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The Location Optimum and Permeability-Enhancing Effect of a Low-Level Shield Rock Roadway

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Abstract

High (low)-level roadways are effective gas control measures for coal seams with high outburst potential and low permeability. The spatial location of the low-level roadway directly determines the gas drainage efficiency and can affect the success of the whole engineering project. Currently, determining the location of a low-level roadway is based mostly on empirical engineering analogies and lacks relevant theoretical support. In this work, based on the Ji-15-24080 engineering project at the No. 10 Coal Mine of **dingshan Tian’an Coal Industry Co., Ltd., a numerical model for the location of a low-level roadway was established using ANSYS numerical software to analyze the stress distribution in the rock surrounding the conveyor roadway for the mining face and assess the permeability-enhancing effect of the low-level roadway when it is placed at different locations. A location directly beneath the conveyor roadway was found to provide a good location for a low-level shield roadway. In addition, a quantitative distance between the conveyor roadway and the low-level roadway can also be determined. These optimization results were then directly applied in the field. Relevant industrial field tests were conducted to determine fracture development, gas pressure and stability of the surrounding rock. The field test results confirm that the proposed location for a low-level shield roadway is reasonable. We recommend that when the low-level shield roadway is placed directly beneath a conveyor roadway, it should be within 50 m of the working face, and an effective support structure should be employed to support the rock surrounding the conveyor roadway to ensure the stability of the rock. We further recommend that, in the area in front of the working face, particularly within 25 m of the working face, densely distributed gas drainage boreholes should be drilled to drain gas from the coal seam to reduce the gas pressure and lower the outburst risk. The results of this work will provide guidance for similar engineering projects to determine the location of a low-level roadway and to ensure gas control.

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Abbreviations

Ji-15-24080, Ji-15, Ji-16, Ji-17:

Working face of coal mine

X1, X2, X3, X4:

Coordinates of the corners of a low-level roadway

V1, V2, V3, V4:

Target study areas of various sizes covering the conveyor roadway and the rock surrounding

PY1, PY2, PY3, PY4:

Coordinates of the corners of each of the analytical areas

σ x :

Horizontal stress

σ y :

Vertical stress

E :

Elastic modulus of the coal mass

μ :

Poisson’s ratio of the coal mass

ω :

A dimensionless quantity (a percentage)

k 0 :

Initial permeability of the fractured coal mass

k :

Permeability of the coal mass in a deformed state

ε v :

Total volumetric strain of the coal mass

η 0 :

Initial porosity

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Funding

Funding was provided by The National Key Research and Development Program of China (Grant No. 2016YFC0600701) and National Natural Science Foundation of China (Grant No. 51674170).

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Authors and Affiliations

  1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, China

    Mingzhong Gao, Zhilong Zhang, Zhilong Zhang, Chuan Xu, Qiang Liu & Hailiang Chen

  2. Key Laboratory of Energy Engineering Safety and Mechanics on Disaster (Sichuan University), Ministry of Education, Chengdu, 610065, China

    Mingzhong Gao, Chuan Xu, Qiang Liu & Hailiang Chen

  3. Changsha Institute of Mining Research Co., Ltd., Changsha, 410012, China

    Yin **angang

Authors
  1. Mingzhong Gao
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  2. Zhilong Zhang
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  3. Yin **angang
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  4. Chuan Xu
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  5. Qiang Liu
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  6. Hailiang Chen
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Correspondence to Zhilong Zhang.

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Gao, M., Zhang, Z., **angang, Y. et al. The Location Optimum and Permeability-Enhancing Effect of a Low-Level Shield Rock Roadway. Rock Mech Rock Eng 51, 2935–2948 (2018). https://doi.org/10.1007/s00603-018-1461-x

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  • DOI: https://doi.org/10.1007/s00603-018-1461-x

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