考虑软硬物质双变形特征的脆性岩石损伤本构模型研究

Damage constitutive model of brittle rocks considering double deformation characteristics of soft and hard materials

基于脆性岩石变形力学特征,将脆性岩石视为由岩石颗粒骨架等硬物质以及裂隙和孔隙等软物质组成;考虑软硬物质变形特点,分别建立了软物质与硬物质的本构关系以及软硬物质与RVE之间的关系。然后,基于几何损伤理论,建立了考虑软硬物质双变形特征的脆性岩石变形破坏模拟方法,根据软硬物质及其与脆性岩石宏观变形关系以及峰值点法,分别提出了力学参数和统计参数的合理确定方法。最后,通过实例分析对本文模型和方法进行验证,结果表明本文模型能够对脆性岩石变形破坏过程进行模拟,脆性岩石宏观变形被视为由软物质变形和硬物质变形两部分组成具有可行性与合理性。

The simulation method of deformation and failure process of brittle rocks is one of the important content of rock deformation mechanics.Firstly,brittle rocks are considered to be composed of hard materials such as rock grain skeleton and soft materials such as crack and pore based on its deformation mechanics characteristics.Considering the deformation characteristics of hard and soft materials,the deformation mechanics relationships between the soft-hard materials and brittle rocks are established,which show that the macro-deformation of the brittle rocks consists of two parts:one from the soft material and the other from the hard material.Then,the statistical damage theory is introduced to establish the damage constitutive model of brittle rocks considering the double deformation characteristics of soft and hard materials,and the methods of determining the model parameters are given.Finally,the experimental data and theoretical curves of the model are analyzed,and the model can be used to simulate the deformation and failure process of brittle rocks,which shows that the model and method in this paper are reasonable and feasible.