Influence of the initial hydrostatic pressure on contact area coefficient under drainage condition

The expression of effective stress proposed by Terzaghi has always been questioned. Many correction formulas are modification pore pressure term. factor is related to porosity, contact area and other factors. When the particles in point contact, that Terzaghi, while for surface particles, actual increases produced passing through based on stress. There many factors affect development pressure, therefore, a series drained triaxial tests were carried out four groups sand samples with different initial hydrostatic pressures study influence due term (σ α ). test results show shear strength under same confining which indirectly indicates