关键词: 武汉软土, 固结不排水三轴试验, 应力-应变关系, 归一化性状, 归一化因子

Abstract: Based on the consolidated undrained triaxial shear test of Wuhan soft clay, the behaviors of stress-strain relationship are analyzed. The soft clay appears to be strain stabilization or hardening under low confining pressure, but exhibits strain softening phenomenon under higher one. The stress-strain curves of Wuhan soft clay under various confining pressure conditions are all typical hyperbola pattern. The normalization of its stress-strain relationship is important for the study of stress-strain relationship of soft clay. In this paper, a new normalized condition is derived theoretically based on hyperbola function. In this condition, the concept of standard normalized factor, which is defined as the ultimate value of principal stress difference, is introduced. Compared with the confining pressure which is often adopted as the normalized factor, the standard normalized factor is much better at normalizing the stress-strain relationship of soft clay. Meanwhile, the normalized stress-strain relationship of Wuhan soft clay under consolidated undrained condition is established.

Key words: Wuhan soft clay, consolidated undrained triaxial test, stress-strain relationship, normalized behavior, normalized factor