Study on Bidirectional Blasting Technology for Composite Sandstone Roof in Gob-Side Entry-Retaining Mining Method

Gao, Hainan; Gao, Yubing; Wang, Jiong; Fu, Qiang; Qiao, Bowen; Wei, Xingjian; Zhang, Xingyu

doi:10.3390/app11167524

Open AccessArticle

Study on Bidirectional Blasting Technology for Composite Sandstone Roof in Gob-Side Entry-Retaining Mining Method

by

Hainan Gao

^1,2,

Yubing Gao

^1,2,*,

Jiong Wang

^1,2,

Qiang Fu

^1,2,

Bowen Qiao

^1,2,

Xingjian Wei

^1,2 and

Xingyu Zhang

^1,2

¹

State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China

²

School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China

^*

Author to whom correspondence should be addressed.

Appl. Sci. 2021, 11(16), 7524; https://doi.org/10.3390/app11167524

Submission received: 8 July 2021 / Revised: 30 July 2021 / Accepted: 3 August 2021 / Published: 17 August 2021

(This article belongs to the Special Issue Advances in Geotechnical Engineering Ⅱ)

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Abstract

The traditional gob-side entry-retaining mining method has problems such as difficulty in roof collapse and large deformation of the entry, which may affect the safety of mine production. In this study, we introduced a bidirectional blasting technology (BBT) to make the roof collapse smoothly and to improve the traditional gob-side entry-retaining mining method. A theoretical model of the BBT was established and the stress propagation of the BBT was analyzed by numerical simulation. The gob-side entry-retaining mining method was then applied in a composite sandstone roof condition. Compared with ordinary blasting, the concentrated stress and directional cracks can be generated in the set direction after using the BBT technology. Field monitoring data suggested that the deformation of the retained entry met the requirements of mining, verifying the effectiveness of the proposed technology for composite sandstone roof. The results of the study have an important significance in solving the high pressure and large deformation problems in the coal mine roadway and saving coal resources, which also provided a reference for similar geotechnical mines.

Keywords: bidirectional blasting technology; gob-side entry-retaining; geotechnical engineering; deformation control of entry surrounding rock

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MDPI and ACS Style

Gao, H.; Gao, Y.; Wang, J.; Fu, Q.; Qiao, B.; Wei, X.; Zhang, X. Study on Bidirectional Blasting Technology for Composite Sandstone Roof in Gob-Side Entry-Retaining Mining Method. Appl. Sci. 2021, 11, 7524. https://doi.org/10.3390/app11167524

AMA Style

Gao H, Gao Y, Wang J, Fu Q, Qiao B, Wei X, Zhang X. Study on Bidirectional Blasting Technology for Composite Sandstone Roof in Gob-Side Entry-Retaining Mining Method. Applied Sciences. 2021; 11(16):7524. https://doi.org/10.3390/app11167524

Chicago/Turabian Style

Gao, Hainan, Yubing Gao, Jiong Wang, Qiang Fu, Bowen Qiao, Xingjian Wei, and Xingyu Zhang. 2021. "Study on Bidirectional Blasting Technology for Composite Sandstone Roof in Gob-Side Entry-Retaining Mining Method" Applied Sciences 11, no. 16: 7524. https://doi.org/10.3390/app11167524

APA Style

Gao, H., Gao, Y., Wang, J., Fu, Q., Qiao, B., Wei, X., & Zhang, X. (2021). Study on Bidirectional Blasting Technology for Composite Sandstone Roof in Gob-Side Entry-Retaining Mining Method. Applied Sciences, 11(16), 7524. https://doi.org/10.3390/app11167524

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Study on Bidirectional Blasting Technology for Composite Sandstone Roof in Gob-Side Entry-Retaining Mining Method

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