Experimental Study on Mechanical Properties of High Temperature Granite with Different Cooling Methods

Featured Application Studying the mechanical properties of high-temperature rocks after natural cooling can give us a better understanding of the mechanism of high-temperature effects on rocks. However, in some practical projects (such as geothermal energy mining), the high temperature rock body will be rapidly cooled by water, and its properties will change. Therefore, it is necessary to study the mechanical properties of rocks with different cooling methods, so as to provide theoretical reference for practical engineering. Due to various factors, high-temperature rocks are often affected by different cooling methods. They will lead to changes in rock mechanical properties, which firmly connect with the safety and stability of practical projects. At present, there are many studies of the microscopic characteristics of rocks under different cooling methods, but few on the mechanical characteristics of rocks under the same conditions. Therefore, it is necessary to carry out experimental research on the mechanical properties of rock under different cooling methods. The study shows that the deterioration degree of the sample increases gradually with temperature rising and the cooling methods have different effects on the change of the sample in mass, volume and density. The stress-strain curve of the sample is divided into the crack compaction stage, elastic deformation stage, nonlinear deformation stage and failure stage. The peak strength of the naturally cooled sample is higher than that of the water cooled. The peak strength comes with a trend that goes up first, and then down with the temperature increasing. The uniaxial compression failure of the sample under uniaxial action is tensile failure. The failure characteristic of the sample is influenced both by the cooling modes and the temperature.