A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

Dai, Bing; He, Guicheng; Zhang, Zhijun

doi:10.1155/2018/2968205

Cited by 7 publications

(2 citation statements)

References 33 publications

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“…Hence, we selected a model size of 100 mm (height) Â50 mm (width) to duplicate the specimen size of the experimental study. More details of the validation procedure is given in Dai et al (2018). After validating the model for intact material, models with cracks and pores were simulated; first, models with a single crack (crack lengths of 10 mm, 20 mm, 30 mm and 40 mm) and a single pore (pore diameters of 4 mm, 8 mm, 12 mm and 16 mm) were simulated.…”

Section: Numerical Simulation Programmentioning

confidence: 99%

Numerical modelling of the crack-pore interaction and damage evolution behaviour of rocklike materials with pre-existing cracks and pores

Wasantha

Yang

et al. 2020

International Journal of Damage Mechanics

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The combined effect of pre-existing cracks and pores on the damage evolution behaviour and mechanical properties of rocklike materials under uniaxial compression was numerically studied. Simulations of cracks and pores alone showed that increasing crack length and pore diameter decrease uniaxial compressive strength (UCS) and elastic modulus. Subsequent simulations considered two types of combinations of pre-existing cracks and pores – two cracks either side of a centric pore, and two pores either side of a centric crack – and the distance between cracks and pores was changed. In the case of two cracks at either side of the pore, UCS increased only slightly when the distance between the cracks and pore was increased. This was attributed to the more profound effect of the presence of the pore on UCS, and was confirmed by the progressive crack development characteristics and the major principal stress distribution patterns, which showed that the cracks initiated from the tips of the two pre-existing cracks made little or no contribution to the ultimate macroscopic failure. In contrast, models with two pores at either side of a centric crack showed a marked dependency of UCS on the distance between the pores and the crack. Cracks propagating from pre-existing pores made a greater contribution to the ultimate macroscopic failure when the pores were close to the centric crack and the effect gradually diminished with increasing space between pre-existing pores and the centric crack. Major principal stress distributions showed an asymmetric mobilisation of compressive stresses at the right and left sides of the two pores, favouring macroscopic shear failure when they were close to the centric crack which had led to a lower UCS. Overall, this study presents some critical insights into crack-pore interaction behaviour and the resulting mechanical response of rocklike materials to assist with the design of rock structures.

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Section: Numerical Simulation Programmentioning

confidence: 99%

Numerical modelling of the crack-pore interaction and damage evolution behaviour of rocklike materials with pre-existing cracks and pores

Wasantha

Yang

et al. 2020

International Journal of Damage Mechanics

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“…Cracks easily initiated at the tips of discontinuity when the angles of inclination were 0°, 30°, and 60°under a series of uniaxial compression tests [8]. Bing et al [9] performed the test on gypsum specimens containing a single discontinuity with length 10 mm-30 mm and different inclination angles 0°-90°. e resulting peak stresses were affected by both factors.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Failure Modes of Rock Specimens with Specific Joint Geometries in Triaxial Unloading Compressive Test

Duan

Zhang

et al. 2019

Advances in Materials Science and Engineering

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The effects of disconnected joints on the mechanical characteristics of rock masses are interesting and challenging aspects of rock mechanics. The prime objective of this study is to investigate the effect of joint orientations and joint connectivity rates on the strength, deformation, and failure mechanisms of rock specimens under unloading condition. To establish the relationships between different factors (confining pressure, joint orientation, and joint connectivity) and failure mechanisms, a series of triaxial unloading tests were performed. The results showed that the joint orientation had a more considerable effect than the joint connectivity on the strength and deformation of the specimens. Generally, three different types of failures were observed (i.e., shear, mixed, and split). Finally, Griffith’s theory was utilized to analyze the maximum tensile stress around the crack. The findings of this paper can also be used for practical engineering problems.

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Feasibility of Artificial Materials in Simulating Rock Failure Based on Rate-Dependent Brittleness Indexes

et al. 2022

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A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

Cited by 7 publications

References 33 publications

Numerical modelling of the crack-pore interaction and damage evolution behaviour of rocklike materials with pre-existing cracks and pores

Numerical modelling of the crack-pore interaction and damage evolution behaviour of rocklike materials with pre-existing cracks and pores

Mechanical Properties and Failure Modes of Rock Specimens with Specific Joint Geometries in Triaxial Unloading Compressive Test

Feasibility of Artificial Materials in Simulating Rock Failure Based on Rate-Dependent Brittleness Indexes

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