煤炭工程 ›› 2025, Vol. 57 ›› Issue (6): 96-105.doi: 10. 11799/ ce202506013

• 生产技术 • 上一篇    下一篇

大采高工作面连续采动下动压显现特征与顶板致灾机制研究

杜伟,王小军,李成东,等   

  1. 1. 陕西小保当矿业有限公司,陕西 榆林 719000

    2. 中煤科工开采研究院有限公司,北京 100013

    3. 天地科技股份有限公司 开采设计事业部,北京 100013

    4. 河南理工大学 土木工程学院,河南 焦作 454003

  • 收稿日期:2024-08-30 修回日期:2024-10-05 出版日期:2025-06-11 发布日期:2025-07-15
  • 通讯作者: 李震 E-mail:zhenli@hpu.edu.cn

Dynamic pressure behaviors and roof disaster mechanism under continuous mining of large mining height working face

  • Received:2024-08-30 Revised:2024-10-05 Online:2025-06-11 Published:2025-07-15
  • Contact: Zhen Li E-mail:zhenli@hpu.edu.cn

摘要:

针对大采高工作面连续采动下动压显现与顶板致灾机制问题,以小保当煤矿2-2煤层连续开采下顶板冒漏典型案例为背景,分析了大采高工作面异常来压前后的支架支护阻力和强动压显现特征,在此基础上综合岩层沉积特征分析、数值模拟、微震监测、模型试验、现场勘查等手段,揭示了大采高工作面连续采动顶板致灾机制。结果表明:动压显现在机尾侧更为突出,动压显现前均存在持续性来压,可能伴随相对平静期,临空工作面来压时强度高、范围大;动压显现位置岩层结构表明在横向上岩性、岩层厚度空间交替与急剧变化,在竖向上多层厚硬岩层与薄层不稳定顶板同时发育;连续采动时损伤区横跨多工作面连通,呈现不同层位顶板同步损伤断裂特征;强动压显现集中于机尾,临空一侧损伤和应力增长情况相对突出,呈现损伤破断不均衡性与差异性;连续采动下采空区厚硬顶板结构可再次断裂活化,引发微震事件、顶板动载、高位岩层下沉。

关键词:

动压显现 , 顶板灾害 , 矿山压力 , 损伤演化 , 致灾机制

Abstract:

Focusing on the dynamic pressure manifestation and roof disaster mechanisms under continuous min-ing of large mining height working faces, the typical case of roof caving in the 2-2 coal seam at the Xiaobaodang Coal Mine was used as the background. The support resistance and the strong dynamic pressure before and after abnormal pressure were analyzed. On this basis, through a comprehensive ap-proach that includes deposition analysis, numerical simulation, microseismic monitoring, model testing, and field investigation, the mechanism was revealed. The results show that the dynamic pressure mani-festation is more pronounced on the tail side, with continuous pressure appearing before the manifesta-tion of dynamic pressure, possibly accompanied by a relatively calm period. When the working face comes under pressure, the intensity is high, and the affected area is large. The rock layer structure indi-cates lateral alternation and rapid changes in lithology and rock layer thickness, with multiple thick hard rock layers and thin unstable roof layers developing simultaneously in the vertical direction. The damage zone spans multiple working faces, showing synchronous damage and fracture characteristics at different roof levels. Strong dynamic pressure is concentrated at the tail, with damage and stress growth more pronounced on the unsupported side, displaying unevenness and differences. The thick hard roof structure in the goaf can be reactivated and fractured, leading to microseismic events, roof dynamic loads, and subsidence of high-level rock layers. The research findings provide significant reference for disaster early warning, prevention, and safety production in continuous mining of large mining height working faces.

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