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GEOTECHNICAL ASPECTS OF LEVEE RELIABILITY ASSESSMENT

机译：堤坝可靠性评估的岩土方面

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Geotechnical investigation and analysis have a significant role in the assessment of levee reliability. This paper presents the major components of a geotechnical investigation and analysis of a levee system and illustrates the breadth and depth of those components in an assessment of the Green River Levees in King County, Washington.rnA 25.5 mile reach of the lower Green River flowing through the Lower Valley in western Washington has 47 separate levees protecting people, possessions, and rural, residential, commercial and industrial properties. The assessed value of the property improvements alone is $2.6 billion (2009 dollars). The levees are a mix of facilities ranging from well-engineered and well-maintained structures to early 20th century embankments of uncertain origin and construction. A geotechnical risk assessment of these facilities was completed to assist the County in ranking the levees according to their relative reliability.rnThe geotechnical investigation included a review of the geologic setting and river morphology, field reconnaissance, subsurface explorations, field instrumentation, and laboratory testing. Geotechnical analysis consisted of seepage and slope stability calculations. Stage-probability-of-failure functions were developed for input to a risk-based cost-benefit analysis program to estimate expected annual damage from flooding.rnThe outcome of the assessment was relative ranking of the levees in terms of their geotechnical reliability and the relationship of that reliability to the economic impact on the protected community.
机译：岩土工程调查和分析在评估堤防可靠性方面具有重要作用。本文介绍了堤坝系统的岩土工程调查和分析的主要组成部分，并在华盛顿州金县的绿河堤岸评估中说明了这些组件的广度和深度.rn23.5英里的下游绿河流经华盛顿西部的下山谷有47个单独的堤防，用于保护人员，财产以及农村，住宅，商业和工业财产。仅财产改善的评估价值就达26亿美元（2009年美元）。堤防是各种设施的混合体，从精心设计和维护良好的结构到20世纪初路堤和来源不确定的建筑。完成了对这些设施的岩土工程风险评估，以帮助该县根据其相对可靠性对堤防进行排名。rn岩土工程研究包括对地质环境和河流形态，田野勘察，地下勘探，田野仪器和实验室测试的审查。岩土工程分析包括渗流和边坡稳定性计算。开发了阶段失效概率函数，以输入到基于风险的成本效益分析程序中，以估计洪水带来的预期年度损失。rn评估的结果是堤坝在岩土工程可靠性及其关系方面的相对排名。可靠性对受保护社区的经济影响。

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