Prediction of the height of water flowing fractured zone under subcritical mining based on dimensional analysis

LOU Gaozhong; GUO Wenbing; GAO Jinlong

doi:10.3969/j.issn.1001-1986.2019.03.023

Volume 47 Issue 3

Jun. 2019

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COAL GEOLOGY & EXPLORATION > 2019 > 47(3): 147-153. > DOI: 10.3969/j.issn.1001-1986.2019.03.023

LOU Gaozhong, GUO Wenbing, GAO Jinlong. Prediction of the height of water flowing fractured zone under subcritical mining based on dimensional analysis[J]. COAL GEOLOGY & EXPLORATION, 2019, 47(3): 147-153. DOI: 10.3969/j.issn.1001-1986.2019.03.023

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Prediction of the height of water flowing fractured zone under subcritical mining based on dimensional analysis

1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;
2. Coal Production Safety Collaborative Innovation Center in Henan Province, Jiaozuo 454000, China;
3. No.1 Coal Mine, Pingdingshan Coal Mining Co. Ltd., Pingdingshan 467000, China

Funds:

National Natural Science Foundation of China(51774111)

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Received Date: July 17, 2018
Published Date: June 24, 2019

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Abstract

Abstract

In order to accurately predict the height of water flowing fractured zone under subcritical mining, mining thickness M, mining depth H, inclined length of working face L, dip angle of coal seam α, overburden mechanical properties R, overburden structure characteristics S were selected as the main influencing factors on the height of water flowing fractured zone under subcritical mining. Dimensionless relations between the height of water flowing fractured zone and M, H, L, α, S were established by dimensional analysis. Based on 30 sets of measured data, the optimal function relation of dimensionless relation was obtained by multiple regression. The prediction model is validated with field examples from two subcritical working faces, the prediction values are in good agreement with the measured values, and the relative errors are 3.64% and 2.93% respectively, the prediction accuracy of the prediction model can meet the field requirements of safe production in coal mine.
- subcritical mining,
- height of water flowing fractured zone,
- dimensional analysis,
- multiple regression

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References

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