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OA北大核心CSTPCD

This study investigates the fracture evolution patterns of overlying strata under the mining conditions of close-distance coal seams.Taking the 9305 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 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.