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Distribution characteristics of floor pore water pressure based on similarity simulation experiments

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Abstract

To analyse the impact of underground pressure on the variation in floor porosity and pore water pressure distribution during the coal seam mining process, this paper uses closed and open water pressure sensors to analyse rock pressure, water pressure zoning and layer distribution characteristics of the coal seam floor under mining effects based on a simulation analysis method using similar rock materials; the results determine that the separation characteristics of the pore water pressure distribution are affected by the rock pressure ‘barrier’ function, which is caused by changes in rock permeability under the coupling effect. To quantitatively analyse the rock pressure barrier’s impact on the floor mechanical structure, this paper proposes the ‘virtual separation layer’ concept and defines the virtual separation layer index to determine the scope of the floor tension fracture zone. Through monitored data of pore water pressure at different depths of the floor during field mining, the variation between the water pressure, porosity, mining distance and floor depth is obtained; similar material simulation results are verified, and a zonal distribution model of pore water pressure in the floor is established, providing a reference to investigate the distribution of pore water pressure in the floor under mining disturbances. The results show that the influence of changes in mining stress will also lead to a differential distribution of the floor mechanical properties and ultimately damage the floor and affect the inrush of the confined water. The research results play an important role in risk classification and prevention of water pressure distribution in coal seam floors.

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Acknowledgements

Funding was provided by National Key R&D Program of China (2018YFC0604705); SDUST Research Fund (grant 2018TDJH102); National Natural Science Foundation of China (Grant Nos. 51574159 51974172, 51974173, 51804179) and the SDUST Research Fund, Shandong Province Natural Science Foundation Project (ZR2017MEE055; 2018GSF116002; 2019GSF111024); China postdoctoral science foundation (2015M572067, 2016T90662).

Funding

Funding was provided by National Natural Science Foundation of China (grant nos. 51974172, 51974173 and 51804179), SDUST Research Fund, Shandong Province Natural Science Foundation Project (ZR2017MEE055, 2018GSF116002).

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Authors and Affiliations

  1. State Key Laboratory Breeding Base for Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao, 266590, China

    Jinhai Zhao, Juntao Chen, Xinguo Zhang, Jiang Ning & Yunzhao Zhang

  2. College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, 266590, China

    Jinhai Zhao, Juntao Chen, Xinguo Zhang & Jiang Ning

  3. National Demonstration Center for Experimental Mining Engineering Education, Shandong University of Science and Technology, Qingdao, China

    Jinhai Zhao, Juntao Chen & Xinguo Zhang

  4. Shandong ding ’an testing technology co. LTD, Jinan, 250032, China

    Yunzhao Zhang

Authors
  1. Jinhai Zhao
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  2. Juntao Chen
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  3. Xinguo Zhang
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  4. Jiang Ning
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Correspondence to Jinhai Zhao, Juntao Chen or Xinguo Zhang.

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Zhao, J., Chen, J., Zhang, X. et al. Distribution characteristics of floor pore water pressure based on similarity simulation experiments. Bull Eng Geol Environ 79, 4805–4816 (2020). https://doi.org/10.1007/s10064-020-01835-6

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