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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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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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