抄録
Aiming at estimating K0-value (the coefficient of earth pressure at rest) of a saturated medium dense sand, a series of anisotropic consolidation tests (σ'3/σ'1=constant) and K0-consolidation tests (ε3 =0) were carried out. Toyoura Sand, the relative density of which is about 70%, was used in the experiments. In the anisotropic consolidation tests, it was shown that the principal strain ratio (ε3/ε1) converges to some values in response to the increase of stress level. Then the K0-values were interpolately (or extrapolately) determined as a principal stress ratio corresponding to zero principal strain ratio based on the relationships between the principal stress ratio and the principal strain ratio. The K0-values estimated from the anisotropic consolidation tests and the K0-consolidation tests were O.61 and O.58 respectively and were found to be about 50% higher than the values estimated from Jaky's equation. In the experiments of this investigation, the influences of the volume change due to membrane penetration or compression of filter paper, the end friction, the reference state etc. on the experimental results were carefully investigated. It was made clear that the obtained K0-values were largely affected by the volume change correction.
