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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

基本信息

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

项目摘要

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本项目旨在评估将在加州州弗朗西斯科金银岛国家岩土工程实验场（NGES）使用的一种新的现场技术;目的是评估该场地的原位孔隙比和土壤结构。该技术包括使用两个同时推入地下的特殊仪器压锥对土壤电阻率进行垂直和水平测量。该方法由意大利的一个研究小组在意大利电力局水力和结构研究中心（ENEL-CRIS）设计，允许在每个探头的垂直方向和两个探头之间的水平方向上连续测量电阻率。结果，使用地下水和土壤样品，校准对不同密度的样品重建的实验室测试。这种现场技术允许测试大量土壤，避免了设备周围不必要的重塑效应。由于难以获得原状原位样品的砂的实验室测试，这种原位方法显示出巨大的潜力，在提供所需的参数，预测所需的土壤受到地震荷载的动力响应。这种原位电阻率锥贯入试验提供新的土壤参数来评估天然砂沉积物的地震反应的潜力将推进最新技术水平，并允许快速和成本效益高的方法来表征无粘性土壤。