Abstract

The strong mine pressure disaster easily induced by the high stress concentration area of deep coal seam bifurcation and merging area (CSBMA). Zhangshuanglou Coal Mine was selected as the research site. Theoretical analysis, physical and numerical simulation and field measurement was adopted to study the evolution law and control technology of mining-induced stress in the deep CSBMA. The main conclusions are as follows: (1) from the bifurcation area to the merging area, the peak value of the front abutment pressure decreases first and then increases slightly to a stable evolution law with the gradual decrease of the coal seam spacing. From the merging area to the bifurcation area is the opposite. (2) The coal seam spacing of the bifurcation area is 7.5–25 m, which is the area where the peak value of the front abutment pressure increases. The maximum peak value is located at the junction of the normal area and the bifurcation area, and the stress concentration coefficient is about 2.1. (3) After the control technology of coal seam water injection softening is adopted for the high stress concentration area, the maximum peak stress concentration coefficient is reduced to about 1.6, which effectively reduces the stress concentration degree. The evolution law of mining-induced stress in the deep CSBMA provides guidance for the prevention and control area of strong mine pressure disaster in this area, and ensures the safe mining of working face.

中文翻译：

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深部煤层分岔合并区工作面采动应力演化机制及控制技术——以实例研究

摘要

深部煤层分岔合并区(CSBMA)应力集中区易诱发强矿压灾害。选择张双楼煤矿作为研究地点。采用理论分析、物理数值模拟和现场实测等方法，研究了深部CSBMA采动应力演化规律及控制技术。主要结论如下：（1）从分岔区到合流区，随着煤层间距的逐渐减小，前端支承压力峰值呈现先减小后小幅增大的稳定演化规律。从合并区到分叉区则相反。 （2）分岔区煤层间距为7.5~25 m，是前部支承压力峰值增大的区域。最大峰值位于正常区与分叉区交界处，应力集中系数约为2.1。 （3）高应力集中区采用煤层注水软化控制技术后，最大峰值应力集中系数降低至1.6左右，有效降低了应力集中程度。 CSBMA深部采动应力演化规律为该区强矿压灾害防治提供指导，保障工作面安全开采。