International Journal of Civil Engineering

, Volume 17, Issue 2, pp 161–170 | Cite as

Determination of Hydraulic Conductivity Using a Modified Cylindrical-Half-Spherical Piezocone Model

  • Mingfei Zhang
  • Li-yuan TongEmail author
Research paper


To obtain more accurate values of in situ hydraulic conductivity, the present paper has outlined a new method based on the analysis and comparison of existing methods using piezocone data. Owing to results obtained from many numerical simulations and in situ tests, more substantial assumptions are proposed as being more suitable: (1) the flow surface of pore water is assumed to be cylindrical-half-spherical in shape, and (2) the negative exponential function rules the distribution of excess pore water pressure in the soil around the cone. A comparison is carried out between the proposed approach and existing methods based on the graphical and statistical analysis of test data obtained from Quaternary deposits in the Yangtze Delta region. According to the qualitative graphical analysis, the proposed method can evaluate the hydraulic conductivity of soil more accurately. Five different indices and a new graphical analysis using cumulative frequency can be utilized to assess the similar equations. In addition, the results revealed the accuracy and validity of the proposed method, with these methods. The reasonable assumptions, logical derivation, and mathematical analysis together indicate the academic value and application potential of the proposed method. This model and the graphical analysis using cumulative frequency have important guiding significance for the similar analysis.


Hydraulic conductivity CPTU Cylindrical-half-spherical flow model Statistical assessment Cumulative frequency 



Radius of the cone


The calculated BqQt


The measured BqQt


Sleeve friction


The hydraulic gradient at radius r = a


Height of filter ring


Hydraulic conductivity


Hydraulic conductivity in the horizontal direction


The hydraulic conductivity calculated from equations


The hydraulic conductivity measured directly from tests


Dimensionless hydraulic conductivity coefficient


The number of data points


Cone resistance


Standard deviation


The rate of cone penetration


The absolute pore water pressure measured by the piezocone


The initial static pore water pressure


Hydrostatic pressure


Pore water pressure on the cone shoulder


A reduction factor


Soil parameter


The mean and standard deviation

\({{\sigma }_{v0}}\)

The total overburden stress

\(\sigma {{\prime }_{v0}}\)

The initial vertical effective stress

\(\Delta \dot{V}\)

The rate of volume penetration



Much of the research work described herein was funded by the National Natural Science Foundation of China (NSFC) (Grant No. 4157020433) and Project of the National Twelve-Five Year Research Program of China (Grant No. 2012BAJ01B02). These financial supports are gratefully acknowledged.


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Copyright information

© Iran University of Science and Technology 2017

Authors and Affiliations

  1. 1.Institute of Geotechnical EngineeringSoutheast UniversityNanjingChina
  2. 2.Jiangsu Key Laboratory of Urban Underground Engineering and Environmental SafetySoutheast UniversityNanjingChina

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