Experimental Study on Pressure Relief Mechanism of Variable-Diameter Borehole and Energy Evolution Characteristics of the Surrounding Rock

Yangyang Li, Rongwei Guo, Shichuan Zhang, Bing Chen (), Haodong Yan, Wenhang Meng and Dan Zheng
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Yangyang Li: Construction of National Key Laboratory Training Base by Ministry of Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China
Rongwei Guo: Construction of National Key Laboratory Training Base by Ministry of Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China
Shichuan Zhang: Construction of National Key Laboratory Training Base by Ministry of Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China
Bing Chen: Construction of National Key Laboratory Training Base by Ministry of Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China
Haodong Yan: Construction of National Key Laboratory Training Base by Ministry of Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China
Wenhang Meng: Construction of National Key Laboratory Training Base by Ministry of Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China
Dan Zheng: Construction of National Key Laboratory Training Base by Ministry of Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China

Energies, 2022, vol. 15, issue 18, 1-14

Abstract: Conventional borehole pressure relief can meet the requirements for preventing rock bursts, but it can also easily destroy the roadway, resulting in system support failure. Taking coal-like samples with boreholes as the research object, the pressure relief effects of the same-diameter boreholes and variable-diameter boreholes are compared and analyzed by a uniaxial compression test. The joint pressure relief mechanism of the variable-diameter drilling hole is discussed. The experimental results show that the stress–strain curve of variable-diameter drilling sample occurred the phenomenon of pre-peak stress drop and post-peak stress plateau, which indicates that the variable-diameter drilling hole can enhance the plastic characteristics of coal-like samples. The borehole size dramatically influences the variation of various pressure relief indexes. The evolution law of AE counting the pre-peak and post-peak of borehole samples verified the abovementioned law. Variable-diameter drilling can enhance the plasticity of samples, weaken the brittleness and reduce the impact tendency. Under the maximum size of the variable-diameter drilling hole and the same-diameter drilling hole is same, the pressure relief effect is more significant. The results obtained in this paper can provide a new theoretical basis and technical guidance for borehole pressure relief and roadway support.

Keywords: rock bursts; drilling pressure relief; energy evolution; variable-diameter drilling; failure characteristics (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
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