高位硬厚岩层下采场覆岩运动规律及采动应力演化规律

Movement rule of overlying strata and evolution law of mining stress in mining field under high and hard thick rock strata

针对工作面上覆巨厚坚硬岩浆岩条件,运用相似模拟试验和数值模拟方法,分别研究了硬厚岩层下采场覆岩运动和采动应力演化规律。研究结果表明,工作面上覆岩浆岩时,覆岩破断的关键阶段分别为直接顶破断、基本顶初次破断、基本顸周期破断、岩浆岩初次破断和岩浆岩周期破断(裂隙沟通地表);硬厚岩浆岩破断前,随着工作面的不断推进,煤体支承压力不断增加;硬厚岩浆岩破断后,采场支承压力要小于破断前。

According to the condition of thick hard igneous rock in working face, movement rule of overlying strata in the hard thick rock strata is studied by similar simulation test and numerical simulation method. Research shows that the coating on the working surface of magmatite, the key stage of rock breaking are immediate roof breaking, basic roof breaking, basic roof cy- cle breaking, magmatite first breaking, magmatite cycle breaking （fracture surface communication）; hard and thick magmatite before break, along with the industry as the advancement of abutment pressure increasing; hard thick magmatite breaking, abut ment pressure is smaller than before break.