大理岩RHT模型参数确定研究

RHT模型共计包含34个参数，其中A，n，f_s*，f_t*，Q₀，g_c*，ξ，D₁，ε_pm，A_f，n_f，p_comp和N因试验获取途径复杂较难确定，多数学者在利用RHT模型模拟岩石爆破破碎时，不管岩石种类如何变化都只是简单引用混凝土的相关参数，为了较为准确地获得大理岩的相关参数取值，以静力学试验、声波测试试验和SHPB冲击试验为基础，LS-Dyna数值模拟为手段，通过正交试验的方法对以上参数进行优化确定，并将参数优化前、后的模拟曲线分别与SHPB冲击大理岩的试验曲线进行对比.结果表明:以上参数经过正交模拟试验优化确定后，缩小了模拟曲线与SHPB冲击试验曲线的对比误差，得到了适用于大理岩的RHT模型参数. 

Study on Parameters Determination of Marble RHT Model

RHT model includes 34 parameters.The values of A,n,f*s,f*t,Q0,g*c,ξ,D1,εmp,Af,nf,pcomp and N 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.