標準締固め土のせん断特性の異方性と水浸の影響

The standard compacted soils have three layers, so the specimen cut from that are quite within the bounds of possibility of anisotropy. The shearing tests are performed for the specimen cut from the standard compacted soils which axis are inclined with compacted horizontal layer. In these tests, the influence of soaking on the shearing properties of soils are expermented and the effect of soil water suction on the shearing strength is also calculated from the shearing tests on soaked and unsoaked specimen.
From these experinlents, the anisotropy of standard compacted soils are not recognized for their shearing properties. By soaking of specimen the cohesion c' is decreased and angle of internal friction φ' is increased or nearly constant. The decrease of c' is induced by the disappearance of the component of effective sterss X(u_a-u_w) caused by suction of partly saturated soils. The magnitude of X(u_a-u_w) are within the range of 0-2.0kg/<cm>^^^2.