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

电子压电锥贯入仪（PCPT）作为一种潜在的工程土参数原位测试设备，正得到越来越广泛的认可。该装置在设计上的改进使得同时测量孔隙水压力、锥阻力和滑套摩擦力成为可能。然而，对压电锥体（PCPT）数据的解释往往是复杂的，因为它受到与锥体设计、测试程序和土壤特征相关的许多变量的影响。孔隙压力元件的尺寸和位置对所测孔隙压力的大小有很大的影响，目前还没有公认的标准。本研究计划是一项综合实验研究，利用均匀和可重复的土壤样品来监测孔隙水压力的空间分布。在粘土标定室系统中，在严格控制的边界条件下进行了压锥贯入试验。目标是：1)进行非常全面和详细的参数研究，以扩大目前可用的有限的粘土中压锥渗透试验数据库；2)比较现有的理论和解释程序，以评估其相对优缺点；3)将结果与现有现场数据进行比较。目的是解决目前在解释压锥测试数据期间遇到的复杂性，并协助验证未来提出的理论。

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.