Uncoupled Limit Equilibrium Analysis of Embedded Walls-Video

Video Transcription

Video Summary

The presentation introduces an uncoupled limit-equilibrium method for analyzing heavy embedded walls, such as diaphragm walls and secant piles. Because these walls are not expected to shear through, a slip surface passing through the wall can misrepresent failure and produce unconservative results. Instead, analyze the upslope and downslope sides separately, representing the passive soil resistance in front of the wall as an allowable force: full passive pressure reduced by a factor of safety.<br /><br />The method does not replace soil–structure interaction analysis, but can support preliminary design, estimate wall displacement, and provide input parameters for numerical analysis. The presenter demonstrates an iterative procedure that selects a passive-pressure factor of safety to meet a target displacement, then compares the resulting global factor of safety with conventional analyses. The example shows that the uncoupled approach gives a more realistic, lower factor of safety than assuming the wall can be crossed by a slip surface. Discussion notes that force location and equilibrium method can affect results.

Keywords

uncoupled limit-equilibrium

embedded walls

passive earth pressure

diaphragm walls

secant piles

soil-structure interaction