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The strengthening of arch dam foundation is an important engineering measure to ensure the stability of dam abutment and the safety of arch dams. This paper took the reinforcement measures for the foundation of Dongzhuang arch dam as the research object, systematically simulated the discontinuity layer, mud fissures, wide joints and corresponding reinforcement measures of the dam abutment rock mass. The finite element analysis was conducted on the reinforcement effect of the dam foundation using elastic-plastic constitutive law. The calculation results indicate that the foundation reinforcement measures have little effect on the maximum displacement and stress of the dam body, but to some extent, they reduce the yield zone of the dam body and the foundation surface, improving the stress on the dam body. Through overload calculation and analysis, it is found that the foundation reinforcement measures have little effect on the plastic zone of the arch dam body, but the yield zone of the foundation surface is significantly reduced after the foundation reinforcement. The foundation reinforcement measures have a relatively smaller impact on the yield zone volume of fault f5 and muddy fissure Rnj3, but a significant impact on the yield zone volume of large fissure L22. In summary, the foundation reinforcement measures taken for Dongzhuang arch dam have improved the stress on the dam body and foundation, and improved the stability of the dam foundation. [ABSTRACT FROM AUTHOR]

CCS Hydropower Station is the world’s largest impulse hydropower station with the total installed capacity. As the jet speed of impulse turbine is fast, it is sensitive to the doped particles in the high-speed and high-pressure water flow, which will lead to the abrasion of important parts such as nozzle or bucket and reduce the service life of the equipment. In view of the sediment problem in this project, the first consideration was to settle the sediment in the water source reservoir. That is to say, the intake complex was arranged at the lower reaches of the Coca River where the river is wide, so as to reduce the sediment content in the diversion reach. Secondly, the water intake was arranged on the right bank of the river and next to the water intake was arranged the sand sluice gate to ensure the water intake was clear in front of the water intake and minimize the sediment content. The grit chamber was arranged after the sand-sluice and the grit chamber was fully settled after the water was taken. Finally, a compensation reservoir was set at the end of the tunnel to further reduce the sediment content. [ABSTRACT FROM AUTHOR]

The headrace tunnel of CCS project connects the desilting basin of intake complex and compensating reservoir, with a total length of 24.8 km. It’s a free flow tunnel in normal operating condition and change into pressure tunnel when the outlet gate is closed at load rejection. Therefore, a comprehensive analysis of the hydraulic characteristics of the headrace tunnel is needed to ensure the safe operation under various working conditions. In this paper, flow capacity, flow profile, bend flow, flow state transition at different closing times of outlet gate and stilling pool scour were analyzed. The study shows that the flow state of the headrace tunnel is good under normal operating conditions, and when the outlet gate is closed, the transition section between free and pressure flow can be controlled in a small range through closing time adjustment of the outlet gate. [ABSTRACT FROM AUTHOR]

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