Hydraulic Conductivity

Hydraulic Conductivity 1

The hydraulic conductivity (permeability) method 1 ( $\begin{array}{l}K \quad1\end{array}$ ) in Hydraulic_Conductivity_1_Min and Hydraulic_Conductivity_1_Max are defined in the following table. Soil Behaviour Type Robertson et al. 1986 or Robertson et al. 1986 q_c vs. R_f must be calculated for this correlation to be defined.

Zone	Soil Behaviour Type (SBT)	Range of hydraulic conductivity (permeability) K (m/s)
1	Sensitive fine grained	3x10^-9 to 3x10^-8
2	Organic soils	1x10^-8 to 1x10^-6
3	Clay	1x10^-10 to 1x10^-9
4	Silty clay to clay	1x10^-9 to 1x10^-8
5	Clayey silt to silty clay	1x10^-8 to 1x10^-7
6	Sandy silt to clayey silt	1x10^-7 to 1x10^-6
7	Silty sand to sandy silt	1x10^-5 to 1x10^-6
8	Sand to silty sand	1x10^-5 to 1x10^-4
9	Sand	1x10^-4 to 1x10^-3
10	Gravelly sand to dense sand	1x10^-3 to 1
11	Very stiff fine-grained soil	1x10^-8 to 1x10^-6
12	Very stiff sand to clayey sand	3x10^-7 to 3x10^-4

Robertson (2009), pp41, Table 6

Hydraulic Conductivity 2

The hydraulic conductivity (permeability) method 2 ( $\begin{array}{l}K \quad2\end{array}$ ) in Hydraulic_Conductivity_2_Min and Hydraulic_Conductivity_2_Max are defined in the following table. Soil Behaviour Type Robertson 1990 or Robertson 1990 Extrapolated must be calculated for this correlation to be defined.

Zone	Soil Behaviour Type (SBTN)	Range of hydraulic conductivity (permeability) K (m/s)
1	Sensitive fine grained	3x10^-9 to 3x10^-8
2	Organic soils	1x10^-8 to 1x10^-6
3	Clay	1x10^-10 to 1x10^-9
4	Silt mixtures	3x10^-9 to 1x10^-7
5	Sand mixtures	1x10^-7 to 1x10^-5
6	Sands	1x10^-5 to 1x10^-3
7	Gravelly sands to dense sands	1x10^-3 to 1
8	Very stiff sand to clayey sand	1x10^-8 to 1x10^-6
9	Very stiff fine-grained soil	1x10^-8 to 1x10^-6

Robertson (2009), pp41, Table 7

Hydraulic Conductivity 3

The hydraulic conductivity (permeability) method 3 ( $\begin{array}{l}K \quad3\end{array}$ ) in Hydraulic_Conductivity_3_Min and Hydraulic_Conductivity_3_Max are defined in the following table. $\begin{array}{l}I_c\end{array}$ is from Soil_Behaviour_Type_Index_1

SBTn	Soil Behaviour Type	$\begin{array}{l}K_{min}\end{array}$ (m/s)	$\begin{array}{l}K_{max}\end{array}$ (m/s)	$\begin{array}{l}I_c\end{array}$
1	Sensitive fine grained	3E-10	3E-08	NA
2	Organic soils-Clay	1E-10	1E-08	>3.6
3	Clay	1E-10	1E-09	2.95-3.6
4	Silt mixtures	3E-09	1E-07	2.6-2.95
5	Sand mixtures	1E-07	1E-05	2.05-2.60
6	Sand	1E-05	1E-03	1.31-2.05
7	Sand to gravelly Sand	1E-03	1E+00	<1.31
8	Very dense/ stiff soil	1E-08	1E-03	NA
9	Very stiff fine grained	1E-09	1E-07	NA

Robertson (2010), paper 2-51

Hydraulic Conductivity 4

The hydraulic conductivity (permeability) method 4 ( $\begin{array}{l}K \quad4\end{array}$ ) in Hydraulic_Conductivity_4 are defined in the following table. $\begin{array}{l}I_c\end{array}$ is from Soil_Behaviour_Type_Index_1 Robertson (2010), paper 2-51

$\begin{array}{l}\text{When} \quad 1.0 < I_c \leq 3.27, \quad k=10^{(0.952 – 3.04\cdot I_c)} \quad (m/s)\\ \ \\ \text{When} \quad 3.27 < I_c < 4.0, \quad k=10^{(-4.52 – 1.37\cdot I_c)} \quad (m/s)\end{array}$

Robertson (2010), paper 2-51

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