Distribution and Evolution Law of Void Fraction in the Goaf of Longwall Mining in a Coal Mine: Calculation Method and Numerical Simulation Verification

Wang, Jiaqi; Zhou, Nan; Wang, Chongjing; Li, Meng; Meng, Guohao

doi:10.3390/app13126908

Open AccessArticle

Distribution and Evolution Law of Void Fraction in the Goaf of Longwall Mining in a Coal Mine: Calculation Method and Numerical Simulation Verification

by

Jiaqi Wang

¹,

Nan Zhou

^1,*,

Chongjing Wang

²,

Meng Li

³ and

Guohao Meng

¹

School of Mines, China University of Mining and Technology, Xuzhou 221116, China

²

Jining Energy Development Group Co., Ltd., Jining 272073, China

³

State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China

^*

Author to whom correspondence should be addressed.

Appl. Sci. 2023, 13(12), 6908; https://doi.org/10.3390/app13126908

Submission received: 27 April 2023 / Revised: 27 May 2023 / Accepted: 3 June 2023 / Published: 7 June 2023

(This article belongs to the Special Issue Advances in Failure Mechanism and Numerical Methods for Geomaterials)

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Abstract

Many voids are produced in the mining process of ore-bearing strata. To explore the development law of voids after mining coal-bearing strata, a theoretical model was established to derive the overall distribution and shape of voids in the goaf. The above theory was verified using the numerical calculation method. The turning point of the void change was found. The research results show that the void in the goaf was widely distributed around the stope, and the overall void ratio was affected by the mining conditions, such as the mining height and face length. While advancing the working face, the dynamic development of the void first increased and then decreased. At first, the distribution of the void ratio in the goaf was between 0.293 and 0.889 under specific geological conditions, and then, with the advancement of the working face, a large void ratio was reserved at 0~40 m behind the working face. When the working face was advanced to the first roof collapse length, the void fractures continued to decline. Using the above voids, the backfilling of solid mine waste can be effectively realized, and the ecological environment can be protected.

Keywords: goaf; voids; numerical simulation; gangue; waste management

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MDPI and ACS Style

Wang, J.; Zhou, N.; Wang, C.; Li, M.; Meng, G. Distribution and Evolution Law of Void Fraction in the Goaf of Longwall Mining in a Coal Mine: Calculation Method and Numerical Simulation Verification. Appl. Sci. 2023, 13, 6908. https://doi.org/10.3390/app13126908

AMA Style

Wang J, Zhou N, Wang C, Li M, Meng G. Distribution and Evolution Law of Void Fraction in the Goaf of Longwall Mining in a Coal Mine: Calculation Method and Numerical Simulation Verification. Applied Sciences. 2023; 13(12):6908. https://doi.org/10.3390/app13126908

Chicago/Turabian Style

Wang, Jiaqi, Nan Zhou, Chongjing Wang, Meng Li, and Guohao Meng. 2023. "Distribution and Evolution Law of Void Fraction in the Goaf of Longwall Mining in a Coal Mine: Calculation Method and Numerical Simulation Verification" Applied Sciences 13, no. 12: 6908. https://doi.org/10.3390/app13126908

APA Style

Wang, J., Zhou, N., Wang, C., Li, M., & Meng, G. (2023). Distribution and Evolution Law of Void Fraction in the Goaf of Longwall Mining in a Coal Mine: Calculation Method and Numerical Simulation Verification. Applied Sciences, 13(12), 6908. https://doi.org/10.3390/app13126908

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Distribution and Evolution Law of Void Fraction in the Goaf of Longwall Mining in a Coal Mine: Calculation Method and Numerical Simulation Verification

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