下伏半采空型上层煤回采底板破坏特征与安全评价

周金艳; 赵立松; 卫皓皓; 高刚

下伏半采空型上层煤回采底板破坏特征与安全评价

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出版历程
- 发布日期: 2023-05-19

Floor failure characteristics and safety evaluation of upper coal mining with underlying semi-goaf

摘要

摘要: 在上层煤回采过程中，底板条件可能由于下层煤采空区而出现地层不完整的情况，底板条件的变化对上层煤回采中底板破坏影响明显。基于九龙矿15249S工作面微震监测数据，对底板事件活动性、顶底板比值、能量等多个参数进行统计、分析。研究结果表明：当下层煤为采空区时，上层煤回采时底板事件活动性强、扰动深度大；随着回采位置的前移以及下伏煤层条件的变化，底板与顶板事件频次之比发生较大变化，其变化规律与导水通道孕育形成等过程相吻合；下伏由采空区变为实体煤区域，底板破坏深度在0～5 m微震事件占比增长16.49%，5～20 m微震事件占比降低10.92%；上层煤层回采在接近下伏停采联络巷的过程中，大能量事件发育位置由浅部向深部延展。应用底板警戒层事件活动性、底板与顶板事件比值、距下伏煤层终采线距离、能量垂向密度参数构建底板安全评价体系，在下伏工作面停采位置前后为危险区，危险系数较高，可结合安全评价参数变化进行预警，加强水文地质观测。
- 半采空型 /
- 底板警戒层 /
- 底板与顶板事件频次之比 /
- 能量垂向密度 /
- 底板破坏深度
Abstract: In the process of upper coal mining, the floor condition may be incomplete because of the lower coal goaf, and the change of the floor condition has an obvious influence on the floor failure in the upper coal mining. Based on the micro-seismic monitoring data of 15249S working face in Jiulong Mine, the activity of floor events, the ratio of roof to floor, energy and other parameters are statistically analyzed. The results show that: when the lower coal is a gob, the activity of floor events is strong and the disturbance depth is large when the upper coal is mined. With the advance of mining location and the change of underlying coal seam conditions, the frequency ratio of floor and roof events changes greatly, and its change rule is consistent with the formation of water channel. The proportion of micro-seismic events increased by 16.49% and decreased by 10.92% when the bottom floor failure depth was 0-5 m and 5-20 m respectively. In the process of overlying coal stoping approaching the underlying stoping contact roadway, the development location of large energy events extends from shallow to deep. The floor safety evaluation system is constructed by using the parameters of floor warning layer event activity, floor and roof event ratio, distance from the stoping line of the underlying coal seam and vertical energy density. The danger zone before and after the stoping position of the underlying working face is a high risk factor, which can be combined with the changes of safety evaluation parameters for early warning and strengthening hydro-geological observation.
- semi-goaf /
- floor warning layer /
- ratio of floor and roof event frequency /
- energy density /
- floor failure depth

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参考文献(11)

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