フィルダムの耐震設計法に関する基礎的研究

Abstract

Some discussions were made in this paper on the seismic design method of fill dams, through laboratory element tests on dynamic properties of fill materials, shaking table tests on model earth and rock fills, and FEM dynamic response analysis of embankments. The paper consists of discussions on 1) seismic failure patterns of fill dams observed in model tests and in the field, 2) applicability of the seismic coefficient method to rockfill slopes and the static and dynamic properties of the stable angle of friction of rock materials, 3) evaluation of seismic stability of earth and rock fills in terms of cyclic shear strains mobilized in the embankment during earthquake, by introducing the reduction of rigidity with increasing shear strain, and 4) the effects of differential settlement and arching action in the core zone on the re-distribution behavior of stresses during reservior filling, and evaluation of the stability against hydraulic fracturing.