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首页> 外文会议>Collaborative management of integrated watersheds >LEVEE SUBSURFACE INVESTIGATION USING GEOPHYSICS, GEOMORPHOLOGY, AND CONVENTIONAL INVESTIGATIVE METHODS
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LEVEE SUBSURFACE INVESTIGATION USING GEOPHYSICS, GEOMORPHOLOGY, AND CONVENTIONAL INVESTIGATIVE METHODS

机译：使用地球物理，地球形态学和常规调查方法进行的地下地下调查

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The Urban Levee Geotechnical Evaluations (ULE) Program is investigating over 400 miles of urban levees in California's Central Valley. Geophysical techniques and geomorphologic mapping were used with drilled borings and cone penetration tests (CPT) to investigate the levees. Collected data were compiled in a geographic information system (G1S) database to produce layered maps used to establish subsurface conditions and assess the continuity of levee and foundation strata. The database will also be available for long-term use in future design and construction projects.rnSchedule and budget limitations and access difficulties to some levee toe locations, limited the project to widely-spaced borings and CPT. These were concentrated on the levee crowns with landside and waterside explorations only at selected locations. To augment and support the exploration-derived data, the results of geophysical and geomorphologic studies were overlain on the boring and CPT logs to evaluate the continuity of stratigraphy, identify potentially problematic conditions, and develop a geologically-based model for assessing levee and levee foundation conditions.rnSeveral geophysical techniques were employed with variable success. This paper compares the relative value of these techniques based on geologic conditions within an area. Case history data from three areas with varying geologic conditions are presented to demonstrate the efficacy and limitations of these techniques. The case studies also illustrate the successes and challenges of large-scale subsurface assessment and combining multiple investigative techniques.
机译：城市堤防岩土工程评估（ULE）计划正在调查加利福尼亚中央谷地超过400英里的城市堤防。地球物理技术和地貌图与钻孔和锥孔渗透试验（CPT）一起用于调查堤防。收集的数据在地理信息系统（G1S）数据库中进行汇编，以生成用于确定地下条件并评估堤坝和地基层连续性的分层地图。该数据库还将可用于将来的设计和建设项目中长期使用。rn计划和预算的限制以及对某些堤坝脚趾位置的访问困难，将项目限制在宽大的镗孔和CPT中。这些仅集中在堤防冠上，仅在选定位置进行陆侧和水侧勘探。为了增加和支持勘探得出的数据，将地球物理和地貌学研究的结果覆盖在钻孔和CPT测井上，以评估地层的连续性，确定潜在的问题条件，并开发基于地质的模型来评估堤坝和堤坝基础条件。采用多种地球物理技术取得了成功。本文根据区域内的地质条件比较了这些技术的相对价值。呈现了来自三个地质条件不同的地区的病历数据，以证明这些技术的有效性和局限性。案例研究还说明了大规模地下评估并结合了多种调查技术的成功与挑战。

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