Mechanical properties and energy evolution of coal-rock assemblages with different height ratios under supercritical CO2 action
YU Moran
WANG Kai
ZHANG Xiaoqiang
JIANG Yulong
CAI Tingting
Abstract：For researching the triaxial mechanical properties and energy evolution laws of coal-rock assemblages under the action of supercritical CO2,a supercritical CO2 immersion system was used to perform immersion and triaxial compression experiments on 4 kinds of coal-rock assemblages with different height ratios.The experiments indicate that:(1)With the coal-rock height ratio augments,triaxial compressive strength and elastic modulus of the assemblage reduce,and the strain deformation gradually increase at the time of destruction.(2)After supercritical CO2 immersion,the triaxial compressive strength and elastic modulus of the combined specimens decreased to different degrees;as the rise of the coal-rock height ratio,the reduction degree of the triaxial compressive strength and elastic modulus of the combined specimens increased.(3)After loading the damage of the assemblage,there are no obvious cracks in the rock part,and the damage mainly occurs in the coal body,while the destruction of the coal body after supercritical carbon dioxide immersion is even more fragmented.(4)The total energy,elastic energy and dissipation energy of the assemblage gradually decrease with the raise of coal-rock height ratio;supercritical CO2 immersion reduced the total energy,elastic energy and dissipation energy of the assemblage,but the proportion of the dissipation energy augmented.
Keywords：supercritical CO2coal-rock assemblageheight ratiotriaxial compressive strengthelastic modulusenergy evolution
Publication Date：2025-02-09
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 134-141 )