱压力变化与直接顶的来压过程基本同步，前方煤柱压力变化程度小于后方煤柱，基本顶在来压时间、聚压强度及受力状态方面与直接顶存在明显的差异。离心模型试验能够通过施加离心荷载来模拟体现采动过程上覆岩层压力的动态变化，由此测试的煤柱受力和顶板岩层内的压力变化也更接近于实际情况。

Research on the law of underground pressure accumulation of complete roof in deep mining coal seam by centrifuge test

Based on domestic and foreign documents concerning this subject，the conventional similar materials simulation test can not simulate the original conditions and the mechanical environment in fact.Taking the geotechnical conditions of the first mining area in Zhaolou Coal Mine as geological background，the engineering geology model was set up.The laws of underground pressure accumulation on direct roof and main roof and coal pillar were drawn by centrifuge test.The results show that pressure variations of coal pillar and direct roof are basic synchrony，the degree of the variation of coal pillar pressure in front of working face is less than back，there are significant differences in coming pressure of time，pressure accumulation strength and loading stress case between the main roof and direct roof.Dynamic variations of the overlying strata pressure are simulated by applying centrifugal load in centrifuge，and the variations of pressure in coal pillar and roof strata are closer to the actual conditions.