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

Alexandra Bestuzheva,Dimitri Gadai,Ilya Tsipurskiy,A Volkov,A Adamtsevich,T Sultanov,A Pustovgar

doi:10.1051/e3sconf/20199702026

Alexandra Bestuzheva, Dimitri Gadai + Show 5 more

Open Access

https://doi.org/10.1051/e3sconf/20199702026

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Abstract

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.

Highlights

Cost-effectiveness of rockfill dams with reinforced concrete face is undeniable, but the more strained are the properties of the stone backfill, the more acute is the problem of case cracking [1, 2]
Face zone width varies based on the ability to fit cementing galleries, allows performing injection in the zone of cracking during repair and restoration works, and more importantly – without reservoir storage decrease, which is impossible for reservoirs with long-term regulation [3]
Selection of the composition for stone-concrete is recommended for the composition of the casting mixture with adjusted grain size composition of the stone backfill

Summary

Introduction

Cost-effectiveness of rockfill dams with reinforced concrete face is undeniable, but the more strained are the properties of the stone backfill, the more acute is the problem of case cracking [1, 2] The solution of this problem often requires soil zoning of the dam body, including creation of a more durable and compact crush-stone or pebble shoulder in the face zone. To select the optimal composition, it is necessary to meet the prescribed properties of the cement-sand mix such as apparent viscosity and stability Utilization of the attachable distribution equipment mounted on a concrete mixer truck that allows equal mixture distribution over 3-4 m width can optimize watering technique of the backfilled crush-stone layer

Results

Discussion

Conclusion