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Method for Designing the Optimal Sealing Depth in Methane Drainage Boreholes to Realize Efficient Drainage by Minghao Yi; Liang Wang; Congmeng Hao; Qingquan Liu; Zhenyang Wang is a Engineering article available to read on EtoBox.

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## Abstract The purpose of underground methane drainage technology is to prevent methane disasters and enable the efficient use of coal mine methane (CMM), and the sealing depth is a key factor that affects the performance of underground methane drainage. In this work, the layouts of in-seam and crossing boreholes are considered to analyze the stress distribution and failure characteristics of roadway surrounding rock through a numerical simulation and field stress investigation to determine a reasonable sealing depth. The results show that the depths of the plastic and elastic zones in two experimental coal mines are 16 and 20 m respectively. Borehole sealing minimizes the air leakage through the fractures around the roadway when the sealing material covers the failure and plastic zones, and the field test results for CMM drainage at different sealing depths indicate that the CMM drainage efficiency increases with increasing sealing depth but does not change once the sealing depth exceeds the plastic zone. Moreover, sealing in the high-permeability roadway surrounding rock does not have a strong influence on the borehole sealing performance. Considering these findings, a new CMM d

Who reads Method for Designing the Optimal Sealing Depth in Methane Drainage Boreholes to Realize Efficient Drainage?

Author

Minghao Yi; Liang Wang; Congmeng Hao; Qingquan Liu; Zhenyang Wang

Publisher

Springer Science and Business Media LLC

Published

2021

Language

EN

Field

Engineering (Physical Sciences)