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

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Abstract

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.

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(modified from [6])

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(modified from Wang et al. [24])

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Abbreviations

a:

Radius of the cone

Bc :

The calculated BqQt

Bm :

The measured BqQt

f s :

Sleeve friction

ia :

The hydraulic gradient at radius r = a

h:

Height of filter ring

k:

Hydraulic conductivity

kh :

Hydraulic conductivity in the horizontal direction

\({{h}_{c}}\) :

The hydraulic conductivity calculated from equations

\({{h}_{l}}\) :

The hydraulic conductivity measured directly from tests

KD :

Dimensionless hydraulic conductivity coefficient

n:

The number of data points

qt :

Cone resistance

SD:

Standard deviation

U:

The rate of cone penetration

ua :

The absolute pore water pressure measured by the piezocone

us :

The initial static pore water pressure

u0 :

Hydrostatic pressure

u2 :

Pore water pressure on the cone shoulder

\(\xi\) :

A reduction factor

\(\theta\),\(\varepsilon\) :

Soil parameter

μ,σ:

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

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Acknowledgements

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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Correspondence to Li-yuan Tong.

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Zhang, M., Tong, Ly. Determination of Hydraulic Conductivity Using a Modified Cylindrical-Half-Spherical Piezocone Model. Int J Civ Eng 17, 161–170 (2019). https://doi.org/10.1007/s40999-017-0154-2

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  • DOI: https://doi.org/10.1007/s40999-017-0154-2

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