Properties of soil can change according to region. To have reliable modelling results, you should look for the properties of soil for a specific region, if you want to make soil-pipeline interaction modelling for a specific region. There are papers about the properties of soil for specific regions. If the region is not important for you, just use any of them. For basic properties; http://landresources.montana.edu/swm/documents/Final_proof_SW1.pdf may be helpful for you.
Also you may find some useful information in this (Brady, Nyle C., and Ray R. Weil. The nature and properties of soils. No. Ed. 11. Prentice-Hall Inc., 1996.) book.