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Study on Excavation of Water Pump House in Deep Coal Mines in Xinhe

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Abstract

The excavation and support of deep chamber has always been a difficult problem to be solved urgently. Through a case study on the 980 m deep chamber group at Xinhe coal mine of China, the present research conducts theoretical analysis on the excavation-induced failure mechanism associated with the neighboring chambers. Moreover, a suite of construction workflows are optimized based on Flac3D numerical simulation. The optimal construction workflow BA2A3A1A4A5 is determined by minimizing the damage volume VP of the plastic region subsequently. The main chamber and niche of the pump house are supported by combined support, and the non-used support is adopted in the early and late stages of the construction of the pump house. The FLAC3D numerical simulator is adopted here to model the support scheme. Results show that the chamber deformation is effectively controlled at the top, bottom, and both sides. Results from field monitoring indicate that the overall supporting effect to the roadway is decent. In order to design the mining sequence of chamber group, FLAC3D numerical simulation can be used to optimize the scheme, and the combined support method adopted by chamber group is reasonable and feasible, which can effectively control surrounding rock, and has good application value.

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Acknowledgements

This work was supported by the Shandong Natural Science Foundation (ZR2019MEE118), Key R & D project of Shandong Province (2018GGX109004 and 2018GSF120016), and National Key Research and Development Plan (2016YFC0801700 and 2017YFC0805200).

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Authors and Affiliations

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

    Bo Liu, Yansong Zhang, Yuyuan Zhang, Quanli Ma & Xiangbao Meng

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  1. Bo Liu
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  2. Yansong Zhang
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  3. Yuyuan Zhang
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  4. Quanli Ma
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  5. Xiangbao Meng
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Correspondence to Yansong Zhang.

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Liu, B., Zhang, Y., Zhang, Y. et al. Study on Excavation of Water Pump House in Deep Coal Mines in Xinhe. Geotech Geol Eng 38, 5061–5074 (2020). https://doi.org/10.1007/s10706-020-01348-9

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