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首页> 外文会议>GEO-DENVER 2007 >Possible Evaluation of Overconsolidation Ratio of Clayey Soils from Piezocone Penetration Tests
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Possible Evaluation of Overconsolidation Ratio of Clayey Soils from Piezocone Penetration Tests

机译：压电渗透试验可能评估粘土的超固结率

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The purpose of this paper is to evaluate the capability of existing interpretation methods and develop new methods to reasonably predict the overconsolidation ratio (OCR) of clayey soils utilizing the piezocone penetration test (PCPT) data. These existing methods include the Schmertmann method, Kulhawy and Mayne method, and the Chen and Mayne methods using pore pressure measurements either at the cone tip (u1) or at the cone base (u2). Seven sites in Louisiana were used for this study. At each site, in-situ PCPT tests were performed and soundings of cone tip resistance, qc, sleeve friction, fs, and pore pressures at different locations (u1 and u2) were recorded. High quality Shelby tube samples were collected close to the PCPT tests and used to conduct laboratory oedometer consolidation tests to evaluate the reference OCR values. The predicted OCR values from different methods were compared with the laboratory OCR values. The results showed that all the investigated PCPT methods overpredict the laboratory calculated OCR. The collected data were further used to develop two new PCPT methods that can estimate the OCR reasonably.
机译：本文的目的是评估现有解释方法的能力，并开发新方法，利用压电渗透试验（PCPT）数据合理预测黏土的超固结率（OCR）。这些现有方法包括Schmertmann方法，Kulhawy和Mayne方法，以及Chen和Mayne方法，这些方法使用在锥尖（u1）或锥底（u2）的孔隙压力测量。这项研究使用了路易斯安那州的七个地点。在每个位置进行了原位PCPT测试，并记录了在不同位置（u1和u2）的锥头阻力，qc，套筒摩擦，fs和孔隙压力的测量值。接近PCPT测试收集高质量的谢尔比试管样品，并用于进行实验室里程计巩固测试，以评估参考OCR值。将来自不同方法的预测OCR值与实验室OCR值进行比较。结果表明，所有研究的PCPT方法都高估了实验室计算出的OCR。收集到的数据被进一步用于开发两种可以合理估计OCR的新PCPT方法。

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