Relationship Between Physical and Mechanical Parameters of Coal Measures Rocks and Acoustic Wave Velocity

The longitudinal and transverse wave velocity of sedimentary rock of coal measures is systematically analyzed by ultrasonic‐time dynamic testing. The parameters of dynamic elasticity are calculated. Static mechanical parameters of the rocks are synchronously tested. The qualitative and quantitative relationships between the dynamic and static elasticity parameters, and between the physical and mechanical parameters and acoustic wave velocity of the rocks are established. The research results show that there is a good positive correlativity between dynamic modulus of elasticity and the longitudinal or transverse wave velocity, but there is no such positive correlativity between dynamic Poisson's ratio of the rocks and its longitudinal or transverse wave velocity. The dynamic elastic modulus of the rocks is higher than its static elastic modulus, while the dynamic Poisson's ratio is lower than its static Poisson's ratio, and there is a linear correlativity between them. The relationships between density of the rock, uniaxial compressive strength, tensile strength and the longitudinal or transverse wave velocity are also the positive correlativity, which are best fitted by quadratic function, exponential function and linear function, respectively.