In this paper, two types of direct shear tests; direct shear box test and ring shear test, are performed in constant volume or constant pressure condition on highly organic soil or clayey soil in order to evaluate their strength characteristics. Strength characteristics from these tests are compared with results of other tests such as triaxial compression tests and effects on strength characteristics due to test method or shear condition are discussed. In the results of the series of these tests, it is shown that these kinds of direct shear tests can contribute to obtain proper value of strength characteristics for highly organic soil and are enough effective in not only clayey soil but also highly organic soil.
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