Study on the influence of fracture dip angle on mechanical and acoustic emission characteristics of deep granite

Xiqi Liu, Gang Wang (), Leibo Song, Rong Hu, Xiaoming Ma, Xiaoping Ou and Shiji Zhong
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Xiqi Liu: Wuhan University
Gang Wang: Wuhan University
Leibo Song: Shaoxing University
Rong Hu: University of South China
Xiaoming Ma: Huahui Engineering Design Group Co., Ltd.
Xiaoping Ou: China Gezhouba Group No. 1 Engineering Co., Ltd.
Shiji Zhong: China Gezhouba Group No. 1 Engineering Co., Ltd.

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2023, vol. 118, issue 1, No 4, 95-116

Abstract: Abstract To study the influence of fracture dip angle on the mechanical properties and fracture evolution mechanism of granite under triaxial stress state, MTS 815 mechanics test system was used to conduct triaxial tests on granite with different fracture dip angles, and PCI–II acoustic emission (AE) system was used to monitor the whole process information. The results show that the brittle characteristics of fractured samples with 30°, 45° and 60° dip angles are obviously weakened, while the plastic characteristics are enhanced. The fractures destroy the structural integrity of rock, resulting in the reduction of rock resistance to load and deformation. With the increase in fracture dip angles from 0° to 90°, the compressive strength and elastic modulus of rock samples show a nearly "U"-shaped changing trend of decreasing first and then increasing, and the deterioration ratio coefficients are 7.8 ~ 43.3% and 7.5 ~ 66.9%, respectively. Due to the difference of fracture dip angles, the failure of granite sample shows two modes: "through-cutting fracture surface failure" and "shear failure along fracture surface." It mainly depends on the angle between fracture surface and maximum principal stress. The fracture dip angle affects the variation law of AE signals during the fracture process. Especially for the fractured rock samples with 30°, 45° and 60° dip angles, the AE ring count and energy show obvious "migration" phenomenon, and the signal concentration distribution area is widened and moved backward. With the increase in dip angle, the active degree of rock fracture decreases at first and then increases.

Keywords: Rock mechanics; Fracture dip angle; Triaxial compression; Mechanical properties; Acoustic emission characteristics (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s11069-023-05994-z

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