Computational Identification Of
Real Displacements Of An Arch Dam Using
Nonlinear Material With Geochemical Damping
Author(s)
S. Hernández & L. A. Romera
Abstract
The Belesar dam is an impressive arch dam existing in Spain which has
experienced an unusual displacements field due to geochemical reactions
between alkaline components of the cement and concrete aggregates. A
preliminary study was carried out over past decade intended to computationally
model dam structural behaviour. Recently, a new study containing improvements
with regards to the previous one has been completed. The research worked out
defines a sophisticated constitutive law for the concrete including orthotropic
geochemical damping. The numerical results show a good adequacy with respect
to the measured displacements of the dam.
1 Introduction
The Belesar Dam is an arch dam located in North West Spain. It has a height of
130 m and its maximum length at the top is about 275 m.
The dam has been monitored since construction works finished in 1963. The
structure behaved as predicted at the beginning of the service life but soon
afterwards the dam showed unexpected upstream displacements. This structural
response was a consequence of an expansive process in the dam concrete due to
chemical interaction between alkaline components of the cement and concrete
aggregates. According to data from the monitoring system of the dam this
phenomenon was first located in the left side of the dam, and has spread out to
most of the dam mass since 1979.
Keywords
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