Study on the movement characteristics of the overlying stratum and surrounding rock control in ultraclose coal seams: A case study
Study on the movement characteristics of the overlying stratum and surrounding rock control in ultraclose coal seams: A case study
复制标题
DOI：
10.1002/ese3.581
复制
发表时间：
2020-04
影响因子：
3.8
通讯作者：
Zhu Liu;Qiang-ling Yao;Ze Xia;Weinan Wang;Xue-hua Li
中科院分区：
文献类型：
--
作者：
Zhu Liu;Qiang-ling Yao;Ze Xia;Weinan Wang;Xue-hua Li
富村煤矿3上煤层与3下煤层的平均间距仅为6m，在开采上煤过程中，距上煤柱60m的下部巷道失稳。为控制下部巷道围岩，进行了物理模型试验和三维数值计算。物理相似模拟实验结果表明，综放工作面开采会导致远离煤层的高海拔关键层破裂。采空区的扩大导致了KLHE的大规模破裂和旋转，从而导致了LR的显著的矿压显现。数值计算结果表明，矿压差应在距煤柱19m以内。最后，提出了包括合理选址和支撑系统的方案。通过工业应用验证了该方案的可行性。
In Fucun Coal Mine, the average spacing between the 3upper coal seam (UCS) and 3lower 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.