Mine pressure behavior law of isolated island working face under extremely close goaf in shallow coal seam

作者：Tianwei Lan, Yonghao Liu, Yongnian Yuan, Hongliang Liu, Hongguang Liu, Shunfeng Zhang, Shunxiang Wang · 发表于：Scientific Reports · 年份：2023 · DOI：10.1038/s41598-023-47907-x · 被引用次数：12 · 研究领域：Geomechanics and Mining Engineering、Geoscience and Mining Technology、Advanced Algorithms and Applications

Abstract In order to study the mining pressure characteristics of the shallow buried coal seam with the same silo working face under the very close mining void zone and the overlying coal rock body, the theoretical analysis is used to determine whether the open-cutting eye bearing layer belongs to the mining under the very close mining void zone or not, based on the numerical simulation of FLAC3D and on-site measurement of the working resistance at the end of the cycle of the working face's hydraulic bracket, It is proposed to divide the mining stress of the working face based on the advancing length of the working face, that is, the high-pressure zone, the transition zone and the low-pressure zone. The results of the study show that: FLAC 3D software was used to analyze the stress intensity of the “C” island working face when it was mined back to 50 m, 100 m, 150 m, and 180 m (one time “square”), and the simulation results were imported into the Origin software, which was used to analyze the stress intensity of the working face. The simulation results were imported into Origin software, and the influence range of mining stress was divided into four areas: high-stress area, stress transition area, low-stress area, and "square" stress concentration area. According to the on-site measurement of the working resistance at the end of hydraulic support cycle, the initial pressure step of the working face under the overlying coal rock body is 48.9–55.7 m, with the peak value of 38 M...