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首页> 外文会议>Canadian Dam Association 3rd Annual Conference, Sep, 2000, Regina, Saskatchewan >EASTEND DAM SPILLWAY FOUNDATION DESIGN AND PERFORMANCE
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EASTEND DAM SPILLWAY FOUNDATION DESIGN AND PERFORMANCE

机译：东端大坝溢洪道基础设计和性能

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The replacement of the spillway at Eastend Dam, Eastend, Saskatchewan was undertaken in 1995-96. The replacement was required due to concrete deterioration after approximately 60 years of service and to accommodate a future increase in the full supply level of 1.2 m. From the alternatives considered, the option selected for implementation was based on utilizing the existing spillway location and including portions of the original spillway structure. The project presented difficult geotechnical considerations including up to 5.3 m of soft to very soft soils below the existing foundation base and high water table as well as clay shale underlying the surficial soft soils. The transformation of the structure from a gated, sharp-crest weir vertical drop structure to a reinforced concrete gated ogee weir chute spillway required up to 3.55 m of granular fill to be placed between the existing slab and the underside of the proposed chute. Additional loading on the foundation as a result of the granular fill required an upgrade of the foundation capacity with 27 steel pipe piles having a diameter of 400 mm driven to depths of up to 21.4 m. Pile caps were utilized to transfer load from the granular fill to the piles. Special tests were devised to design the gradation of the granular material to minimize settlement after compaction and saturation. The unique design of the foundation warranted the installation of 3 pair of hydraulic settlement gauges to compare settlement of the pile caps and foundation slab. Settlement of the chute structure was monitored with 72 reference pins installed on the chute floor slab, walls and piers. Four years of data from the instrumentation plus observations during visual inspections indicate satisfactory performance of the structure.
机译：萨斯喀彻温省Eastend的Eastend大坝的溢洪道更换工作于1995-96年进行。由于混凝土在使用大约60年后会变质，因此需要更换，以适应将来1.2 m的全部供应量增加。从考虑的备选方案中，选择实施的选项是基于利用现有溢洪道位置，并包括原始溢洪道结构的部分。该项目提出了困难的岩土工程考虑因素，包括在现有基础和高地下水位以下高达5.3 m的软土至极软土，以及表层软土下面的粘土页岩。要将结构从带门的尖顶堰垂直降落结构转换为带钢筋混凝土的带门的ogee堰斜槽溢洪道，需要在现有平板和拟建斜槽的下侧之间放置多达3.55 m的颗粒填料。由于颗粒状填充而在基础上产生的额外载荷要求使用27个直径为400 mm的钢管桩将基础能力提升至21.4 m，从而提高基础承载力。利用桩帽将载荷从粒状填料转移到桩上。设计了特殊的测试来设计颗粒材料的等级，以最大程度地减少压实和饱和后的沉降。地基的独特设计保证了安装三对液压沉降计，以比较桩帽和地基板的沉降。斜槽结构的沉降通过安装在斜槽地板，墙壁和墩台上的72个参考销进行监控。来自仪器的四年数据加上目视检查期间的观察结果表明该结构的性能令人满意。

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