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

Yun Zhang, Shenggen Cao, Lixin Lan, Rui Gao and Hao Yan
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Yun Zhang: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Shenggen Cao: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Lixin Lan: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Rui Gao: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Hao Yan: School of Mines, China University of Mining & Technology, Xuzhou 221116, China

Energies, 2017, vol. 10, issue 5, 1-13

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.

Keywords: residual coal pillar; shortwall block mining (SBM); height of the water-flowing fissure zone (HWFZ); elastic foundation beam (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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