基于DP系列准则的岩石压剪损伤建模和仿真

Modeling and Simulation of Compression-shear Damage of Rock Based on DP Yield Criteria

为预测岩石压剪损伤特征,引入工程评估岩石压剪特性常用的DP屈服准则。将基于DP屈服准则的岩石压剪损伤本构模型嵌入有限元软件LS-DYNA中,模拟计算无限岩体中炸药爆破引起的岩石压剪损伤,并对比分析基于不同DP屈服准则的岩石压剪损伤特征。仿真结果表明,基于不同DP系列准则模拟爆破作用下岩石压剪损伤范围,DP_(1)屈服准则会高估岩石屈服强度,得到的压剪损伤范围明显偏小,不利于施工安全性评估。

In order to predict the compression-shear damage characteristics of rock,the DP yield criterion is commonly used to evaluate rock compressive-shear properties in engineering,and the rock compression-shear damage constitutive model based on the DP yield criterion is embedded in the finite element software LS-DYNA,which is used to simulate and calculate infinite rock masses.Rock damage caused by explosive explosion and the compressive shear damage characteristics of rock are compared and analyzed based on different DP yield criteria.The simulation results show that the DP_(1) yield criterion overestimates the yield strength of the rock,and the obtained compressive shear damage range is obviously small,which is not conducive to the construction safety assessment.