Cohesive soil behavior under cyclic loading in undrained conditions
Cohesive soil behavior under cyclic loading in undrained conditions
This paper investigates the cyclic plastic creep phenomenon in cohesive soils during cyclic loading. Plastic creep, defined as the accumulation of excessive plastic strains under a medium stress state in constant stress or strain amplitude tests, is part of the shakedown theory for cohesive soils. Cyclic triaxial tests were conducted to understand the mechanisms, proposing a cyclic plastic creep mechanism. The soil response was analyzed based on pore pressure, stress paths, and plastic strain change, revealing that cyclic plastic creep takes the form of abation for cohesive soils in undrained conditions. In this phase, unlike in shakedown, where the accumulation of plastic strain to a steady-state value is observed, the sample experiences a decreasing plastic strain accumulation rate due to cyclic loading. Therefore, instead of the shakedown criterion, the abation slope is proposed as a form of soil behavior evaluation in long-term cyclic loading. These findings have implications for improving the design and performance of structures on cohesive soils, like foundations or embankments.
Andrzej Gluchowski; Wojciech Sas
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
A - New developments on structural design
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