Informatics Publishing Limited

Hongyang Zhang ¹, Xianqi Zhang ², Xu Li ³, Cundong Xu ⁴

Affiliations
1 Dike Safety and Disaster Prevention Engineering Technology Research Center of the Ministry of Water Resources, CN
2 School of Water Conservancy, North China University of Water Resources and Electric Power/Collaborative Innovation Center of Water Resources Efficient Utilization and Protection Engineering, Henan Province, Zhengzhou, CN
3 Lu Xu Construction Co., Ltd. of Henan Province, CN
4 School of Water Conservancy, North China University of Water Resources and Electric Power/Collaborative Innovation Center of Water Resources Efficient Utilization and Protection Engineering, Henan Province, Zhengzhou, IN

Abstract

When earth-rockfill dam's coarse aggregates are immersed in water under certain stress, particles will be lubricated and immersed mineral particles will soften so they will slip against each other, break, and realign. Thus deformation will occur and the stress will redistribute in the soil mass. The deformation is called wetting deformation since it happens when dry soil becomes wet while the stress state remains unchanged. This paper studies the mechanism and analytical approach of wetting deformation. It devises a method for calculating wetting deformation based on single-line method and P-Z constitutive model and then applies the method to the static calculation of Shuangjiangkou earth-rockfill dam. It is proved that this method can reasonably reflect the influence of dam's wetting deformation on its general deformation during the storage period.

Keywords

Coarse Aggregates, Wetting Deformation, P-Z Model, Volumetric Strain, Axial Strain, Stress Level.

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Zelin Ding ¹, Cundong Xu ¹, Shifeng Yang ¹

Affiliations
1 School of Water Conservancy, North China University of Water Resources and Electric Power/Collaborative Innovation Center of Water Resources Efficient Utilization and Protection Engineering, Henan Province, Zhengzhou, CN

Abstract

Hydraulic model test is used to explore the stress distribution and bearing capacity of cement-sand-gravel dam foundation. Through stepwise and multi-level loading of the dam body, the stress distribution of the dam body under hydraulic load is obtained along with the stress distribution under the dead weight of the dam body. Experiment shows that under the action of dead weight, both the dam body and the foundation are subjected to compression, with higher compressive stress in the middle and lower stress on the two sides. When the upstream hydraulic load acts on the dam body, there is a change of stress distribution pattern of the dam body. The largest stress occurs in the middle and downstream part of the dam foundation. The radial displacement of the dam body changes to displacement in downstream direction. The displacement of the upper part of the dam body is higher than that of the lower part of the dam body, with the maximum displacement occurring in the middle of the dam.

Keywords

Cement-Sand-Gravel Dam, Model Test, Stress Analysis, Dead Weight of the Dam Body.

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