考虑颗粒破碎影响的珊瑚砂临界状态与本构模型研究

临界状态是土力学中一个非常重要的概念,是许多土体本构模型建立的基础。对于珊瑚砂,由于显著的颗粒破碎,其变形特性和临界状态值得深入探讨。通过不同密度和不同围压组合的一系列三轴试验,研究了颗粒破碎对土体变形特性和临界状态的影响,建立了考虑颗粒破碎影响的珊瑚砂临界状态数学表达式,并将其引入砂土状态相关剪胀方程,提出了考虑颗粒破碎影响的珊瑚砂状态相关剪胀方程和本构模型。该模型仅采用一套模型参数就能较好地反映珊瑚砂在不同密度、不同围压条件下的应力变形特性,并且可以考虑珊瑚砂的颗粒破碎特性。

Critical state and constitutive model for coral sand considering particle breakage

The critical state is a very important concept in soil mechanics, and it is the foundation of many constitutive models for soils. As for the coral sand, due to significant particle breakage, its deformation characteristics and critical state are worthy of further study. To study the effect of particle breakage on the deformation characteristics and critical state of soils, a series of triaxial tests with different densities and confining pressures are carried out. A mathematical expression for the critical state of the coral sand considering particle breakage is proposed, and introduced into the state-dependent dilatancy equation for the coral sand. The state-dependent dilatancy equation and constitutive model of the coral sand considering particle breakage are proposed. The stress and deformation characteristics of the coral sand with different densities and confining pressures can be well reflected by using only one set of model parameters, and the particle breakage characteristics of the coral sand can be considered.