Statistical Assessment of Simplified CPTU-Based Hydraulic Conductivity Curves

Abstract

Classical theoretical approaches to evaluate CPTU-based hydraulic conductivity gave the expression of a bilinear relation defined by K D - B q Q t , for undrained and drained soils. In fact, a dividing line may be selected with a certain degree of subjectivity, and several undrained/drained points occur in opposite sites, which may make us doubt the necessity of two intersecting lines to distinguish the undrained and drained soils. And a uniform and relatively simple curve including an arc, parabola, or ellipse correlation may be more suitable and accessible from a practical point of view. A database in the Yangtze Delta region has been collated to assess the three curves compared with the bilinear line. With the graphical and statistical analyses, the results indicate that the arc, parabola, and ellipse simplified curves could give better performance than the bilinear line. Through the statistical analyses and the number of variables, the overall best curve was the ellipse with only two variables, which is expected to improve the application scope and simplicity of hydraulic conductivity.

Geotechnical Characteristic Assessments of Floodplain Soils Using SCPTU Data in Nanjing, China

“…Due to these advantages, the Holland CPTU was introduced into China in the early 1980s. Several research projects on CPTU were performed at Shanghai-Nanjing highway and Zhujiang Delta area [10,11]. Similar probe cones were produced by Nanjing Hydraulic Research Institute and other research institutes.…”