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A Geotechnical Solution to Setback Flood Control Systems

机译:挫折洪水控制系统的岩土解决方案

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摘要

The City of Grand Forks, North Dakota is located along the Red River near its confluence with the Red Lake River. In April 1997, a 210-year flood event overtopped the levee system, resulting in the evacuation of the city and subsequent damages to residential and commercial structures and infrastructure exceeding $1 billion. Following this event, the U.S. Army Corps of Engineers (COE) began designing a higher flood control system, including levees and floodwalls, to contain future flood events. Because of the presence of deep, weak soil deposits along the riverbanks, analyses indicated that the system (primarily levees) would need to be setback from their existing location to achieve global slope stability, which would result in the taking of over 400 structures (mainly residential homes). As a result, the City of Grand Forks (City) retained Shannon & Wilson, Inc. (S&W) to explore alternatives to the setback levee system at four reaches along the alignment. This paper discusses the alternatives analyzed; the properties of the weak soil deposits; design methodology and criteria; the results of limit equilibrium and soil-structure interaction stability analyses; and the final design and construction of one alternative (a concrete cylinder pile wall) along a key river reach.
机译:北达科他州大福克斯市位于红河沿岸,与红湖河交汇处。 1997年4月,为期210年的洪水事件使堤防系统超支,导致城市撤离,随后对住宅,商业结构和基础设施的破坏超过10亿美元。此事件发生后,美国陆军工程兵团(COE)开始设计更高的防洪系统,包括堤坝和防洪墙,以容纳未来的洪水事件。由于沿河两岸存在着深而薄弱的土壤沉积物,因此分析表明,该系统(主要是堤防)需要从其现有位置折回以实现全球性的边坡稳定性,这将导致采用400多个结构(主要是住宅)。结果,大福克斯市(市)保留了Shannon&Wilson,Inc.(S&W)来研究沿路线的四个河段的倒退堤防系统。本文讨论了所分析的替代方案;薄弱的土壤沉积物的特性;设计方法和标准;极限平衡和土-结构相互作用稳定分析的结果;以及在主要河段沿岸的另一种方案(混凝土圆柱桩墙)的最终设计和施工。

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