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针对邻近层同采工作面回采巷道受多次采动影响变形量大的问题,采用理论分析、数值模拟和现场实测的方法对邻近层同采工作面在走向和倾向上的不同错距进行了研究。结果表明:1)邻近层工作面同采过程中,上下两工作面间岩层受多重采动影响经历了连续—似连续—非连续—散体的过程;2)走向错距不同时,邻近层工作面支承压力峰值、围岩破坏范围和破坏程度由大到小依次为错距20 m、错距0 m、错距50 m、错距60 m;3)受多重采动影响,下工作面运输巷位移随工作面的临近呈现台阶式增加,经历了2次逐渐增加—明显增加—稳定的过程。采区设计应考虑邻近层工作面同采产生的多重采动影响,设计并优化得出合理的走向错距和倾向错距,改善工作面回采时采场围岩尤其是回采巷道围岩的力学状态。
Aiming at the problem that the deformation of the mining roadway near the mining face in the adjacent working face affected by multiple mining is large, theoretical analysis, numerical simulation and on-site measurement are used to measure the differences in the trends and tendencies of the adjacent working face with the same mining face the study. The results show that: 1) During the same mining process in the adjacent working face, the strata between the upper and lower working faces underwent continuous continuous-continuous-discontinuous-dispersion process under the influence of multiple mining; 2) The pressure of supporting face of working face, the destructive range and destructive degree of surrounding rock descending order are 20 m, offset distance 0 m, offset distance 50 m, offset distance 60 m; 3) Affected by multiple mining, The displacement of transportation lane shows a stepwise increase with the approaching of the working face, which has undergone two gradual increases - obviously increase - the process of stability. The design of mining area should take into account the multiple mining effects caused by the same mining with the adjacent working face and design and optimize the reasonable deviation of heading and inclination to improve the mechanics of the surrounding rock of mining face, status.