Strength and Stress-Strain Relationship of Rockflll under Plane Strain Condition

The rockfill materials of limestone and fine sandstone were tested by large scale plane strain apparatus in air dry and saturated state respectively.These test results revealed that:(l)the shear strength of rockfill materials under plane strain condition is higher than that in triaxial state, (2)the strength of rockfill material in saturated state is lower than that in air dry state, (3) in comparison with triaxial tests, the strain softening behavior is more obvious in plane strain state, (4)the Poisson’s ratio of rockfill material in plane strain state is almost a constant, and it is less affected by confining pressure σ3.