Research on the Change Rules of Longitudinal Wave Velocity and the Rebound Value of Sandstone under Water-Rock Interaction

With the development of the construction of hydropower engineering, the change rule of physical and mechanical properties of rock under water-rock interaction become a hot research topic. However, the change rules of longitudinal wave velocity and rebound value of rock were less involved in the past. Based on that, the test was designed to analyze longitudinal wave velocity rebound value and uniaxial compressive strength of rock sample under different stages of water-rock interaction. Test results showed that degradation trend of longitudinal wave velocity and rebound value of rock sample were obvious and consistent and had good correlation with uniaxial compressive strength under circulating action of immersion-air dry, based on which the comprehensive empirical formula of uniaxial compressive strength, longitudinal wave velocity, and rebound value was established. Test results show the said empirical formula is credible. Therefore, changes of mechanical parameters and properties can be speculated by changes of physical parameters and those are easily and conveniently tested.