ABSTRACT:

In this paper, stability analysis of the Ertan arch dam was conducted by using three- dimensional nonlinear finite element methods and geomechanical model tests. The results were compared with data of prototype observations before, during and after completion of the dam. A three-dimensional nonlinear F.E.M., TFINE program, based on a damage-fracture mechanics model for jointed rock mass, has been developed and applied to evaluate the stability of the dam. Geomechanical model tests were also carried out to verify the conclusions drawn from numerical computation. A full- scale monitoring system was setup at the dam site, which enabled the observations during construction and operation of the dam. Construction of the dam was finished and the dam has been operated satisfactorily since impoundment of the reservoir in June 1998. The behavior from numerical computation, geomechanical model tests and dam actual observations are in good agreement.

CONFIGURATION OF ERTAN ARCH DAM

The Ertan arch dam is located in the downstream sector of the Y along River in south western China. The geological conditions at the project site are well formed for a high concrete double curvature arch dam. The rock mass at the dam site is generally composed of igneous crystalline rocks. Primary design and optimization were accomplished in 1985 and in 1987 respectively. Construction of the project began in September 1991 and after 7 years the main buildings of the dam were finished. The reservoir was impounded and flood was discharged in June 1998. The up stream face of the dam can be seen from Figure 1 and general layout of the project is shown in Figure 2. The crown cantilever section of the dam body is shown in Figure 3. Detail data about the project can be seen from Table 1.

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