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~WATTAB

 

~WATTAB, Lab1, Y1, Z1, X2, Y2, Z2, NPOINTS, MAT, LINE1, LINE2, PC1, PC2, EQTYP

Defines the saturation line

PREP7 : GEOTECHNICAL MODULE: Seepage

SOLUTION: GEOTECHNICAL MODULE: Seepage

Lab1

If Lab1 = CLEAR

Deletes the saturation line. The remaining fields are not used.

If Lab1 = X1

X coordinate of the initial point of the saturation line.

Y1

Y coordinate of the initial point of the saturation line.

Z1

Z coordinate of the initial point of the saturation line.

X2

X coordinate of the end point of the saturation line.

Y2

Y coordinate of the end point of the saturation line.

Z2

Z coordinate of the end point of the saturation line.

MAT

Material used to mesh the area from which the saturation line belongs to. By default, the material of the lowest number defined by CivilFEM is taken.

NPOINTS

Number of points to be generated along the saturation line.

LINE1

The line number on which the initial point of the saturation line leans.

LINE2

The line number on which the end point of the saturation line leans.

PC1

Constraint condition of the initial point of the saturation line.

FIXED	The point is fixed throughout the whole calculation process
EXIT	The point moves along a seepage surface

PC2

Constraint condition of the end point of the saturation line.

FIXED	The point is fixed throughout the whole calculation process
EXIT	The point moves in a seepage surface

EQTYP

Specifies how to generate the calculation points of the saturation line, if PC1 or PC2 has EXIT as constraint condition. If the abscissa is mobile, the horizontal coordinates of the calculation points are recalculated for each step in relation with the exit point. If the abscissa is fixed, the penultimate point is located at the horizontal coordinate of the highest point of the line over which the exit condition is placed.

MOVABLE	Mobile abscissa (default value)
FIXED	Fixed abscissa

Notes

- This command defines a set of calculation points that will be used by the ~WTSOLVE command for calculating the saturation line position. These calculation points are included in the model as keypoints.

- The initial and end point of the saturation line rest on two lines that must be specified. When generating those points these lines are automatically divided by two and the program eliminates the top line.

- The restraint condition of the initial and end point of the saturation line must be specified. Additionally, the boundary condition of the lines over which those points rest must also be specified in order to allow the points to move in a right way.

- The fixed abscissa option leads to less precise results but to a more assured convergence than the default option of movable abscissa.

- The initial saturation line (first approximation) will be a straight line made up of the specified number of points (NPOINTS).

Menu Path

Main Menu > CIVIL Preprocessor > Geotech. Mod. > Seepage > Define > Saturation line

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