关键词: 有机质, 黏土矿物, 软土, 结合水, 流变性质

Abstract:

An improved direct shear creep apparatus was used to test the rheological properties of two soft soil samples respectively containing organic matter and bentonite with the same content in the same test conditions. The results show that （ 1 ） organic matter and bentonite are two important factors affecting the rheological properties of soft soil, especially the former; （2） the effects of organic matter and bentonite on the rheological properties of soft soil are due to the bound water adsorbed by montmorillonite on the soil particle surface; and （3） the firmly-bound water is the primary factor and the loosely-bound water is the secondary factor to induce the rheological properties. The test results help to reveal the emerging causes of soil rheology and to improve the existing calculation theories of rheology deformation of soft soil.

Key words: organic matter, clayey mineral, soft soil, bound water, rheological property