Evaluation of Thermophysical and Mechanical Properties of Sandstone Due to High-Temperature

In this study, thermophysical and mechanical tests were conducted on sandstone samples from room temperature to 1000 °C. Based on the test results, the thermophysical properties (such as specific heat capacity, thermal conductivity, and thermal expansion coefficient) of sandstone after high-temperature treatment and the variations of mechanical properties (including peak strength, peak strain, elastic modulus, and whole stress-strain curve) with temperature were analyzed. Indeed, the deterioration law of sandstone after high-temperature treatment was also explored with the aid of a scanning electron microscope (SEM). The results show that with the increase in temperature, the specific heat capacity and thermal expansion coefficient of sandstone samples after high-temperature treatment increase first and then decrease, while the thermal conductivity gradually decreases. The range from room temperature to 1000 °C witnesses the following changes: As temperature rises, the peak strength of sandstone rises initially and falls subsequently; the elastic modulus drops; the peak strain increases at an accelerated rate. Temperature change has a significant effect on the deterioration rules of sandstone, and the increase in temperature contributes to the transition in the failure mode of sandstone from brittle failure to ductile failure. The experimental study on the thermophysical and mechanical properties of sandstone under the action of high temperature and overburden pressure has a guiding significance for the site selection and safety evaluation of UCG projects.

[1]  Han Li,et al.  Evaluation of the effects of three different cooling methods on the dynamic mechanical properties of thermal-treated sandstone , 2022, Bulletin of Engineering Geology and the Environment.

[2]  S. Yuan,et al.  Fracture properties and dynamic failure of three-point bending of yellow sandstone after subjected to high-temperature conditions , 2022, Engineering Fracture Mechanics.

[3]  T. Fernandez-Steeger,et al.  Evolutionary Analysis of Heterogeneous Granite Microcracks Based on Digital Image Processing in Grain-Block Model , 2022, Materials.

[4]  Fandong Meng,et al.  Study on the Effect of Sandstone Microscopic Damage and Dynamic Compressive Properties After Heat Treatment , 2022, Rock Mechanics and Rock Engineering.

[5]  Yi Du,et al.  Effect of high temperature on pore characteristics, yield stress, and deformation property of sandstone , 2021, Bulletin of Engineering Geology and the Environment.

[6]  Xi Du,et al.  The Mechanism of Fracture and Damage Evolution of Granite in Thermal Environment , 2021, Materials.

[7]  Xiaoping Zhou,et al.  Creep damage behaviors of red sandstone subjected to uniaxial compression after high‐temperature heat treatment using acoustic emission technology , 2021, Fatigue & Fracture of Engineering Materials & Structures.

[8]  Shu-jian Li,et al.  Thermal cracking characteristics and mechanism of sandstone after high‐temperature treatment , 2021, Fatigue & Fracture of Engineering Materials & Structures.

[9]  Liang Wang,et al.  Experimental Study on Relative Permeability Characteristics for CO2 in Sandstone under High Temperature and Overburden Pressure , 2021, Minerals.

[10]  Qiang Sun,et al.  Influence of high-temperature thermal cycles on the pore structure of red sandstone , 2021, Bulletin of Engineering Geology and the Environment.

[11]  M. Dongdong,et al.  Investigation on Damage Characteristic and Constitutive Model of Deep Sandstone under Coupled High Temperature and Impact Loads , 2021, Geofluids.

[12]  A. Jiang,et al.  Experimental investigation on the evolution of damage and seepage characteristics for red sandstone under thermal–mechanical coupling conditions , 2021, Environmental Earth Sciences.

[13]  Y. Zarichnyak,et al.  Studies of the Effective Thermal Conductivity of Sandstone Under High Pressure and Temperature , 2021, Rock Mechanics and Rock Engineering.

[14]  Deming Wang,et al.  Experimental study on changes of pore structure and mechanical properties of sandstone after high-temperature treatment using nuclear magnetic resonance , 2020 .

[15]  Yan‐Hua Huang,et al.  Experimental study on fracture behaviour of three‐flawed sandstone specimens after high‐temperature treatments , 2020 .

[16]  Qiang Sun,et al.  Experiment study of physical and mechanical properties of sandstone after variable thermal cycles , 2020, Bulletin of Engineering Geology and the Environment.

[17]  Peng Luo,et al.  The evolution of sandstone microstructure and mechanical properties with thermal damage , 2019, Energy Science & Engineering.

[18]  Yaoqing Hu,et al.  Influence of Temperature on the Structure of Pore–Fracture of Sandstone , 2019, Rock Mechanics and Rock Engineering.

[19]  S. Zare,et al.  Effect of Water Content Variations on Critical and Failure Strains of Rock , 2018 .

[20]  Yong Kang,et al.  The Influence of Temperature on Mode I Fracture Toughness and Fracture Characteristics of Sandstone , 2017, Rock Mechanics and Rock Engineering.

[21]  Weiqiang Zhang,et al.  The effect of high temperature on tensile strength of sandstone , 2017 .

[22]  Biao Kong,et al.  Electromagnetic radiation characteristics and mechanical properties of deformed and fractured sandstone after high temperature treatment , 2016 .

[23]  Enyuan Wang,et al.  Fracture Mechanical Behavior of Sandstone Subjected to High-Temperature Treatment and Its Acoustic Emission Characteristics Under Uniaxial Compression Conditions , 2016, Rock Mechanics and Rock Engineering.

[24]  Weiqiang Zhang,et al.  Thermal properties of sandstone after treatment at high temperature , 2016 .

[25]  Aihong Lu,et al.  Effects of Thermal Treatment on the Dynamic Mechanical Properties of Coal Measures Sandstone , 2016, Rock Mechanics and Rock Engineering.

[26]  Shi Liu,et al.  An experimental study on the physico-mechanical properties of two post-high-temperature rocks , 2015 .

[27]  Nengxiong Xu,et al.  Physical Properties of Sandstones After High Temperature Treatment , 2012, Rock Mechanics and Rock Engineering.

[28]  Xibing Li,et al.  Mechanical Behaviors and Damage Constitutive Model of Thermally Treated Sandstone Under Impact Loading , 2018, IEEE Access.

[29]  T. Singh,et al.  Effect of Varied Durations of Thermal Treatment on the Tensile Strength of Red Sandstone , 2016, Rock Mechanics and Rock Engineering.

[30]  Thomas Kempka,et al.  Mechanical Properties of Sandstones Exposed to High Temperature , 2015, Rock Mechanics and Rock Engineering.