Shanxian Energy Co., Ltd., Feicheng Mining Group
Mining Engineering Research Institute, Shandong University of Science and Technology
Xinglongzhuang Coal Mine, Yankuang Energy Group Co.
Shandong Jingtai Engineering Science and Technology Co., Ltd.

为了防止在采掘过程中受遗留煤柱影响发生冲击地压事故,主要对工作面煤柱是否会发生失稳进行安全性分析。采用了传统的极限平衡理论计算护巷煤柱宽度,并且对遗留煤柱影响情况进行安全论证。研究结果表明,当煤层被巷道切割时,将会在工作面和巷道之间形成一定宽度的煤柱,而煤柱将处于超前支承压力峰值区内,造成煤柱上产生应力集中,当超过煤柱强度时,便会发生失稳。以陈蛮庄煤矿4302C工作面为对象进行研究,对工作面煤柱是否发生失稳进行安全性分析时采用传统的极限平衡理论计算护巷煤柱宽度。最后,通过FLAC3D数值模拟方法,分析工作面掘进时应力分布变化规律。由于4302C工作面按计划属于单侧采空,理论计算合理煤柱宽度应大于26.136m。因此,经对比该煤柱不会发生失稳。

process, we analyze the safety of the instability of the coal pillars on the working face. The traditional limit equilibrium theo-ry is used to calculate the width of the coal pillar, and the safety demonstration of the influence of the remaining coal pillaris carried out. The results show that when the coal seam is cut by the roadway, a certain width of coal pillar will be formedbetween the working face and the roadway, and the coal pillar will be in the peak area of the leading abutment pressure, re-sulting in stress concentration on the coal pillar. When the strength of the coal pillar is exceeded, instability will occur. Tak-ing the 4302C working face of Chenmanzhuang Coal Mine as the object of study, the traditional limit equilibrium theory isused to calculate the width of the coal pillar of the roadway when the safety analysis of the coal pillar of the working face iscarried out. Finally, through the FLAC numerical simulation method, the variation law of stress distribution during the ex-cavation of the working face is analyzed. Because the 4302C working face belongs to unilateral goaf as planned, the theoreti-cal calculation results show that the reasonable coal pillarwidth should be greater than 26. 136 m. Therefore, the coalpillar will not be destabilized.72