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A Trapezoidal Three-Dimensional Model for Gas Extraction Based on Shapes of Caved Overlying Strata and Numerical Calculation

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Abstract

Gas emission from the working face in a gas-bearing coal seam impairs safe production. Especially in the coal face, influenced by mining, pressure-relief gas in adjacent seams flows into the working face through the goaf. Moreover, caved overlying strata in different regions show differences in pore and seepage characteristics. Thus, the caving of overlying strata in the goaf of a working face was explored by carrying out physical similarity simulation. Then, based on the characteristics of the geometric shapes of caved overlying strata after mining, a trapezoidal three-dimensional model for gas extraction was established. According to the calculation result, the parameters of field high-level boreholes were optimized. Then, the controllability of gas concentration at the working face after gas extraction was assessed by applying statistical process control. The result showed that after the observed surface of the physical similarity model was lightened, it was more favorable for conducting the test. Moreover, the maximum gas concentration in the goaf was negatively correlated with the diameter of high-level boreholes and the negative pressure for gas extraction. A statistical process control chart revealed that the gas concentrations at the working face were safe after gas extraction based on high-level boreholes, which also validated the feasibility and effectiveness of the model.

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Acknowledgments

This work was supported by National Key R&D Program of China (2018YFC0808303), the Basic and Frontier Research Projects of Chongqing (cstc2016jcyjA0117, cstc2018jcyjAX0626), the Fundamental Research Funds for the Central Universities (2017CDJQJ248825), the State Key Laboratory Cultivation Base for Gas Geology and Gas Control (Henan Polytechnic University) (WS2019B02), Natural Science Foundation of Chongqing, China (cstc2019jcyj-bsh0041), and the Postdoctoral Science Foundation Project Funded by State Key Laboratory of Coal Mine Disaster Dynamics and Control (2011DA105287-BH201903).

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Authors and Affiliations

  1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing University, Chongqing, 400044, China

    Pan Wei, Xuelong Li, Qianting Hu, Shoujian Peng & Shu Liu

  2. Institute of Mining, Clausthal University of Technology, 38678, Clausthal-Zellerfeld, Germany

    Pan Wei

  3. Henan Key Laboratory for Green and Efficient Mining and Comprehensive Utilization of Mineral Resources, Henan Polytechnic University, Jiaozuo, 454000, Henan, China

    Xuelong Li

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  1. Pan Wei
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Correspondence to Qianting Hu or Shoujian Peng.

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Wei, P., Li, X., Hu, Q. et al. A Trapezoidal Three-Dimensional Model for Gas Extraction Based on Shapes of Caved Overlying Strata and Numerical Calculation. Nat Resour Res 29, 4031–4051 (2020). https://doi.org/10.1007/s11053-020-09677-5

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