Fracture analyses of different pre-holed concrete specimens under compression

Haeri, Hadi; Khaloo, Alireza; Marji, Mohammad Fatehi

doi:10.1007/s10409-015-0436-3

Cited by 51 publications

(10 citation statements)

References 48 publications

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“…Apart from the one-cavity model, the coalescence of multiple circular model was also investigated. [23][24][25] Moreover, the fracture evolution of sandstone with a trapezoidal cavity was analyzed using acoustic emission and the digital image correlation technique. 3 Another investigation on rock containing hole-like flaws tested hollow-cylinder rock samples.…”

Section: Introductionmentioning

confidence: 99%

“…Choens et al 22 conducted experiments to study the effects of anisotropy on borehole breakout in shale, and the effect of bedding on hole collapse was revealed. Apart from the one‐cavity model, the coalescence of multiple circular model was also investigated 23–25 . Moreover, the fracture evolution of sandstone with a trapezoidal cavity was analyzed using acoustic emission and the digital image correlation technique 3 …”

Section: Introductionmentioning

confidence: 99%

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Insight into the fracture evolution behavior of pre‐flawed hollow‐cylinder granite under multi‐stage increasing‐amplitude cyclic loads: A lab‐scale testing

Wang

Yang

Han

et al. 2021

Fatigue Fract Eng Mat Struct

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The structural deterioration and associated fracture evolution behavior of preflawed hollow-cylinder granite subjected to multi-stage increasing-amplitude (MSIA) cyclic loads are studied herein. The influences of rock structure on volumetric deformation, damage accumulation, energy dissipation, and failure pattern were investigated. It is shown that the volumetric deformation is relatively large for rock having high flaw angle, and it is the minimum and maximum for rock having a 10 and 70 flaw angle. A damage evolution model that can describe a first fast and then steady damage propagation was proposed based on the irreversible axial strain. Much energy needs to be consumed to drive crack propagation and hole collapse for rock having high angle flaws. A series of 2D computed tomography (CT) images reveal the different crack network pattern and how it is affected by the rock structure. A more complicated crack network is found for rock having a high flaw angle.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Insight into the fracture evolution behavior of pre‐flawed hollow‐cylinder granite under multi‐stage increasing‐amplitude cyclic loads: A lab‐scale testing

Wang

Yang

Han

et al. 2021

Fatigue Fract Eng Mat Struct

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“…Under stress, local stress concentration will occur around the initial defects. Since the tensile strength of the rock is much lower than its compressive strength, tensile cracks may form, resulting in the brittle failure of the rock mass [5]. Under dynamic loading, the small defects in the rock mass will be activated and will connect to form a large connected discontinuous surface [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Dynamic Tensile Mechanical Properties of a Coal Sandstone Disc with a Central Hole

2020

Advances in Civil Engineering

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Deep mine rocks are often subjected to rock burst induced by dynamic load. The existence of initial holes will reduce the mechanical properties of rocks and affect the stability and safety of the tunnel excavating. In order to study the effect of the ratios of inner and outer diameter on disc specimen dynamic mechanical properties and failure modes, we use cylindrical sandstone specimens of Φ50 × 25 mm to process center holes of different diameters, and a series of dynamic splitting test were carried out with a system of split Hopkinson pressure bar (SHPB) with the diameter of Φ50 mm when the pressure is 0.15 MPa, 0.3 MPa, and 0.5 MPa. The results show that (1) the dynamic tensile stress-time-history curve exhibited double peak phenomena, and the second peak value is less than the first peak value, (2) the dynamic tensile stress peaks decrease nonlinearly with the increasing of the ratios of inner and outer diameter, and the dependence is more obvious when the pressure is higher, and (3) there is a tensile crack running along the loading direction in the failure modes of the five samples with the ratio of inner to outer diameter under three kinds of impact pressure. Under the same impact pressure, when the ratio of inner diameter to outer diameter is greater than the critical ratio of inner diameter to outer diameter, there is an obvious empty hole effect; that is, the sample develops secondary tensile cracks that develop from the upper and lower ends of the pore disc to the center of the inner hole. With the increase of the ratio of inner diameter to outer diameter, the width of the penetration crack increases. With the increase of impact pressure, the critical ratio of inner diameter to outer diameter decreases gradually. The research results have certain significance for understanding the mechanical properties of porous rocks.

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“…Based on the experimental results, stress state variations were observed at the crack tip, the crack initiation, propagation, and arresting. Haeri et al performed an uniaxial compression test on a rock‐like specimen that contains three pre‐existing holes. Their experimental results indicated that preholed specimens with different inclination angles had different crack coalescence modes.…”

Section: Introductionmentioning

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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Fracture analyses of different pre-holed concrete specimens under compression

Cited by 51 publications

References 48 publications

Insight into the fracture evolution behavior of pre‐flawed hollow‐cylinder granite under multi‐stage increasing‐amplitude cyclic loads: A lab‐scale testing

Insight into the fracture evolution behavior of pre‐flawed hollow‐cylinder granite under multi‐stage increasing‐amplitude cyclic loads: A lab‐scale testing

Experimental Study of the Dynamic Tensile Mechanical Properties of a Coal Sandstone Disc with a Central Hole

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

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