岩石RHT模型主要参数敏感性及确定方法研究

在34个RHT模型参数中，19个参数可以通过试验、理论研究等手段获得，但还剩15个参数较难确定.为了较为准确的获得相关参数，在只改变参数N、p_comp、f_t*、f_s*、A、n、Q₀、g_c*、ξ、D₁、ε_pm、A_f、n_f、B、g_t*的情况下，利用LS-DYNA对石灰岩进行单轴、三轴压缩模拟计算，通过对比RHT模型的弹性、线性强化以及损伤软化段的曲线对以上15个参数的敏感性进行研究，并以红砂岩为例，利用SHPB冲击红砂岩获得应力-应变曲线，并通过静力学、声波测试等试验获得红砂岩相关物理参数，以LS-DYNA模拟SHPB冲击试验作为手段，通过正交试验的方法得到了红砂岩的RHT模型参数，为了验证所确定参数的正确性，将LS-DYNA模拟SHPB冲击红砂岩的曲线与SHPB冲击试验曲线进行了对比，取得了令人满意的效果. 

Sensitivity Analysis Determination and Optimization of Rock RHT Parameters

Among the total 34 parameters of RHT constitutive model, there are 19 parameters can be confirmed from experiment or theoretical study, but the left ones, N、p_comp、f_t*、f_s*、A、n、Q₀、g_c*、ξ、D₁、ε_pm、A_f、n_f、B and g_t*, are generally hard to acquire. A sensitivity study of the 15 hard-acquired parameters was conducted through numerical simulation of uniaxial and triaxial compression of limestone using LS-DYNA. And then a new method was proposed in this paper to acquire all 34 parameters of RHT model in terms of red sandstone by orthogonal experiment coupled with static test, sonic wave test, SHPB impact test and LS-DYNA numerical simulation. The simulated result of red sandstone is in a well line with the result from SHPB impact test of red sandstone, which evidenced the RHT model of red sandstone is effective.