Study on the residual strength of soil where slip surface exists in cyclic direct shear test

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An attempt to develop a cyclic direct shear test procedure for measuring the residual strength of soils was made. The results of the cyclic direct shear tests were compared with those of ring shear tests for reliability.following are the conclusions :・The residual strength appeared when the amplitude of shear displacement was larger than 0.25 cm in the cyclic direct shear tests.・The residual strength in the cyclic direct shear tests developed at a smaller amplitude of shear displacement than that observed in monotonic direct shear tests.PHIr in the cyclic shear tests was larger than that in the ring sheat tests. This difference is considered to be adjustable by using test results from many kinds of soil.