Experimental Investigation of the Influence of Joint Geometric Configurations on the Mechanical Properties of Intermittent Jointed Rock Models Under Cyclic Uniaxial Compression

Liu, Yi; Dai, Feng; Fan, Pengxian; Xu, Nuwen; Li, Dong

doi:10.1007/s00603-017-1190-6

Cited by 142 publications

(38 citation statements)

References 32 publications

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“…In the design of rock engineering structures, understanding and preventing rock fracture initiation and propagation are significant for maintaining structural stability and for avoiding geologic hazards. [1][2][3] On the other hand, in the rock engineering applications related to cutting, fragmentation, and hydraulic fracturing, methods are sought to improve rock-breaking efficiency. For these purposes, rock fracture mechanics has been established and quickly developed.…”

Section: Introductionmentioning

confidence: 99%

An experimental and theoretical comparison of CCNBD and CCNSCB specimens for determining mode I fracture toughness of rocks

Wei

Dai

Liu

et al. 2017

Fatigue Fract Eng Mat Struct

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The cracked chevron notched Brazilian disc (CCNBD) specimen, suggested by the International Society for Rock Mechanics for testing mode I fracture toughness of rocks, usually yields rather conservative toughness measurements, and the reasons have not been fully explored. In this study, the CCNBD method is compared with the cracked chevron notched semicircular bending (CCNSCB) method in the fracture process zone (FPZ) and its influence on the fracture toughness measurement. Theoretical analysis reveals that the FPZ is longer in the CCNBD specimen than in the CCNSCB specimen using a relatively large support span, the toughness measurement using the former is affected more seriously by the presence of FPZ, and thus the CCNBD method is usually, more or less, conservative compared with the CCNSCB method. These inferences are further validated by experimental results, which indicate that the CCNBD test indeed produces much lower fracture toughness values and even the results of 75‐mm radius CCNBD specimens are still lower than those of 25‐mm radius CCNSCB specimens. Consequently, due to smaller FPZ, the CCNSCB specimen with a relatively large span is more likely to produce comparably accurate or representative toughness value, and it may be more suitable than the CCNBD specimen for the engineering applications that require more representative or less conservative fracture toughness.

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Section: Introductionmentioning

confidence: 99%

An experimental and theoretical comparison of CCNBD and CCNSCB specimens for determining mode I fracture toughness of rocks

Wei

Dai

Liu

et al. 2017

Fatigue Fract Eng Mat Struct

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“…Stress intensity factors are needed to determine the subcritical crack growth parameter m under cyclic loading. The specimens coalesced by shear cracks used the shear crack model to determine the stress intensity factor [26]. A schematic illustration of the shear crack model is shown in Figure 13a.…”

Section: Subcritical Crack Growth Parametersmentioning

confidence: 99%

“…However, crack growth under cyclic loading has not been sufficiently investigated. Most experiments have focused on the fatigue properties of intact rock and the influence of cyclic frequency and strain rates [16][17][18][19][20][21][22][23][24][25][26]. Thus, research related to crack propagation and coalescence under cyclic loading is very rare.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Crack Growth in Rock-Like Materials under Monotonic and Cyclic Loading Conditions

Lee

2020

Applied Sciences

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Experiments with gypsum as a model rock material were conducted to investigate the characteristics of crack growth under monotonic and cyclic loading. The specimens had two pre-existing flaws that were placed at different inclination angle, spacing and continuity. Tensile or wing cracks and secondary or shear cracks were observed in both the monotonic and cyclic tests. Wing cracks or tensile cracks initiated at (or near) the tips of flaws and grew parallel to the loading direction. Secondary or shear cracks occurred after initiation of the wing crack and culminated in a final failure. Secondary cracks started at the tips of flaws and propagated in the colinear direction of flaws or perpendicular to loading. Six types of coalescence were observed. Both the monotonic and cyclic tests showed almost identical coalescence types. Coalescence occurred due to the internal shear cracks in specimens containing colinear flaws, while it occurred through combinations of internal shear cracks, internal wing cracks and tension cracks in specimens with non-colinear flaws. Fatigue cracks occurred in tests under cyclic loads. Finally, the subcritical crack growth parameters under monotonic and cyclic loading were determined. Although there were variations in the parameters, the parameter “n” showed similar values.

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“…Erarslan and Williams [143] conducted the static and cyclic loading test on inclined cracked chevron notched Brazilian disc (CCNBD) specimens, and the experimental results show that the failure load obtained through cyclic loading decreased between 30 and 45% compared with those in static loading. Liu et al Advances in Civil Engineering 13 [63] performed the cyclic uniaxial compression test on jointed rock-like specimens, and the influence of joint geometric parameters such as dip angle, persistency, density, and spacing on mechanical properties of intermittent jointed specimen have been investigated. e test result indicated that the stress-strain curve of jointed rock under cyclic loadings is dominated by its curve under monotonic uniaxial loadings.…”

Section: Cycle Loadingmentioning

confidence: 99%

Crack Initiation, Propagation, and Failure Characteristics of Jointed Rock or Rock‐Like Specimens: A Review

Cao

Lin

Fan

et al. 2019

Advances in Civil Engineering

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Rock masses are heterogeneous materials containing a large number of discontinuities, and the failure of the natural rock mass is induced by the crack propagation and coalescence of discontinuities, especially for the rock mass around tunnel or underground space. Because the deformation or failure process of jointed rock mass exhibits strongly nonlinear characteristics, it is also very difficult to predict the strength and failure modes of the rock mass. Therefore, it is very necessary to study the failure mechanisms of jointed rock mass under different stress conditions. Apart from the stress condition, the discontinuities geometry also has a significant influence on the mechanical behavior of jointed rock mass. Then, substantial, experimental, and numerical efforts have been devoted to the study of crack initiation, propagation, and coalescence of rock or rock-like specimens containing different kinds of joints or fissures. The purpose of this review is to discuss the development and the contribution of the experiment test and numerical simulation in failure behavior of jointed rock or rock-like specimens. Overall, this review can be classified into three parts. It begins by briefly explaining the significance of studying these topics. Afterwards, the experimental and numerical studies on the strength, deformation, and failure characteristics of jointed rock or rock-like materials are carried out and discussed.

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Experimental Investigation of the Influence of Joint Geometric Configurations on the Mechanical Properties of Intermittent Jointed Rock Models Under Cyclic Uniaxial Compression

Cited by 142 publications

References 32 publications

An experimental and theoretical comparison of CCNBD and CCNSCB specimens for determining mode I fracture toughness of rocks

An experimental and theoretical comparison of CCNBD and CCNSCB specimens for determining mode I fracture toughness of rocks

Characteristics of Crack Growth in Rock-Like Materials under Monotonic and Cyclic Loading Conditions

Crack Initiation, Propagation, and Failure Characteristics of Jointed Rock or Rock‐Like Specimens: A Review

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