Relationship between Specific surface and Mechanical Properties (2) Relationship between the strength constant of soils and specific surface-On the specific surface of fine

grained soils relating to engineering properties (VI)

Abstract

In this study, consideration has been given to the strength constants of soils using two parameters, specific surface and thickness of the water film. The advantages of these parameters in considering the mechanical properties of soils has been reported, previously. The experiments in this study consisted of triaxial compression tests and vibration tests (resonant method). Five kinds of sample soils were used Deitan soil, Nozyo soil, Marine clay, Ryo soil and Simadai soil.
The study led to the following results:
1. The coefficient of internal friction (tan φ) decreases with increasing thickness of the water film.
2. In general, d (tan φ)/d (thickness of water film) increases with increasing specific surface.
3. The coefficient of internal friction is not influenced by the void ratio.
4. Cohesion is greatest for water film thicknesses of 30Å to 40Å.
5. The complex modulus decreases with increasing void ratio.
6. The dynamic elastic modulus is greatest for water film thicknesses of 30Å to 50Å.