<< Click to Display Table of Contents >> Navigation:  Chapter 9 Geotechnical Data Management > Geotechnical Tests > Entering Test Data > Soil and Aggregates Tests > Falling Head Permeability > Data Entry > Falling Head Information Tab

This tab is used to specify the constant head test information and results.

 

 

The following can be specified and displayed on this tab:

 

Test Data

 

Use Corrected Sample Specific Gravity: The specific gravity can either be specified or determined from a previous specific gravity test. Check this box to use the specific gravity from a previous specific gravity test. If there is no previous specific gravity test for this sample, this box will not be shown.

 

Specific Gravity: If the User Corrected Sample Specific Gravity box is checked this is the previously determined specific gravity, otherwise this is used to specify the specific gravity to the nearest 0.01 value.

 

Specimen Dry Mass: This is the dry mass of the specimen. It is used to calculate the dry unit weight and initial void ratio.

 

Specimen Height: This is used to specify the specimen height.

 

Specimen Diameter: This is used to specify the specimen diameter.

 

Standpipe Diameter: This is the used to specify the diameter of the standpipe used for the test.

 

Standpipe Initial Height: This is used to specify the initial height of fluid in the standpipe.

 

Units

 

Time Units: This is used to select the units for time.

 

Temperature Units: This is used to select the units for temperature.

 

Length Units: This is used to select the units for length.

 

Mass Units: This is used to select the units for mass.

 

Permeability Units: This is used to select the units for permeability.

 

Results

 

Initial Void Ratio: This is the calculated initial void ratio.

 

Dry Unit Weight: This is the calculated dry unit weight.

 

Average Hydraulic Conductivity: This is the calculated average hydraulic conductivity.

 

Average Permeability at 20°C: This is the average hydraulic conductivity corrected to 20°C (68°F) using the viscosity of the water and test temperature.

 

Regression Permeability: This is the hydraulic conductivity calculated using regression analysis.