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Theory and practice on the division of the “water pressure-free zone” in a mining coal seam floor

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Abstract

The article describes how current risk assessment of pressure mining using the “water inrush coefficient method” based on the Down Three Zones Theory is relatively inconsistent with the facts in practice. Based on the Down Three Zones Theory, the intact aquiclude is divided into a water pressure-free zone and a water pressure zone, and four kinds of mining discriminant models containing pressure are summarized by analyzing the influence of the confined groundwater on the intact aquiclude, according to the effect on its spatial characteristics. The relationship between the ratio of water head loss and permeability coefficient in the process of confined water conduction is obtained by building laboratory experiment model, and the height of water pressure zone is determined. The discriminant models are verified using the 81004 working face of the Caozhuang mine field in the Feicheng coalfield. The discriminant model results agree with the actual situation in the field and can be used to evaluate whether a coal seam can be safely mined.

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Acknowledgments

The authors would like to thank the workers of the Department of Geology in the Feicheng coal mine for their field test and data collection.

Funding

This research was financially supported by the National Science Foundation (51778351), SDUST Research Fund (No.2018TDJH101), Scientific Research Development Plan of Colleges and Universities in Shandong Province, and Taishan Scholars Construction Projects Funded by Special Funds.

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Authors and Affiliations

  1. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, Shandong, China

    Longqing Shi, Xingyue Qu, Yue Li, Fuhua Pei & Mei Qiu

  2. Department of Resource and Civil Engineering, Shandong University of Science and Technology, Tai’an, 271019, China

    Xiaoge Yu & Weifu Gao

  3. National Engineering Laboratory for Coalmine Backfilling Mining, Shandong University of Science and Technology, Tai’an, 271019, Shandong, China

    Xiaoge Yu

Authors
  1. Longqing Shi
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  2. Xingyue Qu
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  3. Xiaoge Yu
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  4. Yue Li
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  5. Fuhua Pei
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  6. Mei Qiu
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  7. Weifu Gao
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Correspondence to Xiaoge Yu.

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Responsible Editor: Murat Karakus

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Shi, L., Qu, X., Yu, X. et al. Theory and practice on the division of the “water pressure-free zone” in a mining coal seam floor. Arab J Geosci 13, 1079 (2020). https://doi.org/10.1007/s12517-020-06067-2

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  • DOI: https://doi.org/10.1007/s12517-020-06067-2

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