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为保障上分层遗留煤柱高效安全回收,通过数值模拟和现场实测相结合的方法分别研究了煤柱在形成阶段和回收期间的应力演化规律。结果表明:煤柱两侧工作面开采致使煤柱区应力叠加,下分层煤体沿工作面倾向呈现原始应力区、应力集中区和卸压区的交替形式;当煤柱形成有200 m和回收至200 m时,煤柱在形成阶段和回收期间的应力最大值接近,分别为35 MPa和35.05 MPa,但受支撑作用影响,两者最大应力值分别位于开采方向中部100 m和开采方向200 m;煤柱形成阶段的应力演化结果能够满足煤柱安全回收要求。
In order to ensure the efficient and safe recovery of coal pillar on the upper strata, the stress evolution law of coal pillar during the formation phase and the recovery period was studied through the combination of numerical simulation and field measurement. The results show that the stress of coal pillar area is superimposed by the mining of working face on both sides of coal pillar. The lower stratified coal body presents the alternation of original stress zone, stress concentration zone and pressure relief zone along the working face. When coal pillar is formed with 200 m and When recovered to 200 m, the maximum stress of coal pillar during the formation phase and recovery period are close to 35 MPa and 35.05 MPa, respectively. However, due to the support effect, the maximum stress value of the coal pillar is located in the middle of mining direction 100 m and mining direction 200 m; The stress evolution of coal pillar formation stage can meet the requirements of coal pillar safety recovery.