关键词: 上海软土, 重塑样, 排水剪切试验, 超固结比, 本构模型

Abstract:

A number of consolidated-drained triaxial tests were carried out on the remolded Shanghai clay with different over consolidation ratios (OCRs) under constant confining pressures and constant mean principal stresses. The stress -strain relations at different OCRs, confining pressures and stress paths are obtained. The effects of OCR, confining pressure and stress path on the mechanical behaviors of the remolded Shanghai clay are clarified; and the critical state stress ratio and internal frictional angle are obtained. A constitutive model proposed by Yao et al. for overconsolidated clays used to simulate the mechanical behavior of the remolded Shanghai clay with different OCRs using the model parameters from isotropic compression and triaxial shear tests. The simulated results show that the constitutive model can predict well the strength and deformation of the remolded Shanghai soft clay with different OCRs and stress paths.

Key words: Shanghai soft clay, remolded sample, drained triaxial shear test, overconsolidated ratio, constitutive model