水饱和岩石中爆炸应力波传播的数值模拟

基于连续介质力学和不相融混合物理论，假定组分间无相对运动，采用B-W-N-B有效应力准则，在屈服面中引入孔隙影响因子，提出了一种多孔含水介质流固耦合的本构模型，并给出了孔隙的演化方程，对水饱和凝灰岩介质中的爆炸应力波传播作了数值模拟。数值计算给出的应力波形与实测结果有良好的一致性。采用本文中所述流固耦合本构模型，可很好地预测水饱和岩石中爆炸波的演化规律。

Numerical simulation for blast wave in water-saturated rock

Within the framework of continuum mechanics and immiscible mixture theory, and by assuming that there is no relative motion between the components, an elastic-plastic constitutive model involving damage evolution for fluid-saturated porous solid is proposed. The porosity evolution is established on the conventional equipressure experiments and the effect of porosity on the yield function is considered in the new constitutive relations. By using the B-W-N-B effective stress rule, the blast waves in the fully water-saturated porous tuff are numerically simulated and the results are in good agreement with experiments, demonstrating that the model proposed in this paper is capable of predicting blast waves in water-saturated porous rocks.