Thermal Damage on Claystone After Exposure to Different High Temperatures: A Review

Zhang, W.; Sun, Qiang; Cao, Liwen; Wang, B.

doi:10.1520/gtj20160106

Cited by 2 publications

(2 citation statements)

References 27 publications

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“…Many researchers found that rock elastic modulus is the function of temperature [35], so it may be de ned as D T to describe the temperature e ect on rock mechanical performances. Assuming D T is zero at 25°C and then at the temperature of T, D T can be de ned as follows:…”

Section: Ermal Damage (D T ) Caused By Temperaturementioning

confidence: 99%

Acoustic Emission and Damage Characteristics of Granite Subjected to High Temperature

Zhang

2018

Advances in Materials Science and Engineering

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Acoustic emission (AE) signals can be detected from rocks under the effect of temperature and loading, which can be used to reflect rock damage evolution process and predict rock fracture. In this paper, uniaxial compression tests of granite at high temperatures from 25°C to 1000°C were carried out, and AE signals were monitored simultaneously. e results indicated that AE ring count rate shows the law of "interval burst" and "relatively calm," which can be explained from the energy point of view. From 25°C to 1000°C, the rock failure mode changes from single splitting failure to multisplitting failure, and then to incomplete shear failure, ideal shear failure, and double shear failure, until complete integral failure. ermal damage (D T ) defined by the elastic modulus shows logistic increase with the rise of temperature. Mechanical damage (D M ) derived by the AE ring count rate can be divided into initial stage, stable stage, accelerated stage, and destructive stage. Total damage (D) increases with the rise of strain, which is corresponding to the stress-strain curve at various temperatures. Using AE data, we can further analyze the mechanism of deformation and fracture of rock, which helps to gather useful data for predicting rock stability at high temperatures.

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Section: Ermal Damage (D T ) Caused By Temperaturementioning

confidence: 99%

Acoustic Emission and Damage Characteristics of Granite Subjected to High Temperature

Zhang

2018

Advances in Materials Science and Engineering

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“…This is different from traditional theoretical analysis and hypothesis. Some investigations (Xu et al 2017;Zhang et al 2017) showed that rock failure could be caused by natural damage and original microcracks. The natural damage indeed has a certain influence on the crack evolution.…”

Section: Spatial Distribution Characteristics Of Cracks In 3d Modelmentioning

confidence: 99%

Three-dimensional Reconstruction and Growth Factor Model for Rock Cracks under Uniaxial Cyclic Loading/Unloading by X-ray CT

Wang

Gao

Shi

et al. 2018

Geotechnical Testing Journal

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The spatial distribution and propagation of cracks are one of the key factors that can influence the initiation of rock failure. In this investigation, the technique of X-ray computed tomography (CT) scanning was used to survey the pattern of rock cracks during cyclic loading/unloading. The distribution and nonlinear development of rock cracks were explored by three-dimensional (3D) reconstruction for use to quantitatively describe their growth. An entropy model for rock mass and a crack growth factor model were established, which could help to reveal the relation between the crack propagation and the macroscopic destruction.The results showed that all disconnected cracks in two-dimensional (2D) images became connected with each other in 3D images. The fractal dimension of rock cracks was increasing first and then decreasing, which was the result of gradual transformation of rock cracks. The growth rate of cracks was decreased with the increase of the quantity of cracks, which was caused by the retardation. When the quantity of cracks grew to a maximal, the growth rate was reduced to zero.

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Thermal Damage on Claystone After Exposure to Different High Temperatures: A Review

Cited by 2 publications

References 27 publications

Acoustic Emission and Damage Characteristics of Granite Subjected to High Temperature

Acoustic Emission and Damage Characteristics of Granite Subjected to High Temperature

Three-dimensional Reconstruction and Growth Factor Model for Rock Cracks under Uniaxial Cyclic Loading/Unloading by X-ray CT

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