Strength Characteristics and Failure Mechanism of Granite with Cross Cracks at Different Angles Based on DIC Method

Wu, Xu; Zhang, Liyuan; Sun, Jinglai; Guo, Qifeng; Pan, Jiliang; Gao, Jun

doi:10.1155/2022/9144673

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…The results indicated that the dynamic strength of the flawed sandstone increased first and then decreased at a given dynamic strain rate. Wu et al [ 23 ] employed wire cutting equipment to prepare rock samples with different crossed cracks and then used an acoustic emission system and digital image correlation technique to study the fracture process of rock samples under uniaxial compression. It was found that the strength of rock samples with a single crack is generally larger than that of samples with cross cracks, and the strength changes when the angle of the crack is in a “V” shape.…”

Section: Introductionmentioning

confidence: 99%

Constitutive Model for Grouted Rock Mass by Macro-Meso Damage

et al. 2023

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Rock fractures have a significant impact on the stability of geotechnical engineering, and grouting is currently the most commonly used reinforcement method to address this issue. To ensure the stability of grouted rock mass, it is necessary to study its deformation law and mechanical properties. In this study, theoretical analyses and laboratory experiments were conducted, and the fracture width, Weibull model and effective bearing area were introduced to improve the applicability and accuracy of the original damage constitutive model. Moreover, the constitutive model of grouted rock mass was derived by combining it with the mixing law of composite materials. The main conclusions are summarized as follows: (1) Based on macroscopic damage tensor theory, the fracture width parameter was introduced, which effectively described the variation law of macroscopic damage with fracture width to improve the accuracy of the original damage constitutive model. (2) The effective bearing area was used to optimize the original Weibull model to match the stress-strain curve of the rock mass with fractures. (3) The grouting-reinforced rock mass was considered to be a composite material, the original equivalent elastic modulus model was improved by combining macroscopic damage with the Reuss model, and the constitutive damage model of the grouted rock mass was deduced.

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Section: Introductionmentioning

confidence: 99%

Constitutive Model for Grouted Rock Mass by Macro-Meso Damage

et al. 2023

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“…Engineering rock masses are anisotropic heterogeneous geological bodies with numerous joints (Wu et al 2022). These joints greatly weaken the mechanical properties of the rock mass(Shan and Lai 2019; Shi et al 2015; Wang et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Classification optimization of tunnel surrounding rock based on geometric parameter effect of joints

Han

et al. 2023

Preprint

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This research aims to study the relationship between the mechanical properties and failure modes of jointed rock mass and the geometrical parameters of the joint and to optimize the grading of the tunnel surrounding rock according to the test results. The numerical model of the jointed rock mass is established using the discrete element particle flow program PFC2D. An uniaxial compression test simulation is conducted for the joint rock mass, considering that the joint dip angle and joint spacing exist simultaneously. Test results show that when the joint dip angle is 45°, the mechanical properties of the jointed rock mass are the worst, the UCS and elastic modulus are the smallest, and the Poisson’s ratio reaches the maximum. When the joint spacing is large, the joint dip angle leads to failure. With the increase in the joint dip angle from 0° to 45°, the failure mode changes from intact rock mass failure to plane and block failure. The change rule is the opposite when the joint dip angle ranges from 45° to 90°. When the spacing is small, the joint spacing dominates the failure mode. With an increase in spacing, the failure mode changes from an intact rock mass to a plane and block failure mode. Based on the influence of joint geometric parameters on the mechanical properties of the rock mass, the surrounding rock classification method was optimized using the basic quality index of the rock mass (BQ).

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“…In laboratory test research, to study the fracture mechanism of the joined rock mass, Wu et al [15] made rock samples with different cross cracks with wire cutting equipment and studied the failure process of rock samples under uniaxial compression using an acoustic emission system and digital image correlation technology. Zhang et al [16] processed intact granite into prefabricated fractured granite samples with fracture angles of 0, 30, and 45, respectively.…”

Section: Introductionmentioning

confidence: 99%

Study on Freezing-Thawing Failure Process of Natural Damage Sandstone Based on Cellular Automata

Liu

Huang

et al. 2022

Geofluids

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Natural damage such as internal cracks, pores, and discontinuous surfaces of rocks induces the formation, expansion, and interaction of mesofractures until macroscopic failure under the action of freeze-thaw and load. The failure process is the evolution of self-organization and has localization characteristics. The CT scanning test of sandstone with different freezing and thawing cycles was carried out. According to the theory of cellular automata analysis, combined with CT image processing technology, the numerical model of the mesostructure of the sandstone constructed with natural damage, and the numerical simulation test of the Brazilian splitting failure of natural damage sandstone was completed under freezing and thawing. The results show that the combination of CT image processing technology and CASRock numerical simulation software can dynamically describe the whole process of initial damage propagation, new crack generation, and penetration of rock containing natural damage under tension in a freeze-thaw environment. Due to random and disordered natural damage inside the rock, gradually changing to an orderly state under freezing and load, the rock shows discontinuous deformation after the plastic deformation reaches a certain degree and gathers at the initial damage expansion. The fracture process of natural damaged rock under freezing and load has continuous-discontinuous deformation characteristics. The existence of initial rock damage causes the rock’s localized deformation and failure characteristics. The form and size of the initial damage determine the direction of development of the surface of the sandstone fracture and the coalescence of the crack. The initial damage area of sandstone is expanded due to the freeze-thaw cycle. After loading, the local deformation and failure characteristics caused by initial damage have delay characteristics for penetration of the main cracks in the sandstone, which determines the formation and development direction of secondary cracks in the rock failure process.

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Strength Characteristics and Failure Mechanism of Granite with Cross Cracks at Different Angles Based on DIC Method

Cited by 5 publications

References 14 publications

Constitutive Model for Grouted Rock Mass by Macro-Meso Damage

Constitutive Model for Grouted Rock Mass by Macro-Meso Damage

Classification optimization of tunnel surrounding rock based on geometric parameter effect of joints

Study on Freezing-Thawing Failure Process of Natural Damage Sandstone Based on Cellular Automata

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