Load-Induced Damage Of The Interface Between Structure And Coarse Grained Soil
粗粒土与结构接触面受载过程中的损伤

The monotonic and cyclic behavior of the interface between structure and coarse grained soil was investigated through test study in both macroscopic and microscopic way. The internal relationship between micro-physical state change and macro-mechanical response is discovered through analyzing the observation results of the interface. The concept of damage is therefore extended to characterize the evolution of the physical states as well as resulting evolution of the behavior of the interface between structure and coarse grained soil, which develops continuously from the initial state to the ultimate state. The evolution of the physical states mainly consists of the crushing and compression of soil particles near the structure. The volumetric strain due to dilatancy of the interface could be divided into reversible and irreversible dilatancy component, in which the irreversible dilatancy component could essentially indicate the evolution of the physical states as well as the behavior of the interface. The irreversible volumetric strain due to dilatancy is then demonstrated as a measurement of the damage extent of the interface, which could be normalized as damage variable. Finally, a new scheme is presented to constitute a damage model of the interface between structure and coarse grained soil.