Title: Surface subsidence control during bag filling mining of super high-water content material in the Handan mining area

Authors: Xufeng Wang; Dongsheng Zhang; Chundong Sun; Yang Wang

Addresses: School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China; Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, Xuzhou, Jiangsu 221116, China; State Key Laboratory of Coal Resources and Safe Mining, Xuzhou, Jiangsu 221116, China ' School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China; Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, Xuzhou, Jiangsu 221116, China; State Key Laboratory of Coal Resources and Safe Mining, Xuzhou, Jiangsu 221116, China ' Jizhong Energy Handan MIG, Handan, Hebei 056002, China ' School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

Abstract: This paper focuses on the analysis of the overburden strata control mechanisms in stopes utilising bag filling mining super high-water content material. The factors affecting the mining-induced surface subsidence were determined, and control methods were applied to improve the filling rates of the working faces. The effects of filling rate changes on overburden failure and surface subsidence were investigated quantitatively using the field data. The results indicate that high filling rates and small changes could improve surface subsidence control. When the filling rate exceeded 86%, a 1% increase in the filling rate could decrease the average surface subsidence speed and distance by 5% and 7%, respectively. According to the current geological conditions of the Handan mining area, surface subsidence was observed as 260 mm at a 92% filling rate. Thus, these surface movements and damage indicators could be used to meet the requirements of I-level building codes and adequately control surface subsidence. [Received: July 28, 2015; Accepted: January 14, 2016]

Keywords: bag filling mining; surrounding rock structure; surface subsidence; filling rates; subsidence control; high-water content materials; China; overburden strata control; coal mining; filling materials.

DOI: 10.1504/IJOGCT.2016.078049

International Journal of Oil, Gas and Coal Technology, 2016 Vol.13 No.1, pp.87 - 102

Received: 25 Apr 2015
Accepted: 09 Dec 2015
Published online: 31 Jul 2016 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article