Elastic Modulus and Strength of Rock-Like Material with Locked-In Stress

Geng, Hansheng; Xu, Hongfa; Gao, Lei; Chen, Ling; Wang, Bo; Zhao, Xiao Ling

doi:10.1155/2018/5320906

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…In order to better predict rock strength, experts have proposed some rock failure criterions, one of which is the Mohr-Coulomb (M-C) strength criterion, and it has been widely applied in the rock engineering (Geng et al, 2018;Huang et al, 2016;. Based on M-C, the relation between the peak point stress r 1 and the confining pressurer 3 can be expressed as…”

Section: The Strength Propertiesmentioning

confidence: 99%

Constitutive model of rock triaxial damage based on the rock strength statistics

Chen

2020

International Journal of Damage Mechanics

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Firstly, an X-ray diffraction test is carried out to investigate brittle rock specimens’ composition, and a triaxial compression test is conducted to study the deformation behaviors and mechanical properties. Then, assuming that the rock material is able to be divided into the elastic part satisfying the Hooke’s law and the damage part where rock strength follows lognormal distribution, this paper determines a damage variable and establishes a damage constitutive model which effectively reflects the residual strength in the process of rock failure. Meanwhile, testing data are used to validate the reliability of the proposed model in this paper and the dependence of statistic parameters on the confining pressure. Finally, impacts caused by statistic parameters variation on compression strength are analyzed comprehensively, and we also conduct a comparison between this proposed model and other models from other literatures, thereby showing the reliability and rationality of this proposed model. In addition, the research outcomes presented in this paper also can effectively offer significant reference for the development of rock mechanics and rock engineering.

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Section: The Strength Propertiesmentioning

confidence: 99%

Constitutive model of rock triaxial damage based on the rock strength statistics

Chen

2020

International Journal of Damage Mechanics

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“…Locked-in stress within rocks has been extensively studied, particularly their implications in deep mining operations and their impact on geological hazards [23,24]. However, this study aims to deepen our understanding by specifically focusing on the influence of locked-in stress on the mechanical properties of rocks through computational modeling [25].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Impact of Locked-In Stress on Rock Failure Processes and Energy Evolutions

Wang,

Liu,

Liu

et al. 2023

Materials

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Locked-in stress refers to internal stress present within rock formations that can influence the failure process of rocks under specific conditions. A simplified mechanical model is applied, drawing on elasticity and the hypothesis of locked-in stress, to explore the influence of locked-in stress on the mechanical properties of loaded rocks. An analytical solution is obtained for the stress distribution in a failure model of rocks that include locked-in stress. The findings demonstrate that the geometry and orientation of stress inclusions within the rock influence the initiation and propagation of cracks under the combined influence of locked-in stress and high-stress conditions. Moreover, the presence of locked-in stress substantially reduces the rock’s capacity to withstand maximum stress, thereby increasing its susceptibility to reaching a state of failure. The increase in closure stress leads to a significant increase in the magnitude of the maximum stress drop and radial strain variation within the rock, resulting in reduced strength and a shortened life of the ageing failure of the rock. In addition, the influence of stress inclusions on energy dissipation is investigated, and a novel relationship is established between the roughness coefficient of the rock structure surface and the angle of the rock failure surface. This relationship serves to characterize the linear dynamic strength properties of rock materials containing locked-in stress. This investigation not only advances the comprehension of stress distribution patterns and the effects of locked-in stress on rock failure patterns but also facilitates a more precise portrayal of the nonlinear features of alterations in the rock stress-strain curve under the influence of confined stress. These findings provide a solid theoretical foundation for ensuring the safety of excavations in various deep engineering projects.

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“…The residual stress in the geogrid increased with the number of compaction passes. The article (Geng et al 2018) provided a method for studying the lockedin stress in rock-like material using an empirical formula for the strength of rocklike material containing locked-in stress. The equations for the influence of lockedin stress on the strength of rock-like material under uniaxial and triaxial conditions were derived based on the Mohr-Coulomb criterion and effective stress principle.…”

Section: Introductionmentioning

confidence: 99%

Studying the Relation of the Residual Stresses in the Ballast Layer to the Elastic Wave Propagation

Sysyn

Gerber

Liu

et al. 2022

Transp. Infrastruct. Geotech.

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During track construction or ballast bed maintenance, ballast layer compaction quality plays an essential role in the following track irregularity accumulation, its lifecycle, and maintenance costs. The ballast compaction process is characterized by its compaction and the accumulation of the stressed state. The elastic wave propagation methods are an effective way for the identification of the ballast bed compaction properties. The paper presents the theoretical and experimental studies of the ballast consolidation under the vibration loading of the sleeper. The practical laboratory study is given by the 1:2.5 scaled physical model of one sleeper and the corresponding ballast layer box. The measurements of ballast pressure and deformations under the vibration loading in the ballast layer and the photogrammetric recording of the ballast flow are carried out. The measurements demonstrate the accumulation of the residual stresses under the ballast layer. Furthermore, the measurements of elastic wave time of flight (ToF) using the shakers under the sleeper and acceleration sensors under the ballast show the substantial increase of the ToF velocities after the tamping process. Moreover, the distribution of the velocities along the sleeper is spatially inhomogeneous. The numeric simulation using the discrete element method (DEM) of the tamping and the testing processes proves the inhomogeneous wave propagation effect. The modeling shows that the main reason for the wave propagation inhomogeneity is the accumulated residual stress distribution and the minor one – the compaction density. Additionally, a method for identifying wave velocity spatial distribution is developed by wave tracing the inhomogeneous medium. The procedures allow ballast identification in the zones outside the shakers.

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Elastic Modulus and Strength of Rock-Like Material with Locked-In Stress

Cited by 5 publications

References 9 publications

Constitutive model of rock triaxial damage based on the rock strength statistics

Constitutive model of rock triaxial damage based on the rock strength statistics

Numerical Study on the Impact of Locked-In Stress on Rock Failure Processes and Energy Evolutions

Studying the Relation of the Residual Stresses in the Ballast Layer to the Elastic Wave Propagation

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