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.
In this paper, we consider the issue of assessing the degree of influence of the selected factors on the temperature regime and the thermally stressed state of a concrete gravity dam being built from low-cement concrete for several possible construction scenarios. The studies were carried out in relation to the design and conditions of the construction area of the Pskem hydroelectric complex in the Republic of Uzbekistan. Variation factors were: cement consumption in the mixture, the initial temperature of the concrete mixture, the heat release of cement, the thickness of the laid concrete layer, the month of commencement of work. The environmental factors were the variable ambient temperature during the year by months and the influence of solar radiation. The calculations were carried out taking into account the seasonality of the moment the construction of the structure began. 2 options were considered: autumn-winter with concreting of the zone at the base of the dam from September to February inclusive; spring-summer with concreting of this zone from March to August inclusive. In addition, options were considered taking into account additional heating from exposure to solar radiation and without it. The studies were carried out using the methodology of experiment planning in the search for optimal solutions (method of factor analysis). The numerical experiment was carried out on the basis of the finite element method using the ANSYS software package. Using the method of factor analysis, the influence of the main acting factors on the temperature regime of a gravity dam made of rolled concrete was studied. A variant of a combination of factors is proposed to obtain the most favorable temperature regime. Regression equations are obtained for predicting the temperature regime of concrete gravity dams being built from low-cement content concrete. The results of studies using the factor analysis technique can be used in the design of concrete dams from rolled concrete.
This paper discusses the issue of seepage control in gravity dams made of compacted lean concrete. Several possible design options are outlined. The benefits of using geocomposite impervious blankets are explained. A description of different types of geocomposites is given, including their composition and component parameters. Basic properties of geosynthetics are discussed, along with methods for defining them, such as water permeability, tensile strength, puncture resistance, and ageing. Finally, the main areas for future research are formulated, although it may be helpful to provide more detail on the specific focus of this research.
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