Abstract
In this paper, we consider the numerical justification of the possibility to construct a low-cement content concrete gravity dam as an alternative to the traditional solution with a rockfill dam in a Pskem HPP canyon on the river Pskem in Uzbekistan Republic. The calculation studies were performed using the finite element method (FEM), considering the non-linear (elastoplastic) behavior of concrete and foundation rock in the ANSYS software package. Seismic stability of structure was ascertained by means of time-dependent transient dynamic analysis in accordance with the implicit temporal scheme, since such approach allows to trace the development of plastic deformations in the structure and foundation during dynamic loading as well as to evaluate the possible adverse effects. Maximum design earthquake bicomponent accelerogram was involved as an input data for seismic stability analysis. According to the results of the study the conclusions were made about the possibility of construction of a high low-cement content concrete dam in geotechnical, hydrological and climatic conditions of the Pskem HPP site on the Pskem River as well as on the other HPPs of the Chirchik-Bozsu cascade in Uzbekistan Republic, which are now under design. The reported study was funded by RFBR, project number 20-38-90160.
Highlights
At present time there are more than 800 low-cement content concrete dams in the world, ranging in height from 15 m to 250 m (Gilgel Gibe III dam in Ethiopia)
The construction site of the Pskem HPP will be located on the Pskem river in Bostanlyk district of Tashkent region (Uzbekistan Republic), 120 km north-east from Tashkent and 50 km from the existing Charvak HPP (Fig. 1)
There were two extra cases, which were taken into account
Summary
At present time there are more than 800 low-cement content concrete dams in the world, ranging in height from 15 m to 250 m (Gilgel Gibe III dam in Ethiopia). The authors of the article offer an alternative version of the high dam of the Pskem HPP made of low-cement content concrete as well as calculation justification, considering the stage of construction, sediment pressure and seismic exposure [3,4,5,6]. To ensure high reliability of the structure in difficult geological, climatic and seismic conditions, it was considered to involve the main impervious geocomposite liner, which consists of PVC sheets with an effective thickness of 4,0 mm heat-bonded with needlepunched non-woven polypropylene geotextile with 700 g/m2 surface density. According to the ICOLD (International Committee on Large Dams) data, as of 2010, geocomposite impervious systems have been installed on more than 160 different types of dams, demonstrating their high reliability and efficiency [7]
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