This application calculates settlement of a footing placed on a cohesionless material (sand) using the Schmertmann method (Schmertmann, 1970, Schmertmann et al, 1978).
- kPa: This gives stress in kPa (kilopascals), length in m (meters) and settlement in cm (centimeters)
- ksf: This gives stress in ksf (1000 pounds per square foot), length in feet and settlement in inches
- tsf: This gives stress in tsf (tons per square foot), length in feet and settlement in inches
- Thickness: This is the thickness of each layer starting from the surface, not from the bottom of the footing.
- qc: This is the cone tip bearing resistance from a Cone Penetration Test.
- Es: This is the one-dimensional modulus used in the settlement calculation. You may choose to enter this directly. Otherwise, it will be calculated from qc (see below)
- γmoist: Unit weight of soil above the water table.
- γsat: Unit weight of soil above below the water table (saturated).
- Use Es: By default, you must enter qc for each layer and the program converts to the one-dimensional modulus Es (as shown here). By choosing this option, you may enter Es directly.
- Use modified Schmertmann (1978): In Schmertmann et al (1978), more accurate equations were derived for the strain profile and for converting qc to Es
- Subdivide layers: The accuracy of results improves as more layers are entered. Select this option and the program will automatically divide up your soil layers to ensure a good discretization
Details of the settlement calculation can be found here.