Abstract:
In order to analyze the physical and mechanical properties of water-cooled high temperature rock under cyclic loading, uniaxial compression and cyclic loading tests were carried out on granite, marble and sandstone specimens respectively. The results show that when the heating temperature exceeds 400 °C, the volume growth rate of the three types of rocks increases significantly, thus 400 °C can be taken as the threshold temperature for the sudden change of physical parameters of the three types of rocks. In general, the uniaxial compressive strength of three types of water-cooled high temperature rocks decreases with the increase of temperature, however the peak strength of the 200 °C granite is higher than that at room temperature. Under cyclic load, the hysteretic curve of granite is approximately linear with a larger high limit stress and lesser irreversible deformation; while for green sandstone and marble samples, the high limit stress is lower than that of the granite sample with a larger deformation. With the increase of the cyclic number, the plastic deformation of the three types of rock decrease, the elastic modulus increase, and the strength of the rocks increases then that under uniaxial compression; with temperature increases, the cracks on the failure surface are more developed, and the broken rock are more finely broken.