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Energies 2017, 10(5), 734; doi:10.3390/en10050734

Analysis of Development Pattern of a Water-Flowing Fissure Zone in Shortwall Block Mining

1,2
,
1,2,* , 1,2
,
1,2
and
1,2
1
School of Mines, China University of Mining & Technology, Xuzhou 221116, China
2
Key Laboratory of Deep Coal Resources Mining, Ministry of Education of China, Xuzhou 221116, China
*
Author to whom correspondence should be addressed.
Academic Editor: Tariq Al-Shemmeri
Received: 19 April 2017 / Revised: 8 May 2017 / Accepted: 17 May 2017 / Published: 20 May 2017
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Abstract

In order to effectively recover the residual coal resources, such as coal pillars and irregular coal blocks induced by large-scale extensive mining, in this study, we proposed a shortwall block mining (SBM) technology and examined the development pattern of the water-flowing fissure zone (WFZ) in the overlying strata during the SBM process. By analyzing the overlying rocks’ movement rules in SBM, the main controlling factors affecting the development of the height of the water-flowing fissure zone (HWFZ) determined are as follows: mining height, block length, and the width of the protective coal pillar among the blocks. Moreover, based on the elastic foundation beam theory, the mechanical model for the calculation of HWFZ in SBM was established. Based on the first strength theory, the calculation formula of the development HWFZ was derived. Using this model, the calculated HWFZ after SBM was 50.3 m, whereas the measured heights of the leakage of drilling washing fluid were 47.98 and 50.06 m, respectively. The calculated values almost fit well with the field-measured data, verifying the reliability of the proposed mechanical model. The results of this study can provide a significant reference for enhancing the recovery ratio of coal resources and optimizing water protection mining theory. View Full-Text
Keywords: residual coal pillar; shortwall block mining (SBM); height of the water-flowing fissure zone (HWFZ); elastic foundation beam residual coal pillar; shortwall block mining (SBM); height of the water-flowing fissure zone (HWFZ); elastic foundation beam
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhang, Y.; Cao, S.; Lan, L.; Gao, R.; Yan, H. Analysis of Development Pattern of a Water-Flowing Fissure Zone in Shortwall Block Mining. Energies 2017, 10, 734.

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