Crack coalescence behavior of sandstone specimen containing two pre-existing flaws under different confining pressures

Huang, Yan‐Hua; Yang, Sheng‐Qi; Tian, Wen‐Ling

doi:10.1016/j.tafmec.2018.11.013

Cited by 107 publications

(29 citation statements)

References 51 publications

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“…In stage IV, the cracks penetrate into one another, and the damage develops rapidly. The above four stages have been observed using acoustic emission or scanning electron microscopy in some previous literature (Huang et al 2019;Zhang et al 2018). Figure 3 illustrates the deviatoric stress versus the axial strain curves of the sealed and unsealed RPC samples under different confining pressures.…”

Section: Stress-strain Relationshipmentioning

confidence: 85%

Effect of Pressurized Oil on the Mechanical Properties of Reactive Powder Concrete

Wang

2020

ACT

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Section: Stress-strain Relationshipmentioning

confidence: 85%

Effect of Pressurized Oil on the Mechanical Properties of Reactive Powder Concrete

Wang

2020

ACT

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“…Second, in the laboratory experiment, CT scanning can be performed to capture the internal crack distribution under loading. The CT observation can be quantitatively compared with the numerical cross section . Third, in the numerical simulation, a finer numerical model should be developed, which considers the irregular grain boundary, finer size, and mineral components, to match the real rock material.…”

Section: Discussionmentioning

confidence: 99%

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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“…PFC software was used to simulate slip and fracture characteristics of CRCS, and the size of the model was determined to be φ50 mm × 120 mm based on the ISRM standard for a uniaxial compression test . The parallel bonds, one type of microbond models in PFC, can transmit both forces and moments between particles/balls and can simulate the mechanical behavior of brittle rock . Particularly, the linear parallel bond model can better represent intact rock properties .…”

Section: Numerical Analysis Of Slip and Instability Of Crcs Under Coumentioning

confidence: 99%

Slip and instability mechanisms of coal‐rock parting‐coal structure (CRCS) under coupled dynamic and static loading

Liu

et al. 2019

Energy Science & Engineering

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The slip and instability mechanisms of coal‐rock parting‐coal structure (CRCS) under coupled dynamic and static loading were investigated using theoretical analysis and numerical simulations, and the fracture and instability processes were described by monitoring the displacement, strain, and acoustic emissions (AEs) of coal and rock parting blocks. Based on the parameters of dynamic load, three different effects on slip and instability characteristics of CRCS were presented, and the effect mechanisms of static stress, as well as amplitude and frequency of dynamic stress wave, were analyzed in detail. Finally, the direct effect on the slip and instability strength of CRCS and the frequency range of dynamic load for generating synchronous slip along two discontinuities sandwiched between coal and rock parting blocks were discussed. This work is relevant for early warning coal‐rock dynamic disasters that are triggered by the slip and fracture instability of CRCS under coupled dynamic and static loading in coal mines.

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Crack coalescence behavior of sandstone specimen containing two pre-existing flaws under different confining pressures

Cited by 107 publications

References 51 publications

Effect of Pressurized Oil on the Mechanical Properties of Reactive Powder Concrete

Effect of Pressurized Oil on the Mechanical Properties of Reactive Powder Concrete

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

Slip and instability mechanisms of coal‐rock parting‐coal structure (CRCS) under coupled dynamic and static loading

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