Seepage

It is the quantity of water contained in the soil, defined on a volumetric basis.

Click

to invoke the Unsaturated Property Function. The function may either be of type independent (P-K/WCC) or relation (T-P/T-K or Sr-P/Sr-K).

P-K/WCC (Pressure Head-Permeability Coefficient Ratio/Water Content Characteristic) [more...]

Permeability Function

The Permeability Coefficient for the unsaturated soil is a function of water content ratio. It decreases with a decrease in water content ratio. Since, water content ratio is a function of pore water pressure and hence, the permeability coefficient is a function of pore water pressure.

Function Type

Select the type of Permeability Function.

Gardner Coefficients

Gardner Coefficient

a,n

Parameters

Frontal Function

K Ratio

Approximation for Residuals

Head pressure (suction)

Van Genuchten

Permeability ratio

a,n,m

Parameters

User Defined

The user can define the K ratio according to the change of negative pore water pressure directly

Pressure

Define pore water pressure. In SoilWorks, the negative pore water pressure should be defined with absolute value.

K Ratio

Define relative coefficient of permeability with pore water pressure

Water Content Function

In Seepage Analysis, the amount of water retained in the soil structure can be expressed in terms of Volumetric Water Content. The curve between Volumetric Water Content and the pore water pressure is known as the Water Content Characteristic curve. If the pore water pressure is positive, the slope becomes equal to the Compression Coefficient (for 1D consolidation).

Function Type

Select the type of Water Content Function.

Van Genuchten

Thetaw

Normalized volumetric water content or relative degree of saturation.

Thetas

Saturation Volumetric water content at natural saturation.

Thetar

Residual volumetric water content

a,n,m

Parameters

User Defined

The user can define the Volumetric water contents according to the change of negative pore water pressure directly

Pressure

Define pore water pressure. In SoilWorks, the negative pore water pressure should be defined with absolute value.

Volumetric Water Content

Define volumetric water content with pore water pressure

Mv is the coefficient of volume compressibility. It is the slope of water content vs. pore pressure graph.

When the option is (a) checked off , the slope of the WCC for the saturated soil is extrapolated from the data obtained from the unsaturated soil. When the option in (b) checked on , the input is taken for Mv. It should be noted that the reported values of Mv are very low and can be taken as 0.

Pressure Load

Pore Pressure

Water Content

Water/moisture content

Scale Factor

T-P/T-K (Pressure Head-Volumetric Water Content-Permeability Coefficient Ratio) [more...]

Ground Type

Select the Ground Type from the database [Standard: JICE (Japan Institute of Construction Engg.)]

**<Ground Type>**
T-P Relationship	T-K Relationship
[G], [G-F], [GF] (JICE	[G], [G-F], [GF] (JICE)
[S], [S-F], [SF] (JICE)	[S], [S-F], [SF] (JICE)
[SF] (JICE)	[M], [C] (JICE)
[M], [C] (JICE)	User Defined
User Defined

Sr-P/Sr-K (Pressure Head-Degree of Saturation-Permeability Coefficient Ratio) [more...]

Ground Type

Select the Ground Type from the database [Standard: JICE (Japan Institute of Construction Engg.)]

**<Ground Type>**
Sr-P Relationship	Sr-K Relationship
[G], [G-F], [GF] (JICE	[G], [G-F], [GF] (JICE)
[S], [S-F] (JICE)	[S], [S-F], [SF] (JICE)
[SF] (JICE)	[M], [C] (JICE)
[M], [C] (JICE)	User Defined
User Defined

Specify options for permeability graph. Determine whether to draw each axis on a log scale.

Specify options for water content graph. Determine whether to draw each axis on a log scale.

It represents the porosity of the sediment deposit which contributes to the fluid flow.

It represents the amount of water which an aquifer releases from storage, per unit mass or volume of aquifer, per unit change in hydraulic head under the condition of full saturation.

Seepage

General Parameters