STABILITY ANALYSIS OF EARTH CORE ROCKFILL DAM

Abstract

Faced or i pervious inerm,brarlc type with an impervious membrane of concrete or asphaltic- concrete for water-tightness, usually placed on the upstream slope. With an upstream membrane, the slopes can be _ :ept . steep depending can the angle of friction of rockfill if there is no danger of failure through the. foundations. Thus with hard rock foundations, Fi 'membrane design permits full use of shear strength of rockfill material; an earth core would require some flattening of the dam slopes. The membrane type dams are generally limited to a height of 'about 100 rn- as the design of concrete facing for larger height presents problem of cracking resulting from high tensile strain and differential settlements. The highest membrane type dam is New Exchequer Dart, in U.S.A. , which is 149 m high and is supported on a concrete dam section on the upstream such that the maximum head on the membrane is 92.5 m. Another recently constructed dam with concrete facing is 110 m high Centhana Darn in Australia..........