Search for Optimal Composition and an Investigation of Special Material for the Near-Face Zone of a Dam with Reinforced Concrete Face

2019 ◽  
Vol 52 (6) ◽  
pp. 660-668 ◽  
Author(s):  
A. S. Bestuzheva ◽  
D. V. Gadai
Keyword(s):  
Reinforced Concrete ◽  
Optimal Composition ◽  
Face Zone ◽  
Concrete Face

scholarly journals Material stone-concrete – selection of composition for concrete face rockfill dams

2019 ◽  
Vol 97 ◽  
pp. 02026
Author(s):  
Alexandra Bestuzheva ◽  
Ilya Tsipurskiy ◽  
Dimitri Gadai
Keyword(s):  
Strain State ◽  
Optimal Composition ◽  
Design Technique ◽  
Face Zone ◽  
Search Results ◽  
The Face ◽  
Stone Concrete ◽  
Flexible Foundation ◽  
Concrete Face ◽  
Selection Of

The properties of the face zone material as a flexible foundation of the face play an extremely important role in the formation of stress-strain state of rockfill dams with reinforced concrete face. Stone-concrete, made by watering the stone backfill with cement-sand mix containing water-reducing agents is proposed to be used as such foundation in the paper. Methods of selecting the composition of the casting mixture and search results of its optimal composition by the method of factor analysis are given in this paper. The properties of stone-concrete are investigated and a dam design technique is developed based on the selection of optimal properties for the face zone of that material.

scholarly journals Efficiency justification for stone-concrete face zone of rockfill dams with reinforced concrete face

2021 ◽  
Vol 264 ◽  
pp. 03022
Author(s):  
Aleksandra Bestuzheva ◽  
Dimitri Gadai
Keyword(s):  
Reinforced Concrete ◽  
Face Zone ◽  
Deformation Properties ◽  
The Face ◽  
The Difference ◽  
Stone Concrete ◽  
Concrete Face

At present, over 600 dams with a reinforced concrete face are built worldwide; 7 of them are higher than 200 m. However, most of these dams have an inherent disadvantage – face cracking [1, 2, 3], caused by face deformations resulted from the difference in deformation properties of the face and downstream toe. To solve this problem, the authors consider the arrangement of a massive stone-concrete face zone.

scholarly journals Light concrete based on foam polyamidbe-tonic composition

2019 ◽  
Vol 7 (1) ◽  
pp. 70-75
Author(s):  
Левон Маилян ◽  
Levon Mailyan ◽  
Татьяна Голова ◽  
Tat'yana Golova
Keyword(s):  
Reinforced Concrete ◽  
Energy Efficient ◽  
Concrete Strength ◽  
Experimental Studies ◽  
Fiber Reinforced Concrete ◽  
Strength Characteristics ◽  
Building Structures ◽  
Optimal Composition ◽  
Foam Concrete ◽  
Layer Structures

One of the most important tasks of construction is the use of energy-efficient sin-gle-layer structures based on foam concrete and an increase in their bearing ca-pacity due to the use of fiber reinforcement, which will significantly improve the performance properties of fiber-reinforced concrete. Strength characteristics of fibro-foam concrete reinforced with polyamide granules with various types of filler and recommendations for its use in building structures were obtained. These experimental studies allow us to recommend the optimal composition of polyam-ide concrete compositions.

scholarly journals Impact of rockfill dam structure heterogeneity on reinforced concrete face stress-strain state

2019 ◽  
pp. 5-5 ◽  
Author(s):  
Mikhail Sainov ◽  
Igor Egorov ◽  
Konstantin Pak
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Longitudinal Force ◽  
Heterogeneous Structure ◽  
Stress Strain ◽  
Stress Strain State ◽  
Rockfill Dam ◽  
Deformation Properties ◽  
The Face ◽  
Concrete Face

Introduction. One of the main principles in designing modern ultra-high rockfill dams with reinforced concrete face is the principle of zoning rockfill of various quality in the dam body. It envisages that rockfill in the shell upper part should be compacted very carefully in order to minimize to the maximum the deflections of the reinforced concrete face. In the shell lower part it is allowed placing heterogeneous rockfill with less degree of compaction. Analysis of the results of field observations over settlements of the already constructed dams shows that this pattern of zoning may lead to considerable irregularity in distribution of rockfill deformation moduli between the upstream and the downstream parts of the dam. Numerical modeling of the existing Aguamilpa dam carried out by use arlier showed that this effect may be caused by unfavorable stress-strain state of the reinforced concrete face threatening with crack formation. Were come ended using dams of homogenous structure. However, this conclusion caused doubts of some experts. More detailed studies who see results are described in this article were conducted in order to confirm or disprove this conclusion. Materials and methods. The studies were conducted by finite element method on the example of 100 m high rockfill dam. Different alternatives of rockfill deformation properties in the shell upstream and downstream parts were considered. Results. Analysis of the results of studies confirmed the conclusions made earlier about the features of the rockfill dam reinforced concrete face stress-strain state. It was revealed that increase of rockfill deformation in the dam shell downstream part leads to appearance of additional tensile longitudinal force in the face. It increases the risk of appearance of through transversal cracks in the face. However, the heterogeneous structure of the dam shell may not have a decisive impact on stress values because the value of bending moment plays a great role. Conclusions. The results of the fulfilled study as well as modern dam construction practice show the necessity of modifying the traditional pattern of rockfill zoning in the dam body. It is necessary to provide decrease of differences in rockfill deformation of the upstream and downstream parts of the dam.

Simulative Analysis for Reinforced Concrete Face Rockfill Dam of Qianqiao Reservoir

2011 ◽  
Vol 295-297 ◽  
pp. 2413-2416
Author(s):  
Dong Yu Ji ◽  
Wen Liang Ma
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Construction Process ◽  
Operational Process ◽  
Rockfill Dam ◽  
Concrete Face ◽  
Concrete Face Rockfill Dam

In this paper, finite element simulative analysis is proceeded for reinforced concrete face rockfill dam of Qianqiao reservoir. Deducing variation law of the dam’s stress and displacement in construction process and operational process. The analytic results are shown：reinforced concrete face rockfill dam of Qianqiao reservoir is reasonable structure, and every index meets the requirements for design.

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