Experimental investigations of the creep–damage–rupture behaviour of rock salt

Wang, Guijun; Zhang, Lei; Zhang, Yuwen; Ding, Guoyu

doi:10.1016/j.ijrmms.2013.12.013

Cited by 68 publications

(30 citation statements)

References 6 publications

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“…where τ 1 and τ 2 characterize the adjacent two-stage shear stress and c t τ 1 and c t τ 2 indicate the shear displacement at different moments under the respective shear stress conditions. Figure 6 indicates that for the rocks with plastic-elastic deformation characteristics, under the condition of low shear stress, the deformation modulus of rocks in creep behavior increased with time, which is contrary to the deterioration of the mechanical properties of most rocks with time [50,51]. is result is due to the existence of many microcracks in plastic-elastic rocks [52,53].…”

Section: Mechanical Properties With Timementioning

confidence: 93%

Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock-Like Materials

Lin

Zhang

Wang

et al. 2020

Advances in Civil Engineering

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Creep property is an important mechanical property of rocks. Given the complexity of rock masses, mechanical parameters change with time in the creep process. In this work, a nonlinear function for describing the time-dependent change of parameters was introduced and an improved variable-parameter nonlinear Nishihara shear creep model of rocks was established. By creating rock-like materials, the mechanical properties of rocks under the shear creep test condition were studied, and the deformation characteristics and long-term shear strength of rocks during creep were analyzed. The material parameters of the model were identified using the creep test results. Comparison of the model’s calculated values and experimental data indicated that the model can describe the creep characteristics of rocks well, thus proving the correctness and rationality of the improved model. During shear creep, the mechanical properties of rocks have an aging effect and show hardening characteristics under low shear stress. Furthermore, according to the fact that Gk of the nonlinear model can characterize the creep deformation resistance, a method to determine the long-term shear strength is proposed.

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Section: Mechanical Properties With Timementioning

confidence: 93%

Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock-Like Materials

Lin

Zhang

Wang

et al. 2020

Advances in Civil Engineering

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“…The creep properties of rock mass are influenced by the micro-, meso-, and macro-structural planes within the rock. Damage mechanics theory is used to establish the creep damage model, which can deeply identify the deformation and failure mechanism [10][11][12]. Based on the Burgers model, the PLEC was applied to establish the visco-elasto-plastic constitutive model with creep damage evolution.…”

Section: Nonlinear Creep Damage Constitutive Modelmentioning

confidence: 99%

A Novel Method for Stress Calculation Considering the Creep Behaviour of Shale Gas Reservoir

Yu¹,

Li²,

Wu³

et al. 2016

JESTR

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To study the creep effect on the stress field under gas-solid thermal coupling, a novel method for stress calculation considering the creep behaviour of shale gas reservoir was proposed based on the principle of least energy consumption. Then, laboratory tests and mathematical fitting methods were adopted to analyze the creep constitutive model for shale, existence states of shale gas, stress, and temperature. In addition, the nonlinear relationship among permeability coefficient, porosity, and volumetric strain was theoretically derived. Results indicated that the established creep damage model can describe not only the decay and steady creep stages, but also the accelerating creep stage. The temperature effect on the mechanical properties of the rock mass conformed to polynomial characteristics. The elastic modulus slowly decreased and the viscosity coefficient rapidly decreased with increasing temperature. The temperature effect on shale gas adsorption conformed to linear characteristics. The Langmuir volume and Langmuir pressure were inversely proportional to temperature; the deceleration of the former was faster than that of the latter. The proposed method can be used to evaluate the stress field of shale gas wells. This research provides a novel approach for refracturing and analysis of gas flow in shale gas wells.

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“…e creep properties of rocks are distinctly different based on lithological and environmental differences, and they are closely related to the safety and long-term stability of rock mass engineering. Many studies have been conducted based on rock creep [10][11][12][13][14][15][16][17][18][19][20]. However, the effects of temperature on the creep properties of rocks have only been studied for high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Creep Behavior of Red Sandstone under Low Temperatures

Song

Zhang

Yang

et al. 2019

Advances in Civil Engineering

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In cold regions, the deformation characteristics and long-term mechanical properties of rocks under low-temperature conditions are considerably different from those in other regions. To study the deformation characteristics and long-term mechanical properties of rocks in a low-temperature environment and the effect of different temperatures, we perform a multilevel loadingunloading uniaxial creep test on red sandstone samples and obtain the creep curves at different temperatures (20°C, − 10°C, and − 20°C). e results demonstrate that the total strain at each temperature can be divided into instantaneous and creep strains; the instantaneous strain includes instantaneous elastic and plastic strains, and the creep strain includes viscoelastic and viscoplastic strains. Temperature has a significant effect on the deformation properties of red sandstone. A decrease in temperature reduces the instantaneous and creep deformations of the rocks at all levels of stress. In addition, a decrease in temperature exponentially attenuates the total creep and viscoplastic strains of the rocks. 0°C is a critical point for the reduction of the total creep and viscoplastic strains of the rocks. When the temperature is greater than 0°C, the total creep and viscoplastic strains of the rocks decrease rapidly and linearly with decrease in temperature; however, when the temperature is less than 0°C, the decrease in the total creep and viscoplastic strains of the rocks is slow. e steady-state creep rate of the rock samples decreases with decrease in temperature, whereas the creep duration increases with decrease in temperature, especially in the case of the accelerated creep stage. e accelerated creep durations of the rock samples S4 (20°C) and S7 (-10°C) are 0.07 h and 0.23 h, respectively.

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Experimental investigations of the creep–damage–rupture behaviour of rock salt

Cited by 68 publications

References 6 publications

Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock-Like Materials

Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock-Like Materials

A Novel Method for Stress Calculation Considering the Creep Behaviour of Shale Gas Reservoir

Experimental Study on the Creep Behavior of Red Sandstone under Low Temperatures

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