Dynamic triaxial tests of the liquefaction characteristics of saturated coral sand
For the careful examination of the mechanical behavior of saturated coral sand,a series of undrained cyclic triaxial tests was performed on saturated coral sand(Chibishi).The effects of different relative densities(Dr)and cyclic stress ratios(CSRs)on the excess pore water pressure(Δu),axial strain ea,and dynamic strength of coral sand were explored.Three main types of"Δu",including uniform rising in the early stage,sudden rising in the early stage,and sudden rising in the late stage,can be developed in the presence of various CSRs.In addition,a new pore pressure model was used to characterize the pore pressure ratio ru with uniform growth and sud-den increase in the early stage.Under the same Dr,the number of cycles gradually decreased with the CSR when the axial strain with double amplitude εDA=5％was considered.Under e-quivalent dynamic load,differences in the development of cyclic liquefaction resistance for various coral sands were detected.This study enriches the understanding of the liquefaction characteris-tics of coral sand and provides a reference for the seismic design of nearshore and coastal projects.
国家科技期刊平台
NSTL
万方数据
维普
