Experimental study on the failure process of sandstone subjected to cyclic loading and unloading after high temperature treatment

Xiao, Weijing; Yu, Guoqing; Li, Haitao; Zhan, Weiyun; Zhang, Dongming

doi:10.1016/j.enggeo.2021.106305

Cited by 47 publications

(14 citation statements)

References 35 publications

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“…Some scholars have also proposed failure criteria based on energy conversion. For example, Xiao, Yu [ 23 ] proposed a fatigue life prediction model based on generalized strain energy density. Zhu, Huang [ 61 ] characterized rock damage characteristics through the dissipated energy of rock mass in the shear process.…”

Section: Energy Evolution Law Of Normal Unloadingmentioning

confidence: 99%

“…Rong, Li [ 22 ] found that different aspect ratios would affect the failure mechanism of rock mass during unloading, and that an increase in aspect ratio would change the failure mode of rock from splitting failure to tensed shear failure. Xiao, Yu [ 23 ] studied the influence of temperature on the failure process of sandstone, and believed that Young’s modulus in the unloading stage first increased and then decreased with an increase in temperature. Undoubtedly, these studies have made people more deeply understand the deformation, strength characteristics, fracture evolution mechanism and energy evolution law of rock mass under unloading conditions [ 24 , 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Shear Behavior of Rock Composite Material under Normal Unloading Conditions

et al. 2023

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As a composite material, the stability of rock mass is usually controlled by a joint. During the process of excavation, the normal stress of the joint decreases continuously, and then the shear strength of the joint decreases, which may eventually lead to the instability and failure of rock mass. Previous studies have mainly focused on the shear behavior of joints under constant normal stress, but have rarely considered the unloading of normal stress. In this paper, a direct shear test of joints with different roughness was carried out, in which the shear stress remained unchanged while the normal stress decreased. The strength characteristics of joints were explored, and the deformation and acoustic emission-counting characteristics of joints were analyzed by digital image correlation (DIC) techniques and acoustic emission (AE). A new method for predicting the instability of joints under normal unloading was proposed based on the evolution law of normal deformation energy (Un), tangential deformation energy (Us) and total deformation energy (U0). The results show the following: (1) The unloading amount of normal stress was enlarged for greater initial normal stress and roughness, while it decreased with an increase in initial shear stress. (2) AE events reached their maximum when the normal stress was equal to the failure normal stress, and the b-value fluctuated more frequently in stable development periods under normal unloading conditions. (3) U0 would change with the loading and unloading of stress, and this may be used to predict the unloading instability of rock mass using the abrupt change of U0.

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Section: Energy Evolution Law Of Normal Unloadingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on Shear Behavior of Rock Composite Material under Normal Unloading Conditions

et al. 2023

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“…26 Furthermore, the mechanical characteristics of thermaltreated rock under complex stress path, such as cyclic loading, have also been investigated. [27][28][29][30] For example, the energy property of thermal-treated sandstone was investigated by conducting the cyclic loading experiment on thermal-treated sandstone. 27 These studies show that the energy dissipation ratio of sandstone increases as the temperature increases under cyclic loading, which indicates the energy storage property is weak at high temperature.…”

Section: Introductionmentioning

confidence: 99%

“…[27][28][29][30] For example, the energy property of thermal-treated sandstone was investigated by conducting the cyclic loading experiment on thermal-treated sandstone. 27 These studies show that the energy dissipation ratio of sandstone increases as the temperature increases under cyclic loading, which indicates the energy storage property is weak at high temperature. Meanwhile, it is also found that the effects of temperature on Young's modulus become increasingly obvious as the cyclic number increases.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, scholars have also found that high temperature can induce the decreasing brittleness of granite 26 . Furthermore, the mechanical characteristics of thermal‐treated rock under complex stress path, such as cyclic loading, have also been investigated 27–30 . For example, the energy property of thermal‐treated sandstone was investigated by conducting the cyclic loading experiment on thermal‐treated sandstone 27 .…”

Section: Introductionmentioning

confidence: 99%

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Evolution of mechanical properties and microstructure in thermally treated granite subjected to cyclic loading

Fan,

Wang,

Qiu

et al. 2024

Fatigue Fract Eng Mat Struct

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In high‐temperature geological engineering applications, cyclic loads induced by various factors (e.g., earthquakes, excavation, and blasting) can exacerbate the thermal damage of engineered rock formations. Therefore, this study investigates the mechanical properties and microstructure evolution of thermally treated granite subjected to cyclic loading. First, the mechanical property variations of thermally treated granite under cyclic loading were studied through cyclic loading experiments. Subsequently, nuclear magnetic resonance (NMR) was employed to examine the microstructure evolution of thermally treated granite under cyclic loading. Lastly, the effects of cyclic loading on maximum strain, Young's modulus, pore size distribution, and porosity of thermally treated granite were discussed. Results indicate that at the same number of cycles, maximum strain increases with increasing temperature, while Young's modulus decreases. For granite subjected to the same thermal treatment, the maximum strain increases as the cyclic number increases, while Young's modulus decreases. Concurrently, porosity and fractal dimension initially decrease and then increase with a rising number of cycles.

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Effect of Thermal Treatment on the Physical and Mechanical Properties of Sandstone: Insights from Experiments and Simulations

Liu

2022

Rock Mech Rock Eng

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Experimental study on the failure process of sandstone subjected to cyclic loading and unloading after high temperature treatment

Cited by 47 publications

References 35 publications

Experimental Study on Shear Behavior of Rock Composite Material under Normal Unloading Conditions

Experimental Study on Shear Behavior of Rock Composite Material under Normal Unloading Conditions

Evolution of mechanical properties and microstructure in thermally treated granite subjected to cyclic loading

Effect of Thermal Treatment on the Physical and Mechanical Properties of Sandstone: Insights from Experiments and Simulations

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