Dual-damage constitutive model to define thermal damage in rock

Liu, Liyuan; Ji, Hong; Elsworth, D.; Zhi, Sheng; Lv, Xiangfeng; Wang, Tao

doi:10.1016/j.ijrmms.2019.104185

Cited by 55 publications

(17 citation statements)

References 35 publications

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“…Nasseri et al 1 analyzed the damage and permeability characteristics of limestone at 25 C and 150 C. They found that the permeability of the sample first decreased and then increased after compaction and the appearance of axial cracks. Liu et al 3 proposed a thermodynamic model to analyze the change characteristics of the mechanical properties of rocks during thermal treatment. This model explains the nonproportional relationship between peak strength and peak strain well.…”

Section: Introductionmentioning

confidence: 99%

Creep damage behaviors of red sandstone subjected to uniaxial compression after high‐temperature heat treatment using acoustic emission technology

Pan

Berto

Zhou

2021

Fatigue Fract Eng Mat Struct

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This work discusses the results from tests conducted to investigate the uniaxial compression and creep behavior of red sandstone. An original untreated sample and an 800°C treated sample were selected to carry out the experiments. High temperature had an obvious influence on the mechanical properties of the red sandstone. The relationship between creep strain and instantaneous strain, as well as the instantaneous deformation modulus and creep viscosity coefficient, was analyzed. High temperature reduced the ability of the red sandstone to resist instantaneous deformation and creep deformation. Acoustic emission (AE) technology was also used in the loading process of uniaxial compression and creep tests, providing a powerful means for damage evolutionary analysis of the red sandstone.

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Section: Introductionmentioning

confidence: 99%

Creep damage behaviors of red sandstone subjected to uniaxial compression after high‐temperature heat treatment using acoustic emission technology

Pan

Berto

Zhou

2021

Fatigue Fract Eng Mat Struct

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“…In this paper, it is assumed that the rock material macroscopically satisfies the isotropic condition. Meanwhile, since the Weibull probability distribution is easy to integrate and the mean value is greater than 0, it satisfies the statistical characteristics of rock damage under pressure (Liu et al., 2020). Thus, we assume that the material micro-element strength ( k ) obeys the Weibull distribution, and its probability density function can be expressed as: where k represents the micro-element strength.…”

Section: Statistical Damage Constitutive Modelmentioning

confidence: 99%

Study on mechanical properties and statistical damage constitutive model of red sandstone after heating and water-cooling cycles

Jiang

Zhang

et al. 2022

International Journal of Damage Mechanics

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The repeated action of high temperature and water cooling will have a strong deteriorating effect on the mechanical properties of the rock, which will eventually lead to the damage and cracking of the rock. In order to study the influence of heating and water-cooling cycles on rocks, the P-wave velocity and mechanical properties of red sandstone after heating and water-cooling cycles were tested. Meanwhile, based on the Weibull distribution theory, a statistical damage constitutive model based on Mohr-Coulomb strength criterion considering the effects of heating and water-cooling cycles was established, and verified based on the results of triaxial tests. The results show that the P-wave velocity and peak intensity decrease with the temperature under the same number of cycles. The elastic modulus will decrease with the temperature and the number of cycles, indicating that the red sandstone will gradually soften and the ductility will increase under repeated high temperature and water-cooling cycles. And the model can well reflect the stress-strain curves of different high temperature and water-cooling cycles. The research results can provide analytical theories and methods for geothermal development projects.

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“…In addition to theoretical and experimental studies, in actual geothermal exploitation projects, cold water is injected into hot wells, the heat exchange between cold water and hot rock will also have a strong temperature impact on the hot rock, and the induced fractures will help to increase the heat exchange channel and improve the heat recovery efficiency [23]. In addition, cold water will also dash against the geothermal well wall, resulting in the phenomenon of well wall fracture and hole collapse, which affects the safe application and economic benefits of geothermal wells [24].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Effect of Temperature Changes on the Physical Field of Surrounding Rock in a Deep Gold Mine

Guo

Ren

et al. 2021

Advances in Materials Science and Engineering

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To explore the fracture mechanism of surrounding rock for thermal-mechanical coupling in deep mining, the theoretical solution of the internal temperature and stress evolution of the underground chamber cold boundary subjected to cold impact was obtained by thermoelastic theory. The conduction law of temperature and the evolution characteristics of stress were studied by theoretical formulas, and the influence of the convective heat transfer coefficient on the rate of tensile stress reduction was analyzed. The results show that the theoretical solution is in good agreement with the field measured value, which proves that the theoretical calculation method adopted in this paper is reliable and accurate. When the surface of the underground chamber is impacted by the change of temperature, the cold boundary temperature drops sharply at first, then gradually slows down, and finally reaches the same temperature as the air; the tensile stress decreases sharply from the initial high-stress value, then gradually decreases, and finally tends to be stable. The effects of different convective heat transfer coefficients on the change of temperature resistance of rocks were considered by numerical simulation. The numerical simulation results show that increasing the convective heat transfer coefficient not only increases the tensile stress of the heat transfer boundary but also increases the possibility of cracks, which makes the rock easier to crack. Based on the research results, we introduced the thermal-mechanical coupling disturbance range coefficient β = L/2D (β = 6–8) and proposed that the convective heat transfer coefficient is the reference index of the deep mining support structure, which can provide a theoretical basis and technical support for the selection of support materials.

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Dual-damage constitutive model to define thermal damage in rock

Cited by 55 publications

References 35 publications

Creep damage behaviors of red sandstone subjected to uniaxial compression after high‐temperature heat treatment using acoustic emission technology

Creep damage behaviors of red sandstone subjected to uniaxial compression after high‐temperature heat treatment using acoustic emission technology

Study on mechanical properties and statistical damage constitutive model of red sandstone after heating and water-cooling cycles

Investigating the Effect of Temperature Changes on the Physical Field of Surrounding Rock in a Deep Gold Mine

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