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本文根据上煤层内观测巷的实际测定的采场上复岩层移动、移近量及压力等资料,说明采动岩体沿走向可根据支撑条件分为煤柱支撑、离层及矸石压实三区,使上复岩层形成平衡的结构,而上行开采的最小煤层间距应达到此平衡带的高度。由顶板下沉曲线及岩块变形的几何条件分析得出此安全间距应与下煤层的采高、层间岩性及结构等有关。
Based on the actual measurement of the observation lane in the coal seam, the data of the movement of the overlying strata, the near displacement and the pressure of the stope in the mining stope indicate that the mining rock mass along the strike can be divided into pillar support, delamination and gangue compaction three Area, so that the upper strata formation of a balanced structure, while the minimum upstream coal mining interval should reach the height of the balance zone. Based on the analysis of the settlement curve of the roof and the geometric conditions of the deformation of the rock mass, it is concluded that the safety clearance should be related to the mining height, interlayer lithology and structure of the lower coal seam.