Cyclic properties of sand-clay mixtures at low confining stresses
Cyclic properties of sand-clay mixtures at low confining stresses
Small strains and shear stresses induced by railroad vibration, dynamic compaction, or earthquakes can cause strength degradation, pore pressure build-up, and accumulation of strains at large number of load cycles. In general, strength degradation and pore water pressure build-up are correlated with the plasticity index and thus the content of fine particles, meaning that a threshold for strength degradation will be lower for sands than for silty and clayey sands. Confining stresses play a significant role in soils shear behaviour. Fully saturated soil at low confining stresses is likely to have a significant strength reduction compared to the soil at higher confining stresses if loaded to the same number of cycles. This is very important for slopes that are prone to shallow sliding. This paper presents the test results of an artificial mixtures of sand and kaoline used for a small-scale physical model of slope subjected to cyclic loading. Mixtures are tested using cyclic triaxial apparatus under undrained condition at low confining stresses. The results show that the sand-clay mixture with 15% of kaoline powder exhibit larger pore water pressure than the mixtures with lower percentage of kaoline.
V. Jagodnik; D. Marusic; J. Peranic; M. Vivoda Prodan; Z. Arbanas; D. Katalinic
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
A - New developments on structural design
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