Study on the Characteristics of Overlying Strata Movement Under the Influence of Mining in Thick and Extra-Thick Coal Seams Group
Taking the(4-5)02 working face,(9-15)06 working face and(9-15)08 working face of Liuhuanggou coal mine in Xinjiang as the research object,with the help of UDEC numerical simulation software and field monitoring data,the characteristics of overlying strata movement and the influence of overlying strata movement on the mining of lower coal seam were explored in the mining process of thick and extra-thick coal seams group.The results show that the overlying strata movement presents obvious characteristics of"upper weak and lower strong"under the influence of multi-layer key strata control.The key strata control causes that the overlying strata movement show obvious"low-medium-high"gradual development characteristics from bottom to top.In the mining process of the upper coal seam,the upper hard sandstone is not easy to break and damage,and the overlying strata movement is not complete,resulting in a large fracture damage in the high and middle strata during the mining process of the lower coal seam,and there is a large elastic energy release.In this regard,reasonable and effective roof pre-splitting and other control methods should be carried out in the mining process of the upper coal seam to avoid large energy release in the mining process of the lower coal seam.
Thick and extra-thick coal seamCoal seams group miningOverlying strata movementKey strata controlNumerical simulation
万方数据
维普
