Gas emission-based determination of the reasonable driving speed in coal roadway

Authors

FU Shuai, School of Civil Aviation, Zhengzhou University of Aeronautics, Zhengzhou 450046, China
SI Qingmin, School of Civil Aviation, Zhengzhou University of Aeronautics, Zhengzhou 450046, China
WANG Qifei, School of Emergency Management and Safety Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China
GUO Xinyao, School of Civil Aviation, Zhengzhou University of Aeronautics, Zhengzhou 450046, China
ZHANG Hongtu, College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, ChinaFollow

Abstract

Scientific determination of the tunneling speed is an important prerequisite for the safe and efficient production in coal mines with high gas and outburst. In order to determine the reasonable driving speed of coal roadway and reduce the occurrence of dynamic disasters in coal roadway driving, the distribution law of gas in roadway head was analyzed, the mathematical model was established. Gas emission characteristics were also analyzed at different driving speeds based on the model. Taking Jinhui Wanfeng Coal Mine as an example, the reasonable driving speed was determined in this coal mine based on its gas emission characteristics. Results show that when the driving speed is equal to the stress migration speed(v=v_σ), the gas emission of fallen coal and the total gas emission are all constant; when the driving speed is less than the stress migration speed(v < v_σ), the gas emission of fallen coal decreases linearly, the total gas emission decreases continuously; when driving speed is greater than the stress migration speed(v>v_σ), the gas emission of fallen coal increase exponentially, the total gas emission decreases continuously; The stress migration speed of working face 1115 in Wanfeng Coal Mine is 2.1 m per shift or 2.4 m, 1.6 m and 2.4 m per shift circularly driving, at this speed the roadway can be safely and fast excavated. The research results were proved at inlet airway 1115 and the feasibility of the method was verified.

Keywords

Jinhui Wanfeng Coal Mine, roadway excavation, gas emission, driving speed, stress migration speed

DOI

10.3969/j.issn.1001-1986.2021.05.008

Recommended Citation

FU Shuai, SI Qingmin, WANG Qifei, et al. (2021) "Gas emission-based determination of the reasonable driving speed in coal roadway," Coal Geology & Exploration: Vol. 49: Iss. 5, Article 9.
DOI: 10.3969/j.issn.1001-1986.2021.05.008
Available at: https://cge.researchcommons.org/journal/vol49/iss5/9

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