近直立煤层群水平分段综放开采充填卸压防冲研究

Research on filling,pressure relief,and rock burst prevention in horizontal sublevel fully mechanized top coal caving of near-vertical coal seam groups

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中文摘要：目前近直立煤层开采冲击地压防治措施主要有爆破、水压致裂、建立保护层等,或破坏层间岩柱和顶底板,或难以解决大采深情况下的层间岩柱应力集中问题,且会导致较大的地表沉降.以乌东煤矿为工程背景,针对近直立煤层群水平分段综放开采方法,提出了充填采空区技术,以支护层间岩柱及顶底板,降低开采分段周围煤岩体的应力集中现象.设计了 3种充填方案:方案 1为第一开采分段采空区使用高强度材料充填,其余分段采用普通材料充填;方案 2为第一开采分段采空区使用高强度材料充填,其余分段交替采用高强度材料和普通材料充填;方案 3为每一分段采空区均使用高强度材料充填.通过数值模拟研究了 3种充填方案的卸压防冲效果,结果表明:与未充填相比,3种充填方案下层间岩柱最大垂直应力分别下降 25.07%,26.57%,29.23%,下一分段煤体最大水平应力分别下降 10.63%,10.79%,12.34%.综合考虑卸压效果和经济效益,优选间隔充填的方案 3.指出可结合高应力区域实时智能监测技术,及时支撑层间岩柱,减少层间岩柱及下分段煤体的应力集中,防止冲击地压发生.

外文摘要：Current rock burst prevention measures for near-vertical coal seam mining primarily include blasting,hydraulic fracturing,and the establishment of protective layers.These measures either damage interlayer rock pillars and roof/floor strata or prove inadequate in resolving stress concentration in interlayer rock pillars at large mining depths,often resulting in significant surface subsidence.Using the Wudong Coal Mine as the engineering context,this study proposed a filling technique for goafs in horizontal sublevel fully mechanized top coal caving of near-vertical coal seam groups.This technique was intended to support interlayer rock pillars and roof/floor strata,reducing stress concentration in the surrounding coal and rock masses of the mining segments.Three filling schemes were designed:Scheme 1 involved filling the goaf in the first mining segment with high-strength materials,with ordinary materials used in other segments;Scheme 2 involved filling the goaf in the first segment with high-strength materials,with alternating high-strength and ordinary materials in other segments;and Scheme 3 involved filling the goaf in each segment with high-strength materials.Numerical simulations were conducted to assess the pressure relief and rock burst prevention effectiveness of the three schemes.Results indicated that,compared to no filling,the maximum vertical stress in interlayer rock pillars decreased by 25.07％,26.57％,and 29.23％ under the three schemes,respectively,while the maximum horizontal stress in the coal body of the subsequent segment decreased by 10.63％,10.79％,and 12.34％,respectively.Considering both pressure relief effectiveness and economic feasibility,Scheme 3 with interval filling was identified as the optimal solution.It was suggested that this approach be combined with real-time intelligent monitoring technology in high-stress areas to promptly support interlayer rock pillars,thus reducing stress concentration and preventing rock bursts.

外文关键词：

fully mechanized top coal cavingnear-vertical coal seamrock burst preventionfilling miningfilling pressure reliefinterlayer rock pillarstress distribution

作者：

王子伟、程博源、魏炜杰、孙文超、谢东恒、谢缅羽

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作者单位：

国家能源集团新疆能源有限责任公司乌东煤矿,新疆乌鲁木齐 830000

中国矿业大学(北京)能源与矿业学院,北京 100083

关键词：

综放开采近直立煤层冲击地压防治充填开采充填卸压层间岩柱应力分布

基金：

中国博士后科学基金项目国家自然科学基金青年基金项目中央高校基本业务费资助项目中央高校基本业务费资助项目

项目编号：

2024T171006522041632024ZKPYNY042023YQTD02

出版年：

2024

DOI：

10.13272/j.issn.1671-251x.2024070119

工矿自动化

中煤科工集团常州研究院有限公司

工矿自动化

CSTPCD北大核心

影响因子：0.867

ISSN：1671-251X

年,卷(期)：2024.50(9)