Since the anchored sheet-pile walls are under the influence of the complicated soil condition, it is not easy to analyse the behaviour of such a structure during earthquake.
　The model vibration tests of anchored sheet-pile walls were performed in the dry state by the method using a box on the vibration table, as the first step to in vestigate the earthquake resistance of anchored sheet-pile walls. In experiments, two vibration boxes which were 4m long, 1m wide, 1.5m high and 3m long, 0.5m wide, 1m high were used, and two sorts of vibration with the period of 0.3 sec were given. One vibration was the increasing vibration, whose acceleration was increased to 20 ～350 gal at constant rate of about one gal per one period, and other was solitary vibration which had the property like a shock. The model similarity by the dimensional analysis was considered mainly for the model.
　The following facts were obtained from the results of tests.
(1) The lateral earthpressures during vibration become large in the vicinity of the anchor level and do not increase much in the middle part of the span, owing to the movement of the wall and the condition of the anchorage.
(2) The soil stiffness is apt to decrease during vibration, but it seems that threr is a considerable margin for safety on the degree of fixity of the embedment due to the deformation of the wall.
(3) Owing to the distribution of the lateral earthpressure during vibration, the bending moments of the wall are smaller than the values computed by the so-called seismic coefficient method, but the anchor loads are larger than that values.
(4) The characteristics of forced vibration have influence on the residual part of experimental quantities after vibration considerably, and not on the vibrational part of experimental quantities.
(5) On the scale range of the vibration box used in the tests, remarkable difference to the test results does not appear, but the soil stiffness in the small box is apt to decrease during vibrations.
　The general characteristics of anchored sheet-pile walls in vibration has been disclosed to a certain extent by this test, but many problems remain to be solved.