中国安全科学学报 ›› 2022, Vol. 32 ›› Issue (5): 68-76.doi: 10.16265/j.cnki.issn1003-3033.2022.05.1535

• 安全工程技术 • 上一篇    下一篇

带压开采煤层底板破坏特征与突水风险分析

李刚1(), 刘海振1, 杨庆贺1, 牛伟锋2   

  1. 1 辽宁工程技术大学 矿业学院,辽宁 阜新 123000
    2 霍州煤电集团 辛置煤矿,山西 霍州 031400
  • 收稿日期:2021-12-24 修回日期:2022-03-12 出版日期:2022-08-17 发布日期:2022-11-28
  • 作者简介:

    李刚 (1979—),男,吉林德惠人,博士,副教授,主要从事矿山压力及巷道围岩控制和带压开采技术方面的教学和研究。E-mail:

    牛伟锋, 高级工程师

  • 基金资助:
    国家自然科学基金资助(52174077); 国家自然科学基金资助(51774165); 辽宁工程技术大学创新团队项目(LNTU20TD-05)

Analysis on failure characteristics of coal seam floors and water inrush risks in mining under pressure

LI Gang1(), LIU Haizhen1, YANG Qinghe1, NIU Weifeng2   

  1. 1 Mining Institute, Liaoning Technical University, Fuxin Liaoning 123000, China
    2 Xinzhi Coal Mine of Huozhou Coal and Electricity Group, Huozhou Shanxi 031400, China
  • Received:2021-12-24 Revised:2022-03-12 Online:2022-08-17 Published:2022-11-28

摘要:

为弄清采动条件下底板破坏特征,以辛置煤矿10409工作面为研究对象,采用理论分析和数值模拟相结合的研究方法,详细研究采动过程中底板应力场分布特征和底板岩层破坏损伤演化特征,结合现场压水试验验证结果,得出采动条件下煤层底板岩层中支承压力分布规律和底板岩层破坏范围,并分析评价矿井10号煤层带压开采风险。结果表明:采动影响下煤层底板呈现拉张破坏-压实-拉张破坏的周期性破坏,影响底板破坏深度的工作面长度临界值约为160 m;底板岩层最大破坏深度可达9.50 m,底板突水最大风险点滞后工作面2.6 m左右。

关键词: 带压开采, 底板破坏, 突水风险, 理论计算, 数值模拟, 压水试验

Abstract:

In order to study characteristics of floor failure under mining conditions, with working face 10409 of Xinzhi Coal Mine as a research object, distribution characteristics of floor stress field and damage evolution of floor strata were studied in detail by using a combination of theoretical analysis and numerical simulation methods. Then, based on verification results of on-site pressurized water test, distribution law of bearing pressure in coal seam floor strata and damage range of floor strata during mining process were obtained. Finally, mining risks of No. 10 coal seam under pressure was analyzed and evaluated. The results show that under influence of mining, the floor of coal seam presents periodic failure of tension failure-compaction-tension failure, and the critical value of working face length that affects failure depth of floors is about 160 m. The maximum failure depth of floor strata can reach 9.50 m, while maximum water inrush risk point lag behind working face is about 2.6 m.

Key words: pressurized coal mining, floor failure, water inrush risk, theoretical calculation, numerical simulation, pressurized water test