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Article

Comprehensive Study on Surrounding Rock Failure Characteristics of Longwall Roadway and Control Techniques

by 1,2, 1,2,*, 1,2, 1,2,3, 1,2, 1,2 and 1,2
1
State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China
2
School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China
3
Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China
*
Author to whom correspondence should be addressed.
Academic Editor: Yosoon Choi
Appl. Sci. 2021, 11(21), 9795; https://doi.org/10.3390/app11219795
Received: 7 September 2021 / Revised: 15 October 2021 / Accepted: 18 October 2021 / Published: 20 October 2021
(This article belongs to the Section Civil Engineering)
Research on underground coal mines has primarily focused on the stability of roadways. Mining activities lead to significant damage to the surrounding rocks and also degrade the support to the roadways. Considering the 21309 roadway of the Huojitu coal mine as a case study, this work comprehensively analyzed the characteristics of the surrounding rock using three methods: theoretical calculations, FLAC3D numerical modeling, and field observations. The results indicate that, under the influence of secondary mining, the failure range and stress concentration degree of the surrounding rock are considerably higher than those under the influence of primary mining. In this case, the maximum damage range in the surrounding rock can reach 1.8 m, the maximum principal stress can reach 19.82 MPa, and the ratio of the maximum principal stress to the minimum principal stress can reach 1.95. According to the results, the previous support design for roadways was optimized and applied in the field. Field monitoring revealed that the roadway deformation was effectively controlled, and the optimized support design was safe and reliable. This study is expected to serve as a reference for support designs or optimization under similar geological conditions. View Full-Text
Keywords: longwall mining; roadway stability; mining rock mechanics; numerical modeling longwall mining; roadway stability; mining rock mechanics; numerical modeling
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MDPI and ACS Style

Yang, X.; Yang, G.; Huang, R.; Wang, Y.; Liu, J.; Zhang, J.; Hou, S. Comprehensive Study on Surrounding Rock Failure Characteristics of Longwall Roadway and Control Techniques. Appl. Sci. 2021, 11, 9795. https://doi.org/10.3390/app11219795

AMA Style

Yang X, Yang G, Huang R, Wang Y, Liu J, Zhang J, Hou S. Comprehensive Study on Surrounding Rock Failure Characteristics of Longwall Roadway and Control Techniques. Applied Sciences. 2021; 11(21):9795. https://doi.org/10.3390/app11219795

Chicago/Turabian Style

Yang, Xiaojie, Gang Yang, Ruifeng Huang, Yajun Wang, Jianning Liu, Jun Zhang, and Shilin Hou. 2021. "Comprehensive Study on Surrounding Rock Failure Characteristics of Longwall Roadway and Control Techniques" Applied Sciences 11, no. 21: 9795. https://doi.org/10.3390/app11219795

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