New insights into the fracture evolution and instability warning predication for fissure-contained hollow-cylinder granite with different hole diameter under multi-stage cyclic loads

Wang, Yu; Han, Jiajun; Xia, Yingjie; Long, Dayu

doi:10.1016/j.tafmec.2022.103363

Cited by 35 publications

(24 citation statements)

References 37 publications

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“…Typical axial and radial stress strain curves for rock having hole diameters of 10, 15, 20, and 25 mm are cited from the previous investigations, 29 and presented in Figure 2. The axial stress strain curves were partially magnified to observe its deformation pattern.…”

Section: Results and Analysesmentioning

confidence: 99%

Acoustic emission and computed tomography investigation on fatigue failure of fissure‐contained hollow‐cylinder granite: Cavity diameter effect

Wang¹,

Yi²,

Han

et al. 2022

Fatigue Fract Eng Mat Struct

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This work aims to investigate the influence of cavity diameter on fracture behaviors for fissure-contained hollow-cylinder granite subjected to multistage cyclic loads, using acoustic emission detection, and post-test computed tomography (CT) scanning. The influence of the cavity diameter on rock fracture was revealed in terms of volumetric deformation, stiffness degradation, AE output activities, hole spalling, and crack coalescence pattern.The testing results show the both the volumetric strain and AE b value decrease with increasing cavity diameter. An increase of volumetric strain and a decrease of AE b value are found during rock failure and their relationship was established. In addition, damage is quantificationally characterized by the released energy, and a damage evolution model is defined to characterize rock damage process. Moreover, post-test CT visualization highlights the communication between the hole and fissures at the rock bridge segment, and it is suggested that failure severity decreases with the increase of hole diameter.

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Section: Results and Analysesmentioning

confidence: 99%

Acoustic emission and computed tomography investigation on fatigue failure of fissure‐contained hollow‐cylinder granite: Cavity diameter effect

Wang¹,

Yi²,

Han

et al. 2022

Fatigue Fract Eng Mat Struct

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“…Frost heaving force is easily formed in the interfaces, pores, and microcracks, which leads to damage propagation, aperture growth and length increase, and the bimrock structure deterioration. Besides, in geotechnical engineering, for example, mining and civil engineering, disturbed stress is inevitable in the process of rock mass construction; 25–28 the disturbed stress conditions improve the reactivation of fault bands. Although large number of attempts have been carried out on rock fracture and instability behaviors under cyclic or fatigue loads, most of the investigations are focused on fissure‐contained 29,30 or cavity‐contained rock mass 31–33 .…”

Section: Introductionmentioning

confidence: 99%

Macro‐meso damage cracking and volumetric dilatancy of fault block‐in‐matrix rocks induced by freeze–thaw‐multistage constant amplitude cyclic (F‐T‐MSCAC) loads

Wang

Cai

et al. 2022

Fatigue Fract Eng Mat Struct

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In this study, we experimentally investigated the mechanical behaviors of a fault unwelded bimrock exposed to first freeze-thaw weathering and then disturbed stress conditions. The impact of freeze-thaw damage on volumetric deformation, damage propagation, and mesoscopic instability mode was studied. Test results show that the block-matrix interface cracking easily occurs after freeze-thaw treatment. The strain rate increases with the increase of the freeze-thaw cycle, and an early instability precursor is issued from the evolution of volumetric strain rare. In addition, a coupled evolution model considering the mechanical damage and the freeze-thaw weathering damage was defined, and it was suggested that the model pattern has obviously correlation with the occurrence of freeze-thaw damage. Moreover, posttest CT scanning revealed the influence of freeze-thaw on meso-cracking and volumetric dilatancy pattern. It is found that the block contact, interlocking, occlusion, and separation contribute a lot to bimrock volumetric expansion.

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“…The threedimensional stress is the occurrence condition of the fractured rock mass, and the fracture dip angle is the geometric state of the fracture itself. These two aspects have mutual influence on the slurry migration in the fracture and are a pair of coupling factors [39][40][41][42][43][44]. In a word, the slurry diffusion in the fractured rock body needs to consider the slurry diffusion mechanism in the fractured rock body with different dip angles under the three-dimensional stress environment, which is the research direction that meets the needs of the project.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Grouting Seepage Characteristics of Single-Fractured Rock Masses with Different Inclination Angles under Three-Dimensional Stress

Zhu

Han

2022

Geofluids

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In underground engineering, the fracture dip angle and three-dimensional stress have great influence on the permeability and mechanical properties of fractured rock mass. Firstly, single-fracture samples with similar three-dimensional fractal dimensions and different dip angles were selected by using CT scanning technology. Then, the grouting material seepage tests under different dip angles and different three-dimensional stresses were carried out by self-developed single-fracture stress-seepage coupling true triaxial test system. The experimental data of stress-strain curve, grouting pressure, and grouting material flow rate of single-fracture specimen under different fracture dip angles and three-dimensional stress were obtained. The results show that the three-dimensional fractal dimension can be used as an index to measure the influence of fracture factors on grouting seepage test. The third principal stress σ 3 had a greater influence on the fracture width than the first principal stress σ 1 . The larger the fracture inclination, the lower the strength of the single-fracture specimen. As the third principal stress σ 3 increases, the grouting pressure increased while the grouting flow decreased. With the increase of the fracture inclination angle, the influence of σ 1 on the hydraulic conductivity became larger, while the influence of σ 3 on the hydraulic conductivity became smaller. Moreover, the expression of hydraulic conductivity of single-fracture specimen with different dip angles under three-dimensional stress was obtained by nonlinear fitting of hydraulic conductivity data.

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New insights into the fracture evolution and instability warning predication for fissure-contained hollow-cylinder granite with different hole diameter under multi-stage cyclic loads

Cited by 35 publications

References 37 publications

Acoustic emission and computed tomography investigation on fatigue failure of fissure‐contained hollow‐cylinder granite: Cavity diameter effect

Acoustic emission and computed tomography investigation on fatigue failure of fissure‐contained hollow‐cylinder granite: Cavity diameter effect

Macro‐meso damage cracking and volumetric dilatancy of fault block‐in‐matrix rocks induced by freeze–thaw‐multistage constant amplitude cyclic (F‐T‐MSCAC) loads

Experimental Study on Grouting Seepage Characteristics of Single-Fractured Rock Masses with Different Inclination Angles under Three-Dimensional Stress

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