Model tests on size effects of dam rockfill materials

WU Shuaifeng; SUN Miaojun; MA Zhigang; WEI Ran; ZHANG Liya

doi:10.11779/CJGE2023S10053

Volume 45 Issue S1

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Chinese Journal of Geotechnical Engineering > 2023 > 45(S1): 11-15. > DOI: 10.11779/CJGE2023S10053

WU Shuaifeng, SUN Miaojun, MA Zhigang, WEI Ran, ZHANG Liya. Model tests on size effects of dam rockfill materials[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(S1): 11-15. DOI: 10.11779/CJGE2023S10053

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Model tests on size effects of dam rockfill materials

1.
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Institute of Water Resources and Hydropower Research, Beijing 100048, China
2.
Power China Huadong Engineering Corporation, Hangzhou 311100, China
3.
Beihang University, Beijing 102206, China

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Received Date: July 04, 2023
Available Online: November 23, 2023

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Abstract

Abstract

With the development of dam construction towards higher dams and larger storage capacity, the dam materials are also developing towards larger particle sizes. However, due to the limitations in conditions and scale, the soil tests need to be conducted in a scaled form, which has led to the issues related to size effects. In this study, a size effect model for the deformation characteristics of dam soil and stone materials is derived and established taking into account the factors such as particle breakage, lateral deformation, dry density and load level. A series of compression experiments are conducted on two typical types of dam building materials, rockfill and gravel with sample sizes ranging from 120 to 1000 mm, revealing the correlation between the size effects of diameter to diameter ratio and crushing rate. The research results indicate that the particle breakage rate decreases with the increase of the diameter to diameter ratio, the compression modulus decreases with the increase of the particle breakage rate, the deformation modulus of the rockfill materials increases with the increase of the diameter to diameter ratio, and the compression modulus of the gravel materials decreases with the increase of the diameter to diameter ratio. The experimental results are consistent with the the calculated ones by the model, proving that the proposed model is of certain applicability and rationality.
- dam material,
- size effect,
- crushing rate,
- diameter ratio,
- compression modulus

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References

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