考虑土石料颗粒破碎和密度变化的次塑性本构模型建模方法

试验和现场观测都发现高土石坝的坝料在高压及湿化作用下会发生显著的颗粒破碎，颗粒破碎会改变土石料的级配曲线和密度，因而影响其后继力学行为，因此，土石料的颗粒破碎是当前岩土工程领域的研究热点。为了模拟土石料在高压及湿化作用下发生显著的颗粒破碎现象，以及循环加载中的颗粒破碎与应力诱导各向异性随动硬化共同影响下土石料的变形，本文提出了一个建模方法，考虑土石料颗粒破碎和密度变化的影响。所建议的次塑性本构模型在经过试验资料的验证后可用于动力有限元数值计算。

Development of a hypo-plastic model for earth-rock dams considering rock crushing and density changing

It is found from laboratory tests and in-situ observation that earth fills in high dams are usually crushed under high pressure and soaked condition. Particle crushing will change the distribution of earth fills and density; accordingly change the stress-strain behavior. In order to model this behavior, a method is proposed to develop a hypo-plastic constitutive model. Rock particle crushing and density changing, as well as the stress induced anisotropy change in high dams are considered. The hypo-plastic model can also be used to describe cyclic behavior in combination of crushing and density changing effect. The developed model needs test data verification; and then it can be further used into dynamic elastoplastic FEM programming and analysis of high earth-rock dams.