Particle simulation of the failure process of brittle rock under triaxial compression

Xia, Ming; Zhou, Keping

doi:10.1007/s12613-010-0350-4

Cited by 29 publications

(11 citation statements)

References 18 publications

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“…Many conventional triaxial tests have shown that rock specimens fracture with a highly uneven plane even though the confining pressure is greater than 20 MPa. However, specimens compressed by Mogi‐type TTAs always manifest a fracture pattern of shearing on a planar fault that is parallel to σ 2 .…”

Section: Discussionmentioning

confidence: 74%

Effect of the intermediate principal stress on the evolution of mudstone permeability under true triaxial compression

et al. 2017

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The changes in the permeability of mudstone specimens under compression with different intermediate principal stresses (σ2) were tested using a true triaxial testing system. The confining pressure and pore pressure were set based on the caprock conditions in a CO2 geological storage project. The measured permeability initially increased and then decreased before the failure of the specimen and reached a peak in the form of a sudden increase during the formation of the fault. The permeability during compression decreased with increasing σ2. However, the higher σ2 caused the ductility of the mudstone to decrease significantly and led to the formation of a fault parallel to the σ2 direction. The increase in permeability during the formation of the fault was notably suppressed by the increase in the confining pressure and decreased with increasing flatness of the fault; the flatness of the fault increased with increasing σ2. Moreover, an empirical function that considers the compressive and dilatant strains was proposed to predict the permeability before the failure of the specimen, and the parameters of this function are only slightly affected by σ2. The results of this study reveal the effect of σ2 on the variation of the permeability of mudstone and help better assess the risk of caprock leakage in injection projects. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 74%

Effect of the intermediate principal stress on the evolution of mudstone permeability under true triaxial compression

et al. 2017

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“…Thus, the numerical method is an alternative to feasibly solve this problem. In previous studies, the bonded particle model (BPM) based on the discrete element method (DEM) was widely used to reproduce the progressive failure behavior of the intact rock [ 29 , 30 , 31 , 32 , 33 , 34 ] and the rock containing flaws under quasi-static loads [ 35 , 36 , 37 ]. These numerical results were in line with experimental results, which indicated that the BPM was able to simulate the progressive failure of the brittle rock.…”

Section: Introductionmentioning

confidence: 99%

Progressive Failure Characteristics of Brittle Rock under High-Strain-Rate Compression Using the Bonded Particle Model

Huang

Zheng

et al. 2020

Materials

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This paper microscopically investigated progressive failure characteristics of brittle rock under high-strain-rate compression using the bonded particle model (BPM). We considered the intact sample and the flawed sample loaded by split Hopkinson pressure bar respectively. Results showed that the progressive failure characteristics of the brittle rock highly depended on the strain rate. The intact sample first experienced in microcracking, then crack coalescing, and finally splitting into fragments. The total number of the micro cracks, the proportion of the shear cracks, the number of fragments and the strain at the peak stress all increased with the increasing strain rate. Also, a transition existed for the failure of the brittle rock from brittleness to ductility as the strain rate increased. For the flawed sample, the microcracking initiation position and the types of the formed macro cracks were influenced by the flaw angle in the initial stage. However, propagation of these early-formed macro cracks were prohibited in the later stages. New micro cracks were produced and then coalesced into diagonal macro cracks which could all form ‘X’-shape failure configuration regardless of the incline angle of the flaw. We explored micromechanics on progressive failure characteristics of the brittle rock under dynamic loads.

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“…Taking experimental study on mechanical properties of rock as an example, Chen et al ( 2016a , b ) conducted a series of conventional triaxial compression tests on granite to investigate the pre-failure damage and found that the damage increases slowly before the reversal of volumetric strain and accelerates quickly afterwards. Xia and Zhou ( 2010 ) studied the failure process of brittle rock under uniaxial and triaxial compression. The results revealed that rock failure is caused by axial splitting under uniaxial compression; as the confining pressure increases, rock failure occurs in a few localized shear planes and the rock mechanical behavior is changed from brittle to ductile.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation and constitutive model for lime mudstone

et al. 2016

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In order to investigate the mechanical properties of lime mudstone, conventional triaxial compression tests under different confining pressures (0, 5, 15 and 20 MPa) are performed on lime mudstone samples. The test results show that, from the overall perspective of variation law, the axial peak stress, axial peak strain and elastic modulus of lime mudstone tend to gradually increase with increasing confining pressure. In the range of tested confining pressure, the variations in axial peak stress and elastic modulus with confining pressure can be described with linear functions; while the variation in axial peak strain with confining pressure can be reflected with a power function. To describe the axial stress–strain behavior in failure process of lime mudstone, a new constitutive model is proposed, with the model characteristics analyzed and the parameter determination method put forward. Compared with Wang’ model, only one parameter n is added to the new model. The comparison of predicted curves from the model and test data indicates that the new model can preferably simulate the strain softening property of lime mudstone and the axial stress–strain response in rock failure process.

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Particle simulation of the failure process of brittle rock under triaxial compression

Cited by 29 publications

References 18 publications

Effect of the intermediate principal stress on the evolution of mudstone permeability under true triaxial compression

Effect of the intermediate principal stress on the evolution of mudstone permeability under true triaxial compression

Progressive Failure Characteristics of Brittle Rock under High-Strain-Rate Compression Using the Bonded Particle Model

Experimental investigation and constitutive model for lime mudstone

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