Experimental study on the relationship between dynamic and static mechanical parameters of coal

Experimental study on relationships between dynamic and static mechanical parameters of coals is highly significant for study on displacement and deformation characteristics of coal and design of support project. Coal samples taken from the 3th seam in Xinhe mine are shaped into standardized cylinder samples (Φ50 mm×100 mm). P-wave and s-wave velocities were measured using transducer with a frequency of 500 kHz. The uniaxial compression tests were carried out on the MTS815.03 Electro-hydraulic servo-controlled testing machine to obtain the static elastic modulus and Poisson's ratio. Experimental results showed that the correlativity between dynamic elastic modulus and s-wave velocity of coal is better than that with p-wave velocity. The ratio of Ed/Es is mainly distributed between 1.4 and 1.7 in the tested samples. There is a good linear relationship between dynamic/static elastic modulus and dynamic/static Poisson's ratio in tested samples.