Assessment of Mechanical Properties for High-Temperature Sandstone in Coal Fire Area Based on Different Cooling Methods

Experimental study on mechanical properties and microscopic mechanisms of layered sandstone after high temperature water cooling

“…Over time, the fissures slowly intersect and infiltrate, creating a network of tiny cracks that negatively impact the mechanical characteristics. The values of the uniaxial compressive strength, elastic modulus, and tensile strength are all less than those of the specimen following natural cooling (Wu et al, 2021;Yang et al, 2021;Zhu et al, 2021;Chen et al, 2022). In addition, when water cools rapidly, it also heightens the thermal resistance between mineral particles, diminishes thermal conductivity, intensifies the concentration of stress in specific areas, and augments the disparity in local bearing capacity.…”