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In the present paper the effect of the error in estimating EC/ER when an arch dam is designed, on the stress in and the deflection of the arch dam is analitically studied two dimensionally and three dimensionally. It is explained that the thinner the arch dam is and the larger its center angle is, the less effect of the foundation deformation and it has an excellent characteristic from the stand point of the stress in the dam body, and further it has been made clear that the difference in the condition of boundary deformation does not so much affect the horizontal arch stress, but greatly affects the vertical stress of the arch, and that if the EC/ER becomes larger, the vertical tensile strength at the upstream base which is generally problematical in relation to the allowable tensile stress, becomes smaller. The clever action of the dam stress adjustment derived from the statical indetermin-ability of high degree which is intrinsically held in the arch dam, is quantitatively discussed and a convenient numerical table is presented. The effect of consolidation grout on the dam body stress is also discussed to a certain extent.

EFFECT OF DEFORMATION ON FOUNDATION ON THE STRESS IN ARCH DAM