Abstract
In this paper, it is examined whether the type of direct shear tests can be applied to highly organic soil to evaluate strength characteristics in the laboratory. A series of shear box tests and ring shear tests are performed on a remolded samples. Based on the test results, strength characteristics of peat soil obtained from direct type shear tests are discussed comparing with those on clay soil. Direct type shear test data are also compared with those by consolidated undrained triaxial tests. It is concluded that direct type shear tests provide more reliable strength parameters on highly organic soil than triaxial or unconfined compression tests. Practical usefulness of the direct type shear test, especially shear box test, is also suggested for the determination of the strength parameters of highly organic soils.
