Analysis of Microscopic Mechanism and Physico-Mechanical Properties of High Temperature-Water Cooled Basalt

In order to study the effect of high temperature-water cooling on the physical and mechanical properties of basalt, physical test, static uniaxial compression test, X-ray diffraction and electron microscope scanning test were carried out on basalt samples after water cooling at room temperature (25 ℃) and high temperature (100 ℃, 300 ℃, 450 ℃and 600 ℃). The micro damage mechanism of samples after high temperature-water cooling and the correlation between physical and mechanical properties of samples and temperature were analyzed. The results show that high temperature-water cooling does not change the main mineral components of basalt, but has an effect on its relative content; The larger the temperature gradient is, the more internal cracks are caused by thermal shock. When the temperature rises to 600 ℃, the dimple fracture appears in the microstructure. When the temperature is increase, the samples show the change from gray green to red, the enhancing of mass loss rate, the weakening of longitudinal wave velocity, the slowing down of stress-strain curve, the deterioration trend of peak strength and elastic modulus, and the deterioration degree gradually intensifies; Under the coupling action of high temperature water cooling and load, the evolution curve of the total damage variable of the specimen gradually slows down with the increase of temperature, indicating that the specimen gradually changes from brittle to plastic.