Select the soil model method on which the software will base its calculations. Three different soil model methods are available, each with its own set of soil properties.
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American Lifelines Alliance (Sand/Gravel)
This is the default model is that is presented for granular soils in "Appendix B" of the America Lifelines Alliance document Guidelines for the Design of Buried Steel Pipe. This model was developed jointly by the American Society of Civil Engineers and the Federal Emergency Management Agency in July 2001 (addenda through February 2005.
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American Lifelines Alliance (Clay)
This model is for clay soils and from the same document as American Lifelines Alliance (Sand/Gravel).
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CAESAR II Basic Model
A modified implementation of the method described by L.C. Peng in his two-part article "Stress Analysis Methods for Underground Pipe Lines", published in Pipe Line Industry (April/May 1978).
For more information, see Soil Models.