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Study on surface subsidence prediction method of shallow coal seam backfill-strip mining under the hard roof

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Abstract

Because of the easily caused damage to ground buildings by shallow coal seam mining under the hard roof, backfill-strip mining has been gradually adopted to realize the sustainable development of mining and protection of ground buildings. The surface subsidence prediction method in backfill-strip mining is not clear enough to the shallow coal seam under the hard roof. This paper adopts the numerical simulation method to study the surface movement characteristics of shallow coal seam backfill-strip mining under the hard roof. The results show that the maximum surface subsidence and the stress of the filling body are directly proportional to the width of the caving mining working face in the range of 30 ~ 80 m. The stress of the coal pillars on both sides is unchanged. The thickness from the wave band to the surface conforms to the quadratic function. The characteristics of surface movement conform to the prediction model of the probability integral method. Based on the probability integral method, the superposition calculation method of backfill-strip mining is deduced, and the prediction parameters calculation equation of the whole backfill-strip mining area is given. Finally, 5 backfill-strip mining schemes are designed in combination with the case. According to the protection index and the economic benefits, the best mining scheme is determined. The research results provide a reference for surface subsidence prediction in similar geological conditions.

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Abbreviations

W 0 :

The surface maximum subsidence value of full mining

m :

The thickness of coal seam

q :

Surface subsidence coefficient

α :

Dip angle of coal seam

r :

Major influence radius of the strike direction

ρ :

The design filling rate of the working face

a :

The width of the backfill working face

b :

The width of the caving mining working face

λ :

The recovery rate of the strip mining

H :

The mining depth of coal seam

tanβ :

The tangent of major influence angle

b 0 :

The horizontal movement coefficient

S :

The Inflection point offset

θ 0 :

The propagation angle of extraction

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Funding

This work was funded by the Innovation and Demonstration Program of Geology & Mineral Resources of Shandong Province (Grant No. HJ202206) and the Major Innovation Program of Shandong Province (Grant No. 2022CXGC011403).

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Authors and Affiliations

  1. Shandong Provincial Lunan Geology and Exploration Institute, Jining, 272000, Shandong, China

    Huaizhi Bo, Yuezong Wang, Shaohao Hu & Fanglong Zhang

  2. Technology Innovation Center of Restoration and Reclamation in Mining Induced Subsidence Land, Ministry of Natural Resources, Jining, 272000, Shandong, China

    Huaizhi Bo, Yuezong Wang, Shaohao Hu & Fanglong Zhang

  3. School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China

    Guangli Guo, Huaizhan Li & Qian Jiang

  4. NASG Key Laboratory of Land Environment and Disaster Monitoring, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China

    Guangli Guo, Huaizhan Li & Qian Jiang

Authors
  1. Huaizhi Bo
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  2. Guangli Guo
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Correspondence to Yuezong Wang.

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Bo, H., Guo, G., Li, H. et al. Study on surface subsidence prediction method of shallow coal seam backfill-strip mining under the hard roof. Bull Eng Geol Environ 82, 281 (2023). https://doi.org/10.1007/s10064-023-03284-3

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