煤炭工程 ›› 2025, Vol. 57 ›› Issue (4): 108-115.doi: 10. 11799/ ce202504016

• 研究探讨 • 上一篇    下一篇

末采期间覆岩破断特征及主回撤通道稳定性研究

肖江,王怡辉,孙亚超,等   

  1. 1. 西安科技大学
    2. 西安科技大学研究生院
  • 收稿日期:2024-06-05 修回日期:2024-08-07 出版日期:2025-04-10 发布日期:2025-05-28
  • 通讯作者: 王怡辉 E-mail:1229143357@qq.com

Fracture characteristics of overlying strata and the stability of main withdrawal channel during the final mining period

  • Received:2024-06-05 Revised:2024-08-07 Online:2025-04-10 Published:2025-05-28

摘要:

针对末采期间厚硬基本顶破断影响巷道稳定性的问题,以凉水井煤矿42206工作面为工程背景,运用物理相似模拟试验、理论分析和数值模拟等综合研究方法,在分析末采期间覆岩垮落规律、力学传递机制、应力演化特征影响因素的基础上,采用切顶协同控制技术,以实现贯通主回撤通道时基本顶在预想位置破断,保证围岩稳定性的目的。结果表明:基本顶破断位置影响支撑压力大小呈现出“支架后方<巷道上方<实体煤上方”的规律;对比数值模拟研究采用切顶调压可改变基本顶破断位置为支架后方时,主回撤通道围岩应力状态、通道间煤柱裂隙、塑性区范围均处于较小值,保证了贯通期间通道围岩稳定性。

关键词:

覆岩破断 , 回撤通道 , 围岩变形 , Voronoi块体 , 切顶调压

Abstract:

Aiming at the problem that the fracture characteristics of thick and hard basic roof affect the stability of roadway during the final mining period, taking 42206 working face of Liangshuijing Coal Mine as the engineering background, using comprehensive research methods such as physical similarity simulation test, theoretical analysis and numerical simulation, on the basis of analyzing the influencing factors of overburden caving law, mechanical transmission mechanism and stress evolution characteristics during the final mining period, the roof cutting cooperative control technology is adopted to realize the basic roof breaking at the expected position when the main retracement channel is penetrated, so as to ensure the stability of surrounding rock. The results show that the influence of the breaking position of the main roof on the support pressure shows the law of ' behind the support < above the roadway < above the solid coal '. In the comparative numerical simulation study, when the main roof breaking position can be changed to the rear of the support by roof cutting and pressure regulation, the stress state of the surrounding rock of the main withdrawal channel, the crack of the coal pillar between the channels and the range of the plastic zone are all at a small value, which ensures the stability of the surrounding rock of the channel during the penetration period and provides a certain reference for other similar projects.

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