Electrical Resistivity Cone Penetration Testing at the Treasure Island National Geotechnical Experimentation Site

金银岛国家岩土工程试验场电阻率触探测试

• 批准号: 9712852
• 负责人: Jean Benoit
• 金额: $ 4.99万
• 依托单位: University of New Hampshire
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-06-01 至 1998-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9712852&HistoricalAwards=false
• 关键词: Electrical; Resistivity; Cone; Penetration; Testing

9712852 Benoit This project addresses the evaluation of a novel field technique to be used at the Treasure Island National Geotechnical Experimentation Site (NGES) in San Francisco, California; the objective being to evaluate the insitu void ratio and soil fabric at this site. This technique consists of vertical and horizontal measurements of soil electrical resistivity using two specially instrumented piezocones simultaneously pushed into the ground. The method, designed by a research group in Italy at the Hydraulic and Structural Research Center of the Italian Electricity Agency (ENEL-CRIS), allows continuous electrical resistivity measurements in the vertical direction for each probe and in the horizontal direction between the two probes. The results, using groundwater and soil samples, are calibrated against laboratory tests on samples reconstituted at various densities. This field technique permits a large volume of soil to be tested, avoiding the unwanted remolding effects surrounding the device. Because of the difficulty in obtaining undisturbed insitu samples for laboratory testing of sands, this insitu method shows great potential in providing parameters needed for the prediction of the dynamic response of soils subjected to earthquake loading. The potential of this insitu electrical resistivity cone penetration test to provide new soil parameters to evaluate the earthquake response of natural sand deposits will advance the state-of-the-art and permit rapid and cost- effective methods for characterization of cohesionless soils.

9712852 Benoit这个项目介绍了在加利福尼亚州旧金山的金银岛国家岩土岩石技术实验地点（NGES）使用的新型现场技术的评估；目的是评估该地点的源空隙比和土壤织物。 该技术包括垂直和水平测量土壤电阻率，同时使用两个特殊仪器的压电酮。 该方法是由意大利的一个研究小组在意大利电力局（ENEL-CRIS）的液压和结构研究中心设计的，可以在每个探针的垂直方向和两个探针之间的水平方向上进行连续的电阻率测量。 使用地下水和土壤样品的结果对针对在各种密度重构的样品进行实验室测试进行了校准。 这种现场技术允许进行大量的土壤进行测试，从而避免了设备周围的不必要的倒出效果。 由于难以获得未经扰动的隔离样品进行沙子实验室测试，因此这种initu方法在预测发生地震载荷的土壤的动态响应所需的参数方面显示出很大的潜力。 这种洋气的电阻率锥体渗透测试的潜力提供了新的土壤参数来评估天然沙子沉积的地震反应，将推进最先进的作品，并允许快速且具有成本效益的方法来表征无凝土壤的土壤。