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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 16, issue 12 | Copyright
Nat. Hazards Earth Syst. Sci., 16, 2473-2484, 2016
https://doi.org/10.5194/nhess-16-2473-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 29 Nov 2016

Research article | 29 Nov 2016

Roadway backfill method to prevent geohazards induced by room and pillar mining: a case study in Changxing coal mine, China

Nan Zhou, Meng Li, Jixiong Zhang, and Rui Gao Nan Zhou et al.
  • Key Laboratory of Deep Coal Resource Mining, School of Mines, Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, China

Abstract. Coal mines in the western areas of China experience low mining rates and induce many geohazards when using the room and pillar mining method. In this research, we proposed a roadway backfill method during longwall mining to target these problems. We tested the mechanical properties of the backfill materials to determine a reasonable ratio of backfill materials for the driving roadway during longwall mining. We also introduced the roadway layout and the backfill mining technique required for this method. Based on the effects of the abutment stress from a single roadway driving task, we designed the distance between roadways and a driving and filling sequence for multiple-roadway driving. By doing so, we found the movement characteristics of the strata with quadratic stabilization for backfill mining during roadway driving. Based on this research, the driving and filling sequence of the 3101 working face in Changxing coal mine was optimized to avoid the superimposed influence of mining-induced stress. According to the analysis of the surface monitoring data, the accumulated maximum subsidence is 15mm and the maximum horizontal deformation is 0.8mmm−1, which indicated that the ground basically had no obvious deformation after the implementation of the roadway backfill method at 3101 working face.

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Coal mines in the western areas of China experience low mining rates and induce many geohazards when using the room and pillar mining method. In this research, we proposed a roadway backfill method during longwall mining to target these problems. The surface monitoring data shows that the ground basically had no obvious deformation after the implementation of the roadway backfill method.
Coal mines in the western areas of China experience low mining rates and induce many geohazards...
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