Study on Parameters Determination of Marble RHT Model

RHT model includes 34 parameters. The values of <i<A,n,f</i<<sub<s</sub<<sup<*</sup<,<i<f</i<<sub<t</sub<<sup<*</sup<,<i<Q</i<<sub<0</sub<,<i<g</i<<sub<c</sub<<sup<*</sup<,<i<ξ</i<,<i<D</i<<sub<1</sub<,<i<ε</i<<sub<p</sub<<sup<m</sup<,<i<A</i<<sub<f</sub<,<i<n</i<<sub<f</sub<,<i<p</i<<sub<comp</sub< and <i<N</i< are hard to be determined due to the complicated experimental methods.In previous researches on simulation of rock blasting based on RHT model, many scholars quoted directly from the relevant parameters of concrete or they simply modified values of concrete parameters with little consideration of the kinds of rock material.To get the fairly accurate relevant parameter values of marble, the orthogonal experiment method and LS-Dyna numerical computation were used in this paper to determine and optimize the above parameters on the basis of static tests, wave velocity tests and SHPB impacting experiments. This paper also made a comparison between the simulation curves before and after the optimizing and the stress-strain curves of marble specimen processed by the SHPB impacting experiment.The final results show that the errors between the simulate curve and SHPB impacting experiment curve were decreased dramatically after the parameters had been processed by the orthogonal experiment.The appropriate parameters of the marble RHT model were obtained.