College of Geology and Mines Engineering, Xinjiang University, Urumqi 830046, China.
Key Laboratory of Environmental Protection Mining for Minerals Resources at Universities of Education, Department of Xinjiang Uygur Autonomous Region, Xinjiang University, Urumqi 830047, China.
Sensors (Basel). 2022 Apr 3;22(7):2761. doi: 10.3390/s22072761.
The question of how to mine safely in close multi coal seams is the main concern for coal operators, in particular for large-dip coal seams with complex geological and mechanical conditions. This paper presents a detailed similarity simulation on the movement characteristics of the overburden and the stress distribution of underlying strata in terms of a specific coal mine in the Tielieke mining area of the Kubai coalfield via a three-dimensional photogrammetry system and a high-speed static resistance analyzer. The results show that the overburden strata are asymmetrically deformed around the coal pillar and the fracture area is perpendicular to the longwall with an "" shape when deeper coal is mined. Moreover, the asymmetric movement of overburden results in the non-uniform distribution of stress on the floor of the coal pillar and ribs. In particular, stress is closely related to the location of the longwall, and stress of the coal pillar is much larger when it is closer to the deep side. The floor stress relief degree of the longwall in the deep zone is higher than that of its counterparts, providing a theoretical foundation for a reasonable layout and a support technique for roadways. The main contribution of this research that it can be used as a reference in maintaining the integrity of surrounding rock for large-dip coal seams with close distances.
如何在近距离多煤层中安全开采是煤炭作业者关注的主要问题，特别是对于具有复杂地质和力学条件的大倾角煤层。本文通过三维摄影测量系统和高速静态阻力分析仪，对库拜煤田铁列克矿区某具体煤矿的上覆岩层移动特征和下伏岩层应力分布进行了详细的相似模拟。结果表明，当开采深部煤层时，煤柱和断裂区域周围的覆岩呈非对称变形，呈“”形。此外，覆岩的非对称运动导致煤柱底板和煤帮的应力分布不均匀。特别是，应力与工作面的位置密切相关，且靠近深部时煤柱的应力要大得多。深部工作面的底板应力释放程度较高，为合理的巷道布置和支护技术提供了理论基础。本研究的主要贡献在于，它可以作为近距离大倾角煤层围岩完整性维护的参考。
