Numerical Model for the Study of the Strength and Failure Modes of Rock Containing Non-Persistent Joints

Vergara, Maximiliano R.; Jan, Michel Van Sint; Lorig, Loren

doi:10.1007/s00603-015-0824-9

Cited by 56 publications

(12 citation statements)

References 14 publications

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“…The evolution of the mechanical property was closely related to the failure mode according to a previous study of specimen that contains multiple flaws . The relationship between the peak strength and the bridge angle in preholed specimens was very similar to that in preflawed specimens . As shown in Figure D, the peak strength of specimens that contain multiple holes decreased with an increase in the number of holes.…”

Section: Experimental and Numerical Resultssupporting

confidence: 64%

“…38 The relationship between the peak strength and the bridge angle in preholed specimens was very similar to that in preflawed specimens. 39,40 As shown in Figure 5 D, the peak strength of specimens that contain multiple holes decreased with an increase in the number of holes. This finding can be explained by a reduction in the supporting area with an increase in the number of holes.…”

Section: Mechanical Propertiesmentioning

confidence: 81%

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Cracking process of a granite specimen that contains multiple pre‐existing holes under uniaxial compression

Huang

Yang

Tian

2019

Fatigue Fract Eng Mat Struct

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The pre‐existence of openings, which play an important role in the mechanical properties and cracking behaviours of rock, is prevalent in rock mass. The interaction among pre‐existing openings (or holes) complicates the instability problems when rock contains multiple holes. Studying the strength failure behaviour of rock that contains multiple pre‐existing holes contributes to the fundamental knowledge of the excavation and stability of underground rock engineering. In this study, first, a series of uniaxial compression tests were performed on granite specimens that contain multiple small holes to investigate the effect of the geometry of pre‐existing holes on the strength and fracture behaviours of rock. The crack initiation, propagation and coalescence process, and acoustic emission (AE) characteristics were investigated using photographic and AE monitoring. Three failure modes were identified, ie, splitting failure, stepped path failure, and planar failure modes. Second, a set of micromechanical parameters in the PFC3D model were calibrated by comparison with the experimental results of an intact granite specimen. The numerically simulated peak strength, peak strain, and failure mode of preholed specimens were consistent with the experimental results. In accordance with the numerical results, the failure modes of the preholed specimens were dependent on the bridge angle and number of holes. Last, the internal fracture characteristics of numerical specimens were revealed by analyzing the horizontal and vertical cross sections at different positions.

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Section: Experimental and Numerical Resultssupporting

confidence: 64%

Section: Mechanical Propertiesmentioning

confidence: 81%

Cracking process of a granite specimen that contains multiple pre‐existing holes under uniaxial compression

Huang

Yang

Tian

2019

Fatigue Fract Eng Mat Struct

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“…Eberhardt [7] and Wang [8] established a discrete element numerical analysis model of a rock slope with regular joints and a soil-similar slope with weak intercalated layers and analyzed the influences of a joint connectivity rate and a weak surface structure on the slope failure mode. Prudencio [9], Vergara [10], and Ghazvinian [11] achieved some interesting results by analyzing the effects of the rock bridge length and joint length on the fracture form and mechanical properties of a discontinuous jointed rock. Wu [12] built an equivalent rock model that reflects the distributive characteristics of joints to study the mechanical properties of rock mass strength, by means of the particle flow software.…”

Section: State Of the Artmentioning

confidence: 99%

Particle Flow Analysis of the Influences of Joints on Rock Mechanical Properties

Liu¹,

F.²,

Li³

et al. 2016

JESTR

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The failure of natural rock mainly forms along the joint planes; therefore, the existence of joints heavily affects the rock strength. The influences of joints with a different dip angle and cross double joints on rock mass strength were analyzed using theoretical calculation and particle flow PFC2D software to explore the mechanical properties of joints on rock failure. Results show that the strength of a jointed rock has obvious angle-range effects in the uniaxial compression text, and the peak strength of rock specimens is typical of the "U" type with the increase of the joint dip angle. For the rock mass of cross double joints, the rock mass strength is determined by the strength of joints when the joint dip angle of either joint is between 45° and 75°. The rock mass strength is determined by the superposition of the effects of these two joints when the joint dip angles of the two joints are both between 45° and 75°; the influences of joints on the rock mass strength are not obvious when neither of the joint dip angles of the two joints is between 45° and 75°. The conclusions obtained in the study have significant implications for understanding the laws of joint rock strength.

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“…Based on the discrete element software UDEC, Vergara et al [178] studied the mechanical behavior of rock containing parallel nonpersistent joint ( Figure 31). And, the results indicated the large anisotropy in the strength resulting from variation of the joint orientation and lower strength of the specimens was caused by the coalescence of fractures belonging to parallel joint sets.…”

mentioning

confidence: 99%

“…(a) Specimen modeled with UDEC including fictitious and preexisting (nonpersistent) joints with β � 30°. (b) Geometrical parameters of the nonpersistent joints and direction of the principal stresses[178].…”

mentioning

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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Numerical Model for the Study of the Strength and Failure Modes of Rock Containing Non-Persistent Joints

Cited by 56 publications

References 14 publications

Cracking process of a granite specimen that contains multiple pre‐existing holes under uniaxial compression

Cracking process of a granite specimen that contains multiple pre‐existing holes under uniaxial compression

Particle Flow Analysis of the Influences of Joints on Rock Mechanical Properties

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

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