YANG H, LIU D, JIA M K,et al.Study on surface subsidence characteristics induced by overburden separation grouting in thick coal seam mining[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(3):93-103.

doi:10.16186/j.cnki.1673-9787.2025100030

Received:2025/10/23

Revised:2026/01/24

Published:2026/04/28

Study on surface subsidence characteristics induced by overburden separation grouting in thick coal seam mining

Yang Heng1, Liu Dong1,2, Jia Mingkui1, Guo Yu1,2, Ge Zhibo3, Guo Wenbing3, Li Shuwen4, Yan Hao5

1.Henan Energy Group Co.， Ltd.， Zhengzhou  450000， Henan， China；2.Henan Energy Group Research Institute Co.， Ltd.， Zhengzhou  450000， Henan， China；3.School of Energy Science and Engineering， Henan Polytechnic University，  Jiaozuo  454003， Henan， China；4.Henan Energy Yima Coal Industry Group Co.， Ltd.， Yima  472300， Henan， China；5.School of mines，China University of Mining and Technology， Xuzhou  221118， Jiangsu， China

Abstract: Objectives This study aims to investigate the surface subsidence characteristics of overburden separation grouting under different working face layouts.  Methods The 11090 and 11080 working faces of a mine in Yimei Group were taken as the engineering background， and a combination of theoretical analysis and field monitoring was employed. Based on site conditions， the key strata and potential grouting horizons were identified. Surface movement observation stations were established to monitor subsidence under both grouted and non-grouted conditions， and the monitoring data were analyzed.  Results The results show that： (1) Compared with the non-grouted 11010 working face in the same mining area， the movement angle of the 11090 working face under grouting conditions was larger， indicating that grouting effectively reduced the extent of mining-induced subsidence； (2) The isolated working face was affected by adjacent goaf areas. and increasing the grouting-to-mining ratio and grouting volume can effectively protect surface structures and control subsidence； (3) The working face size was an important factor affecting surface subsidence under both grouted and non-grouted conditions； (4) By analyzing the variation characteristics of boundary angles and applying spatial geometry， a calculation formula for the reduction of mining influence area was derived， providing a quantitative basis for evaluating subsidence control by grouting.  Conclusions The findings provide important guidance for the safe and efficient application of overburden separation grouting， as well as for optimizing working face layout parameters.

Key words:overburden separation grouting;mining subsidence;thick coal seam;isolated working face;boundary angle