采空区下顶板失稳因素与控制技术  

Instability Factors and Control Technology of Roof under Goaf

作　　者：谭永新 TAN Yongxin(Asset Management Center of Shandong Energy Xinkuang Group,Xintai 271200,China)

机构地区：[1]山东能源新矿集团资产管理中心,山东新泰271200

出　　处：《煤炭技术》2022年第12期59-62,共4页Coal Technology

摘　　要：针对采空区下工作面开采过程中,受二次采动影响,顶板受到不同程度损伤,从而使顶板稳定性变差,容易出现顶板冒顶、片帮等围岩灾变问题。以某矿6101工作面为工程背景,通过对近距离煤层群采空区下顶板结构进行分析,找出近距离煤层采空区下顶板失稳影响因素;从顶板、煤壁、支架3个方面考虑影响顶板失稳因素,利用FLAC3D模拟软件,分析上位煤层开采后下位煤层的应力塑性区条件;通过对顶板-煤体强度、推进速度与支架工况3个方面,对顶板失稳提出防治建议,为近距离煤层采空区下煤层开采提供了有效经验。In the mining process of the working face under the goaf, the roof is damaged to varying degrees due to the influence of secondary mining, which makes the stability of the roof worse, and is prone to roof fall, wall and other surrounding rock disasters. Taking 6101 working face of a mine as the engineering background, analyzes the structure of the lower roof in the goaf of close coal seam group,and finds out the influencing factors of the instability of the lower roof in the goaf of close coal seam;considering the factors affecting roof instability from three aspects of roof, coal wall and support, the stress-plastic zone conditions of lower coal seam after upper coal seam mining are analyzed by using FLAC3Dsimulation software;through the three aspects of roof coal strength, propulsion speed and support working condition, the prevention and control suggestions for roof instability are put forward,which provides effective experience for the mining of coal seams under the goaf of close coal seams.

关 键 词：采空区 煤层群 顶板失稳 支架工作阻力 

分 类 号：TD3533[矿业工程—矿井建设]