Study on the Pressure Relief Mechanism and Engineering Application of Segmented Enlarged-Diameter Boreholes

Shitan Gu, Changpeng Chen, Bangyou Jiang, Ke Ding and Huajian Xiao
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Shitan Gu: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Changpeng Chen: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Bangyou Jiang: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Ke Ding: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
Huajian Xiao: Tiandi (Changzhou) Automation Co., Ltd., Changzhou 213000, China

Sustainability, 2022, vol. 14, issue 9, 1-22

Abstract: Ensuring the stability of surrounding rock while conducting pressure relief is key to roadway stability control and preventing rock burst. In this paper, segmented enlarged-diameter borehole destressing technology is proposed. The stress distribution around the borehole is analysed based on the theory of elasto-plastic mechanics, and the mechanism of pressure relief for segmented enlarged-diameter boreholes is studied. Secondly, The effects of the diameter of enlarged-diameter section, length of the enlarged-diameter section, and borehole space on pressure relief and roadway deformation were investigated. Finally, the optimal drilling parameters for Tangkou coal mine 6307 working face are analysed. The key parameters of segmented enlarged-diameter borehole pressure relief technology for the 6307 working face were determined and applied in field practice. Field monitoring results showed that the accumulated energy can be effectively reduced using segmented enlarged-diameter pressure relief boreholes, effectively controlling roadway deformation and providing reference for rock burst prevention and roadway stability control.

Keywords: rock burst; pressure relief; deformation; segmented enlarged-diameter borehole (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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