Abstract
Cyclic vertical-torsional coupling tests were performed on saturated Nanjing fine sand with a relative density of 50% using a hollow cylinder apparatus. The effect of complex initial stress conditions on undrained dynamic strength of saturated Nanjing fine sand was investigated. It is shown that the initial confining pressure, p0, the initial stress ratio, R0, and the initial angle of maximum principal stress direction, α0, have great effects on the characteristics of the dynamic strength of Nanjing fine sand. The dynamic strength increases with p0 and R0, while it decreases with α0. The effect of initial intermediate principal stress parameter b0 on the dynamic strength is slight.
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