Study on the Influence of Fully Mechanized Mining in Near Shallow and Extra Thick Coal Seam on the Movement Law of Overlying Strata

Authors

  • Qingjie Qi, Yingjie Liu, Shuai Huang, Wengang Liu

Abstract

In order to reveal the influence of fully mechanized mining in super thick coal seam on the overlying strata, this paper takes the mining of 2-2 coal and 5-2 coal in Daliuta coal mine as the engineering background, and studies the superposition effect of fracture development and fracture of overlying strata after the mining of upper and lower coal seams by means of theoretical analysis and similar simulation experiment. The results show that: after coal mining, the movement law of overlying strata shows that the boundary of fracture area and compaction area can be replaced by trapezoid, which can meet the needs of practical engineering; the horizontal displacement value of strata has a skewness in the horizontal distribution, that is, the horizontal displacement value on one side of the open cut is larger, and the horizontal displacement value on the other side of the working face is smaller than that on the other side of the open cut; during mining, the fracture penetrates The development process of the crossing zone is characterized by obvious stages and zonation, and it can be divided into fracture development area and compaction stability area horizontally. The development and movement of the separation fracture and fracture fracture are not completely synchronous, and the development from the bottom to the top is uneven. Generally, the development speed of the separation fracture is faster than that of the fracture fracture

Published

2020-02-29

Issue

Section

Articles