Deformation control and structure safety of high concrete faced rockfill dams in a narrow valley

Abstract

A 230 m high concrete faced rockfill dam (CFRD) built in narrow valley was taken as an example, the deformation control concept and corresponding engineering measures of the CFRDs built in narrow valleys were systematically introduced. The mechanical parameters of the dam materials were determined via comprehensive dam material transient test, rheological test, and interfacial test. The dam behaviors in construction, water storage, and operation period were simulated. The stress and deformation safety of the key parts such as concrete slab, peripheral joints during long鄄term operation were mainly evaluated. The results show that, after adopting the high concrete plinth, setting high modulus zone, reducing the slab width, as well as proper pre鄄settlement periods, the structure safety of the dam can be guaranteed.