Frictional Sliding Behaviour of Rough Fracture in Granite Under True Triaxial Loading with Implications for Fault Reactivation

被引:0
作者
Fanzhen Meng
Zhufeng Yue
Muzi Li
Jianhua Han
Qijin Cai
Wei Wang
Dawei Hu
Chuanqing Zhang
机构
[1] Qingdao University of Technology,College of Science
[2] Chinese Academy of Sciences,State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics
来源
Rock Mechanics and Rock Engineering | 2024年 / 57卷
关键词
Fracture slip; Acoustic emission; Failure mode; Deformation; Fault reactivation;
D O I
暂无
中图分类号
学科分类号
摘要
In deep tunnelling, mining and subsurface energy recovery, the reliable estimate of rough fracture (or fault) strength and the potential for reactivation are of vital importance for the assessment of dynamic geo-hazard, such as fault slip rock-burst and induced earthquakes. In this study, true triaxial loading tests were conducted on pre-fractured granite with different orientations to the maximum principal stress, and the fracture slip process was studied with the aid of acoustic emission and deformation monitoring. The reactivation strength was also compared with the theoretical predictions based on the analytical model. Results show that the critical fracture angle for the rock matrix failure and original macro-fracture reactivation is ~ 51°, above which fault slip occurs along the original macro-fracture at a gradually smaller differential stress. The microscopic analysis indicates that new faulting develops traversing the original fracture which becomes more compacted and closed with insignificant damage when the fracture angle is below ~ 44°. The differential stress required for rough fracture reactivation is well predicted by the single plane of weakness theory. In addition, variation of acoustic emission signals (especially AE energy) and deformation along σ3 direction with loading time are very consistent, which can be used to analyse the preparatory and evolutionary process of the fracture reactivation. The stress rate decreases whilst deformation rate increases both from a steady state value to a very large value as the fracture is gradually reactivated, accompanied by the b value decreasing from 1.4–2 to 0.4–0.6, which can be used as precursors for the dynamic fault slip. The findings in the present study will provide new insights into the mechanics of rough fracture reactivation in deep tunnelling, mining and underground resource extraction.
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页码:197 / 217
页数:20
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共 166 条
[1]  
Amitrano D(2012)Variability in the power-law distributions of rupture events: how and why does b-value change Eur Phys J Spec Top 205 199-215
[2]  
Cai W(2022)Three-dimensional stress rotation and control mechanism of deep tunneling incorporating generalized Zhang-Zhu strength-based forward analysis Eng Geol 308 153-168
[3]  
Zhu H(2020)Activation of optimally and unfavourably oriented faults in a uniform local stress field during the 2011 Prague, Oklahoma, sequence Geophys J Int 222 159-3397
[4]  
Liang W(2022)Influences of dynamic normal disturbance and initial shear stress on fault activation characteristics Geomech Geophys Geo-Energy Geo-Resour 8 3385-364
[5]  
Cochran ES(2022)The effect of normal load oscillation amplitude on the frictional behavior of a rough basalt fracture Rock Mech Rock Eng 55 337-2202
[6]  
Skoumal RJ(2020)Cyclic frictional responses of planar joints under cyclic normal load conditions: laboratory tests and numerical simulations Rock Mech Rock Eng 53 2189-812
[7]  
McPhillips D(2021)Experimental study on the velocity-dependent frictional resistance of a rough rock fracture exposed to normal load vibrations Acta Geotech 16 785-518
[8]  
Ross ZE(2004)Damage initiation and propagation in hard rock during tunnelling and the influence of near-face stress rotation Int J Rock Mech Min Sci 41 499-2076
[9]  
Keranen KM(2019)Excavation-induced fault instability: possible causes and implications for seismicity Tunn Undergr Space Technol 92 2061-4339
[10]  
Cui G(2001)Numerical modelling of three-dimension stress rotation ahead of an advancing tunnel face Int J Rock Mech Min Sci 38 4330-4204