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An Approach to Evaluate Hydraulic Conductivity of Soil Based on CPTU Test

2013; Taylor & Francis; Volume: 31; Issue: 3 Linguagem: Inglês

10.1080/1064119x.2012.676154

1521-0618

Junpeng Wang, Ye‐Shuang Xu, Lei Ma, Shui‐Long Shen,

Soil and Unsaturated Flow

Abstract This article presents a new approach to estimate hydraulic conductivity of soil from cone penetration test with pore water pressure measurement (referred to as CPTU hereafter). The proposed approach is based on the test result of the spherical cavity expansion of the soil at the tip of a pile. During the piezocone penetration, the flow shape of pore water around the tip of the cone is assumed to be a spherical crown and induced excess pore water is assumed to dissipate from the crown surface. Based on this assumption, a bi-linear relation between the piezocone sounding metric (which is the product of the pore water pressure ratio Bq and the tip resistance Qt) and the hydraulic conductivity index KD is derived to estimate the hydraulic conductivity of the soil layer. The derived approach expands the applicable range of existing approaches in the literature. It is demonstrated that the proposed approach can cover the entire tip angles of the cone and the modified equation can fit the CPTU test data well. Keywords: angle of cone tipbi-linear relationCPTUhydraulic conductivity Acknowledgments The research work described herein was funded by the National Nature Science Foundation of China (NSFC) (Grant Nos. 41102175 and 41072209). These financial supports are gratefully acknowledged.