【摘要】 数值模拟是当今研究钻地武器对地下岩石和结构毁伤的主要方法，而岩石和混凝土的动态本构模型是地下爆炸模拟准确可靠的关键。基于3强度面的RHT模型，从残余应力面、拉压子午比、应变率增强因子及拉伸损伤演化模型4个方面进行改进，梳理了RHT模型的应力更新和本构计算流程，提出了在开源仿真软件OpenRadioss中的实现与应用方法，并开展了混凝土单元拉压测试和地下自由场爆炸模拟分析，分析结果表明：改进RHT模型解决了传统RHT模型双轴压缩没有应力下降段及三轴拉伸不能损伤累积的错误，优化了单轴、双轴拉伸的损伤演化规律；对于地下自由场爆炸，改进RHT模型计算的应力时程曲线在峰值之后的平稳度更好，数值振荡较低，11个测点应力峰值与试验相比平均误差由传统RHT模型的32.58%降低至12.59%。更多还原

【Abstract】 Numerical simulation is a key method for studying the damage of underground rocks and structures caused by earth-penetrating weapons, with dynamic constitutive models of rock and concrete being critical for accurate underground explosion simulations. This study improves the RHT model by addressing its residual strength surface, tension-to-compression meridian ratio, strain rate enhancement factor, and tensile damage evolution. The stress update process and constitutive computation framework of the RHT model are reviewed, and its implementation in the open-source software OpenRadioss is proposed. Concrete uniaxial and biaxial tests, as well as underground free-field explosion simulations, are conducted to verify the improvements. Results show that the modified RHT model resolves issues in the original model, such as the absence of stress softening in biaxial compression and the lack of damage accumulation in triaxial tension, while optimizing the damage evolution in uniaxial and biaxial tension. For underground explosions, the modified RHT model demonstrates improved stability in stress histories, reduced numerical oscillations, and a reduction in the average peak stress error from 32.58% to 12.59% compared to experimental results.更多还原