doi:10.16186/j.cnki.1673-9787.2021040052

Received:2021/04/22

Revised:2021/05/07

Published:2022/07/15

Study on subsidence law of coal surface under combined action of adjacent mining in deep mountain area

YANWeitao 1, ZHANGChaohui 2, CHENZhen 2, CHENJunjie 1

1.School of Surveying and Land Information Engineering， Henan Polytechnic University， Jiaozuo 454000 ， Henan， China;2.Shanxi No.114 Institute of Coal Geological Exploration， Changzhi  046011 ， Shanxi， China

Abstract: To reveal the law of surface subsidence under the dual action of adjacent mining in deep mountain area, taking working face 1310 of Jincheng coal mine as an example, the dynamic and static special subsid- ence law of the surface was analyzed by using the method of field measurement. The results showed that the subsidence values of the flat bottom part of the surface movement basin of working face 1310 were seriously un- equal, and the deformation values were no longer zero. The strike limit angle was 63. 1°， and the strike angle of critical movement was 72.8°. The offset of strike inflection point was 148 m, the offset of uphill inflection point was -20 m, and the offset of downhill inflection point was -21 m. The high reverse slope reduced the original subsidence degree and subsidence scope, so the range of surface mining influence was reduced, and the limit angle and angle of critical deformation were increased. On the contrary, the adjacent mining increa- ses the original subsidence degree and subsidence scope,expanded the influence scope of surface mining, makes the movement deformation curve slow , reduced the inflection point offset, and transfered the inflection point to the top of coal pillar , resulting in the negative offset of inflection point. The research results could provide an example reference for similar conditions to reveal the law of subsidence and subsidence prediction.

Key words:high reverse slope;adjacent mining;deep mining;actual measured law;mining subsidence

山区地下深部临近采煤工作面地表沉陷规律研究_闫伟涛.pdf