The vibration tests of two type model anchored sheet-pile walls which the dredge level is plane and not plane were perfomed in order to investigatge the degree of fixity below the dredge level during earthquake. In both case, the height of wall above the dredge level is equal and the magnitude of moment about the tie-rod level due to passive earthpressure below the dredge level is nearly equal. Results of the tests are summerized as follows.
1.The acceleration response of model and the load acting on the anchor are nearly equal in both case.
2.The degree of fixity below the dredge level in the case which the dredge level is not plane decrease more than that in the case which the dredge level is plane.
3.The maximum bending moment of sheet-pile wall in the case which the dredge level is not plane is larger than that in the case which the dredge level is plane.