沟谷及坡角对浅埋特厚煤层顶板导水断裂发育规律影响研究
Effects of Valley and Slope Angles on Movement Laws of Water Flowing Fracture in Roof of Shallow Buried Extra Thick Coal Seam
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摘要: 以不连沟煤矿F6201采区为工程背景，采用沟谷坡角60°的模型试验和数值分析相结合的方法，研究沟谷坡角对浅埋特厚煤层开采顶板覆岩运移及导水裂隙发育规律的影响。结果表明：顶板覆岩运移规律受主亚关键层控制：工作面推进112.5 m时，亚关键层1发生5次周期性垮落，垮落高度15 m，与大采高经验值（16.5±2.2）m相符；工作面推进120 m时，亚关键层2发生垮落，垮落高度37.5 m。此时，主关键层与亚关键层3同步发生垮落，整体垮落高度64.5 m；沟谷两侧导水裂隙发育高度分别为63、81 m；导水裂隙发育高度随沟谷坡角的增大而增大，以沟谷坡角≤30°和≥30°为界限划分为两区域，沟谷坡角60°的导水断裂带发育高度95 m，与试验垮落总高度102 m相吻合。Abstract: Taking F6201 mining area of Buliangou Coal Mine as the engineering background, adopting the valley slope angle 60° model test and numerical analysis method to study the influence of the valley slope angle on the overlying strata movement and the development of water flowing fractured height in shallow-buried and extra-thick coal seams, the study shows that: the migration laws of roof overburden were controlled by the main sub-key strata: when the working face advanced to 112.5 m, five periodic collapses occurred in the sub-key layer 1, with a height of 15 m, which was consistent with the experience value of 16.5±2.2 m of the large mining height; when the working face advanced to 120 m, the sub-critical layer 2 collapsed, with a height of 37.5 m; at this time, the main key stratum and the sub-key stratum 3 collapsed synchronously, and the overall collapse height was 64.5 m; the water-spraying fractures developed on both sides of the valley, with height of 63 m and 81 m; the development height of water flowing fractured height increases with the increase of the slope angle of the valley, and was divided into two regions by the slope angles ≤30°and ≥30°; the development height of the water flowing fractured with a slope angle of 60° in the valley was 95 m, which was in agreement with the total height of 102 m.
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