Comprehensive Investigations of Piezocone Penetration Tests in a Clay Calibration Chamber and Comparison with Field Test Data

粘土校准室压电锥渗透试验的综合研究及与现场试验数据的比较

• 批准号: 9213807
• 负责人: George Voyiadjis
• 金额: $ 3.5万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-09-01 至 1994-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9213807&HistoricalAwards=false
• 关键词: Comprehensive; Investigations; Piezocone; Penetration; Tests

The use of the electronic piezocone penetrometer (PCPT) as a potential insitu testing device to evaluate engineering soil parameters is gaining wide acceptance. Improvements in the design of this device have made it possible to measure simultaneously pore water pressure, cone resistance and sleeve friction. However, interpretation of piezocone (PCPT) data is often complex as it is influenced by a number of variables related to the design of the cone, testing procedures and soil characteristics. No standards have been accepted regarding the pore pressure element size and location, which has a significant effect on the magnitude of the measured pore pressures. This research program is a comprehensive experimental investigation using homogeneous and reproducible soil specimens instrumented to monitor the spatial distribution of pore water pressure. Piezocone penetration tests are performed under strictly controlled boundary conditions in a clay calibration chamber system. The objectives are: 1) To conduct very comprehensive and detailed parametric studies to expand the currently available limited data base of piezocone penetration tests in clay, 2) compare existing theories and interpretation procedures to assess their relative merits and demerits, and 3) to compare the results with available field data. The aim is to resolve the complexities currently met during the interpretation of piezocone test data and to assist in the verification of future proposed theories.

使用电子压电锥入度计（PCPT）作为评估工程土壤参数的潜在原位测试设备正在获得广泛接受。 该装置设计的改进使得同时测量孔隙水压力、锥体阻力和套筒摩擦成为可能。 然而，压电锥 (PCPT) 数据的解释通常很复杂，因为它受到与锥体设计、测试程序和土壤特性相关的许多变量的影响。 关于孔隙压力元件的尺寸和位置，尚未接受任何标准，这对测量的孔隙压力的大小有显着影响。 该研究计划是一项综合实验研究，使用均质且可重复的土壤样本来监测孔隙水压力的空间分布。 压电锥渗透测试是在粘土校准室系统中严格控制的边界条件下进行的。 目标是：1) 进行非常全面和详细的参数研究，以扩展目前可用的粘土压电锥渗透测试的有限数据库，2) 比较现有的理论和解释程序，以评估其相对优点和缺点，3) 进行比较可用现场数据的结果。 目的是解决目前在解释压电锥测试数据过程中遇到的复杂性，并协助验证未来提出的理论。