This tutorial will demonstrate the Excess Pore Pressure (Undrained Loading) feature of Slide, which allows you to account for sudden increases in pore pressure due to rapidly applied loading conditions. The excess pore pressure is calculated using the “B-bar” method, in which the change in pore pressure is assumed to be directly proportional to a change in vertical stress.
The model features an embankment constructed over a clay foundation. The weight of the embankment will generate undrained pore pressure in the clay foundation layers.
Excess Pore Pressure (click to view PDF file of tutorial)
Topics Covered in this Tutorial
b-bar method overview
excess pore pressure
initial pore pressure
loading due to embankment weight
slip surface query
graph pore pressure
decrease in safety factor
Embankment construction creates undrained loading in clay foundation layers