New Technology of Pressure Relief Control in Soft Coal Roadways with Deep, Violent Mining and Large Deformation: A Key Study

Shengrong Xie, Hui Li, Dongdong Chen (), Shaohua Feng, Xiang Ma, Zaisheng Jiang and Junqi Cui
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Shengrong Xie: School of Energy and Mining Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China
Hui Li: School of Energy and Mining Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China
Dongdong Chen: School of Energy and Mining Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China
Shaohua Feng: School of Energy and Mining Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China
Xiang Ma: School of Energy and Mining Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China
Zaisheng Jiang: School of Energy and Mining Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China
Junqi Cui: School of Energy and Mining Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China

Energies, 2022, vol. 15, issue 23, 1-26

Abstract: Previous studies have shown that the influence of deep dynamic pressure on the surrounding rock control of a coal roadway is one of the difficulties in mine roadway support. Based on the investigation of the headgate 11231 in a coal mine, this study analyzes the damage characteristics of coal roadway surrounding rock affected by deep dynamic pressure, expounds on the difficulties of controlling the roadway surrounding rock, and creatively proposes a cooperative control technology of external anchor–internal unloading for regulating large deformation of roadways. The vertical stress distribution and transfer law of surrounding rock with different hole-making depths, spacing, and lengths after roadway excavation were simulated and studied, and an appropriate parameter range of hole-making space in the stage without dynamic pressure influence was obtained. Considering the influence of mining dynamic pressure, the surrounding rock pressure relief effect of each optimized hole-making parameter was analyzed. In addition, the optimal hole-making parameters (the hole-making depth, spacing, and length were 8 m, 3.2 m, and 3 m, respectively) that can effectively reduce the high stress of roadway shallow surrounding rock in two stages (without and with dynamic pressure) and ensure integrity of the shallow surrounding rock were obtained. The actual field application shows that the new technology can reduce the higher rib deformation by approximately 850 mm and achieve a good surrounding rock control effect. The research and practice show that the pressure relief control for soft coal roadways with deep, violent mining and large deformation has achieved success, providing technical support for the maintenance of the same type of roadway.

Keywords: deep mine; coal roadway; numerical simulation; pressure relief; external anchor–internal unloading; surrounding rock control technology (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: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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