College of Mining,Guizhou University

为研究近距离煤层采动条件下覆岩裂隙演化规律,以安顺煤矿9305工作面为研究对象,利用相似模拟试验研究近距离煤层开采过程中位移场与应变场的演化情况。结果表明:①上覆岩层随着工作面距离的不断推进,先形成离层裂隙和纵向裂隙,随后采空区中部部分离层逐渐压实;②位移场在工作面推进方向上出现不对称分布,工作面侧覆岩位移量明显小于采空区靠左区域,位移峰值主要集中在采空区中部;③最大主应变集中位置由采空区中部向开切眼侧以及工作面侧进行不对称转移,开切眼侧集中程度明显大于工作面侧,且最大主应变集中位置与瓦斯富集区存在潜在关联。

This study investigates the fracture evolution patterns of overlying strata under the mining conditions of close-distance coal seams. Taking the working face of Anshun Coal Mine as the re- search object,this study probed into the evolution of displacement field and strain field during the mining process of close-distance coal seams through physical similarity simulation test. The results show that ①with the continuous advancement of distance from the working face,the overburden strata first form separation cracks and longitudinal cracks,and then the middle part of the goaf is gradually compacted. ②The displacement field is asymmetrically distributed in the advancing direction of the working face,The displacement of the overlying rock on the side of the working face is obviously smal- ler than that on the left side of the goaf,and the peak displacement is mainly concentrated in the mid- dle of the goaf. ③The maximum principal strain concentration position is asymmetrically transferred OF MINING SCIENCE AND TECHNOLOGY from the middle of the goaf to the open-off cut side and the working face side. The concentration de- gree of the open-off cut side is significantly higher than that of the working face side. This reveals that a potential correlation exists between the maximum principal strain concentration position and the gas enrichment area.

国家自然科学基金(52164002,52064005);贵州省教育厅2023年度高等学校科技创新团队(黔教技[2023]055号);贵州省科技计划(黔科合基础-ZK[2024]重点022,黔科合支撑[2023]一般122)

梅福星,尚宇琦,孔德中,等.基于DIC技术近距离煤层采动裂隙-位移-应变演化规律相似模拟研究[J].矿业科学学报,2024,9(4):519-528.

MEI Fuxing,SHANG Yuqi,KONG Dezhong,et al. DIC-based similar simulation study on the evolution patterns of mining-induced fracture,displace-ment and strain in close distance coal seam [ J ]. Joural of Mining Science and Technology, 2024, 9 ( 4 ): 519 - 528.