| SPECIAL SECTION: ROCK MECHANICS AND ENGINEERING PRATICE FOR LARGE HYDROPOWER STATIONS |
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Foundation grouting times and uplift control of the Baihetan super-high arch dam |
| WEI Pengcheng1, LIN Peng1, WANG Zhilin2, WANG Kexiang2, HUANG Jicun2 |
1. Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China;
2. China Three Gorges Projects Development Co., Ltd., Chengdu 610041, China |
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Abstract The grouting time and uplift control of the dam foundation need to be studied to prevent cracking and to ensure the long-term stability of high dams. A theoretical analysis, numerical simulations and an on-site monitoring feedback analysis were used to develop a partitioned equivalent grouting pressure vector and model for complex geological conditions. The model allows better control of the uplift and tensile stresses in the arch dam for better control of the grouting pressure and better chooses of the appropriate grouting times. The equivalent grouting pressure model was developed from construction monitoring data which was used to develop a feedback analysis for optimizing the grouting pressure with the optimal partitioned equivalent grouting pressure vector. The method was applied to the Baihetan dam foundation to verify that the method can accurately judge the uplift condition of the dam foundation and predict the optimal grouting timing. The study provides a valuable tool for selecting grouting times and for controlling the uplift deformation of similar projects.
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| Keywords
equivalent grouting pressure vector
Baihetan arch dam
uplift control
grouting time
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Issue Date: 04 June 2020
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2020,
Vol. 60
