煤炭工程 ›› 2025, Vol. 57 ›› Issue (6): 24-33.doi: 10. 11799/ ce202506004

• 设计技术 • 上一篇    下一篇

厚硬顶板工作面过断层“ 裂-注-排-支”协同防控技术研究

徐东,郑锐,李迎龙   

  1. 1. 河北工程大学 矿业与测绘工程学院,河北 邯郸 056038

    2. 中国矿业大学 冲击岩爆巷道支护研究中心,江苏 徐州 221116

    3. 山西中煤担水沟煤业有限公司,山西 朔州 036000

  • 收稿日期:2024-09-09 修回日期:2024-12-06 出版日期:2025-06-11 发布日期:2025-07-15
  • 通讯作者: 徐东 E-mail:cumtxudong@cumt.edu.cn

Collaborative prevention and control technology of “fracture-injection-discharge support”for thick and hard roof working face crossing faults

  • Received:2024-09-09 Revised:2024-12-06 Online:2025-06-11 Published:2025-07-15
  • Contact: dong xu E-mail:cumtxudong@cumt.edu.cn

摘要:

针对厚硬覆岩顶板工作面回采过断层期间围岩稳定性控制难度大、动力灾害频发的工程难题,通过理论分析、数值模拟与现场试验相结合的方法,系统研究了工作面过断层过程中覆岩运移特征及围岩应力动态演化规律,提出了“裂-注-排-支”协同防控技术体系。研究表明:随着工作面与断层面间煤体尺寸减小,厚硬顶板沿断层面滑移失稳风险增大;断层面具有显著应力阻隔效应,导致上盘区域形成应力增高区(峰值应力达33.96 MPa)、下盘区域形成应力降低区;工作面过断层围岩应力演化可划分为断层静止期、活化期、运动期、应力释放期和稳定期5个阶段;通过在断层运动期前分阶段实施围岩卸压-加固协同防控措施(如水力压裂切顶、煤层注水软化、大直径钻孔卸压及锚杆索补强支护),可有效改善围岩应力分布状态,降低工作面周期来压强度35.8% ~57.6%,减少冲击动载能量释放量,将巷道围岩变形量控制在388~589mm范围内,显著提升断层区域围岩稳定性,实现了厚硬覆岩顶板综放工作面安全高效过断层的工程目标。

关键词:

厚硬顶板 , 断层构造 , 滑移失稳 , 应力演化 , 协同防控 , 断层活化 , 围岩稳定性

Abstract:

In view of the problems of difficult control of surrounding rock stability and frequent disasters during the mining of thick and hard overburden roof working face passing through faults. This paper adopts theoretical analysis, numerical simulation, and field test to study the characteristics of overlying rock migration and the dynamic evolution law of surrounding rock stress during the working face passing through faults. A collaborative prevention and control technology of "fracture-injection-discharge-support" is proposed for the working face passing through faults. Research has shown that as the size of coal between the working face and the fault plane decreases, the risk of instability caused by the sliding of thick and hard roof along the fault plane increases. There is a stress barrier effect on the fault plane, with an increased stress zone in the hanging wall area and a decreased stress zone in the footwall wall area. The working face passing through a fault is divided into five periods, fault stationary period, fault activation period, fault movement period, fault stress release period, and fault stability period. Before the fault movement period, the coordinated measures of rock unloading and solidification are adopted in stages, which can improve the stress distribution environment of the surrounding rock and the structure of the surrounding rock in the mining site, effectively reduce the mining pressure and impact dynamic manifestation of the working face, improve the stability of the surrounding rock in the fault area, and achieve safe and smooth passage of the thick and hard overlying rock roof working face through the fault.

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