天生桥一级水电站混凝土面板堆石坝趾板设计

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在天生桥一级水电站混凝土面板堆石坝趾板设计中,对趾板的基础、结构及施工做了如下处理:(1)基础必须置于坚硬的、不可冲蚀的、可灌浆的岩石基础上,天生桥面板堆石坝坝基是中三叠系岩石,趾板区存在着软弱夹层、断层、破碎带,在趾板附近要做特殊处理,处理长度根据断层的抗渗透比降确定;(2)趾桥宽度根据允许渗流比为15而定,厚度和宽度要相对固定,以便施工;(3)不设伸缩缝,允许有施工缝;(4)配筋按单层双向配置,每向配筋率为0.3%~0.35%,趾板与基础间设锚筋. In the design of toe slab of concrete face rockfill dam of Tianshengqiao I Hydropower Station, the foundation, structure and construction of toe slab are treated as follows: (1) The foundation must be placed on the basis of hard, non-erosionable and groutable rock The Tianshengqiao deck rockfill dam is a medium-Triassic rock. There are weak intercalations, faults and broken zones in the plinth area. Special treatment should be done near the plinth. The length of treatment is determined according to the anti-infiltration ratio of the fault. (2) The width of toe bridge shall be determined according to the allowable seepage ratio of 15, and the thickness and width shall be relatively fixed so as to facilitate the construction; (3) No expansion joints are allowed and construction joints are allowed; (4) Reinforcing bars shall be arranged in single- Rate of 0.3% to 0.35%, plinths and anchorage between the foundation.
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