ABSTRACT
The Knowledge of the increase of pore water pressure in soils due to various loading conditions without drainage is important in both theoretical and applied soil mechanics. When a soil is subjected to rapid loading and if the coefficient of permeability is small, there will be insufficient time for drainage of pore water. This chapter presents mathematical formulations for the excess pore water pressure for various types of undrained loading. The usefulness of the more fundamental definition of pore water pressure is that it enables to predict the excess pore water pressure associated with loading conditions such as plane strain. This can be illustrates by deriving an expression for the excess pore water pressure developed in a saturated soil below the centerline of a flexible strip loading of uniform intensity. An increase in the initial relative density of compaction as well as an increase in the effective confining pressure does increase the soil stiffness.
