Engineering properties of sandstone heated to a range of high temperatures

Pathiranagei, Savani Vidana; Gratchev, Ivan

doi:10.1007/s10064-020-02065-6

Cited by 30 publications

(4 citation statements)

References 44 publications

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“…Because clay plays the role of filling and bonding between particles, the decomposition will lead to the poor bonding between rock particles, which makes it easier to crack. On the other hand, quartz will undergo α–β transition at 573°C, and this phase change will cause the volume of quartz particles to change rapidly and produce cracks 48 . The above reasons will lead to significant thermal cracking of the rock after temperature treatment, and wider thermal cracks will occur on the outer edge of the sample due to greater circumferential thermal stress.…”

Section: Thermal Stress Mechanics Model and Thermal Fracture Mechanis...mentioning

confidence: 99%

Thermal cracking characteristics and mechanism of sandstone after high‐temperature treatment

Xiao

Yu²,

Li³

et al. 2021

Fatigue Fract Eng Mat Struct

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To study the thermal cracking characteristics and mechanism of sandstone after high-temperature treatment, the pore size distribution and micromorphology of sandstone were observed by nuclear magnetic resonance and scanning electron microscopy. Then, based on the Weibull distribution theory, a thermal elastic mechanical model of random heterogeneous rock was established for the rock unit, the thermal stress distribution characteristics of sandstone were analyzed, and the thermal fracture mechanism of rock was discussed. The results show that the porosities of the samples increased with increasing temperature and the proportion of large pores increased significantly when exceeded 400 C. Particularly when reached 1000 C, thermal cracking was distributed in a complex network. Additionally, different rock units are in different thermal stress states, which leads to the regional differences in the distribution of rock thermal fracture. When exceeded 400 C, there were obvious thermal cracks near the outer edge that weakened the mechanical properties of rock.

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Section: Thermal Stress Mechanics Model and Thermal Fracture Mechanis...mentioning

confidence: 99%

Thermal cracking characteristics and mechanism of sandstone after high‐temperature treatment

Xiao

Yu²,

Li³

et al. 2021

Fatigue Fract Eng Mat Struct

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“…With the reduction and depletion of shallow mineral resources in the 21st century (Gautam et al, 2016;Zhang et al, 2015), the development of underground resources and deep space such as geothermal exploration, mining of petroleum and natural gas, and disposal of radioactive nuclear waste becomes the norm (Tharom and Hadi, 2020;Vidana Pathiranagei and Gratchev, 2021;Wong et al, 2020;Xu et al, 2020). However, the subsurface temperature rises by approximately 30$50 C/km (Xie et al, 2015), making temperature a vital factor in controlling the mechanical behavior of deep rock (Justo et al, 2020;Leroy et al, 2021;Vagnon et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Modeling temperature dependence of tensile fracture strength for rocks considering phase transition and the direct effect of thermal damage

Zhao,

Ma,

Zheng

et al. 2023

International Journal of Damage Mechanics

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Accurately and conveniently acquiring the tensile fracture strength of rocks at different temperatures is vital no matter for the security or economical design of deep underground engineering projects. Extensive testing in the laboratory, assisted with fitting approaches, is the main method to obtain the high-temperature tensile fracture strength in the available literature. However, the high-temperature destruction test is difficult to conduct and requires numerous time and resources. In this work, considering the main physical mechanisms such as phase transition and thermal damage that affect the tensile fracture strength of rocks at high temperatures, theoretical models for predicting their temperature-dependent tensile fracture strength (TDTFS) are established based on the Force-Heat Equivalence Energy Density Principle. The presented models achieve great prediction on the different variation trends of tensile strength below and above the phase transition temperature, as well as the corresponding sudden change of strength. For rocks without phase transition, the presented model only needs some physical parameters tested at room temperature can get a good prediction capacity on the TDTFS. Moreover, a new theoretical characterization model of the equivalent thermal damage parameter was presented and take a comparison with the previous model. Finally, the potential applications and limitations of the TDTFS model are further discussed. The application threshold of the presented TDTFS models is relatively low, and they may therefore be suitable as a method for providing a rapid and preliminary evaluation of strength at a large temperature range for rock engineering.

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“…Some researchers previously studied the mechanical properties and internal structure changes of rock under different temperatures [ 2 , 3 , 4 , 5 , 6 , 7 ]. Li Ximon et al [ 8 ] analyzed the fatigue deformation and characteristics of rock under cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Constitutive Model and Fracture Failure of Sandstone Damage under High Temperature–Cyclic Stress

Luo

2022

Materials

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Deformation and damage characteristics of high-temperature rocks during underground coal gasification are the fundamental mechanical problems encountered in coal-bed gasification production. In order to study the characteristics of deformation and damage processes of rocks under the joint action of high temperature and high stress, a damage intrinsic model under the joint action of high temperature–cyclic loading is needed. In this paper, we used the damage mechanics theory to establish the damage instantiation model of rocks under the joint action of high temperature loads based on the Mohr–Coulomb strength criterion. It was found that the higher the temperature, the lower the strength of sandstone, the lower the peak stress, and the higher the peak strain, the peak stress decreased from 95.6 MPa at room temperature to 74.8 MPa at 400 °C to 49.5 MPa at 800 °C, and the peak strain increased from room temperature to 400 °C to 800 °C by 27.9% and 33.4%, respectively. With the increase in temperature, the internal microcracks of sandstone increased and expanded, which caused the degree of damage to intensify, and the macroscopic expression was the reduction in strength and stiffness of the sandstone. The rock went through four stages from loading to damage, including damage weakening, plastic deformation, strain softening, and residual deformation. The four types of fractures that led to the overall rupture of the rock were open fracture, secondary coplanar fracture, secondary inclined fracture, and oblique fracture. The damage intrinsic model constructed in this paper could better reflect the damage process of thermally damaged sandstone under the action of periodic loading, and had certain rationality. The damage intrinsic evolution curve, as well as the damage mechanism of sandstone under the action of macroscopic high temperature-loading, were discussed from the perspective of microscopic damage evolution, and the fracture extension pattern and penetration mechanism of the rock under different temperatures were analyzed. The research results provide an important reference for the design and engineering application of gasifiers in coal-bed underground gasification projects.

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Engineering properties of sandstone heated to a range of high temperatures

Cited by 30 publications

References 44 publications

Thermal cracking characteristics and mechanism of sandstone after high‐temperature treatment

Thermal cracking characteristics and mechanism of sandstone after high‐temperature treatment

Modeling temperature dependence of tensile fracture strength for rocks considering phase transition and the direct effect of thermal damage

Constitutive Model and Fracture Failure of Sandstone Damage under High Temperature–Cyclic Stress

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