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

利用电子压电式压电式贯入仪(PCPT)作为一种潜在的现场测试设备来评价工程土参数正得到广泛的认可。对该装置的设计进行了改进，使其能够同时测量孔压、锥体阻力和套筒摩阻。然而，压电锥(PCPT)数据的解释往往很复杂，因为它受到与压电锥的设计、测试程序和土壤特性有关的许多变量的影响。关于孔压元素的大小和位置还没有被接受的标准，这对测量的孔压的大小有很大的影响。这项研究计划是一项全面的试验研究，使用均质的和可重复的土样来监测孔压的空间分布。压电锥贯入试验是在严格控制的边界条件下在粘土校准室系统中进行的。其目的是：1)进行非常全面和详细的参数研究，以扩展目前可用的有限的粘土中压电触探试验的数据库；2)比较现有的理论和解释方法，以评估它们的相对优缺点；3)将结果与现有的现场数据进行比较。其目的是解决目前在解释压电锥测试数据时遇到的复杂性，并帮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.