Study on the movement characteristics of the overlying stratum and surrounding rock control in ultraclose coal seams: A case study,Energy Science & Engineering

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Study on the movement characteristics of the overlying stratum and surrounding rock control in ultraclose coal seams: A case study
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-01-01 , DOI: 10.1002/ese3.581
Liu Zhu ₁ , Qiangling Yao ₁ , Ze Xia ₁ , Weinan Wang ₁ , Xuehua Li ₁

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In Fucun Coal Mine, the average spacing between the 3_upper coal seam (UCS) and 3_lower coal seam (LCS) is only 6 m. In the process of mining upper coal, the lower roadway (LR), which is 60 m away from upper pillar, becomes unstable. In order to control the surrounding rock of lower roadway, a physical model experiment and a 3D numerical calculation were performed in this study. The results of physical similarity simulation experiment show that mining of longwall face in UCS will lead to fracturing of key layers at a high elevation (KLHE) far away from the coal seam. The expanded goaf area caused large‐scale fracturing and rotation of the KLHE, which resulted in significant strata pressure behavior in LR. The numerical calculation results show that the LR should be within 19 m of the coal pillar. Finally, a plan which includes a proper location and a supporting system was proposed. The feasibility of the proposed plan is verified by an industrial application.

中文翻译：

极近距离煤层上覆岩运动特征及围岩控制研究-以案例研究为例

在福村煤矿，_上部3个煤层（UCS）和_下部3个煤层之间的平均间距煤层（LCS）只有6 m。在开采上层煤的过程中，与上层支柱相距60 m的下层巷道（LR）变得不稳定。为了控制下部巷道的围岩，本研究进行了物理模型试验和3D数值计算。物理相似性模拟实验的结果表明，UCS中长壁工作面的开采将导致远离煤层的高海拔（KLHE）关键层破裂。采空区的扩大引起了KLHE的大规模压裂和旋转，从而导致了LR中显着的地层压力行为。数值计算结果表明，LR应在煤柱19 m以内。最后，提出了包括适当位置和支持系统的计划。

更新日期：2020-01-01

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