FINITE ELEMENT ANALYSIS OF VERTICAL EXCAVATIONS

Abstract The critical height of vertical excavations in both plane strain and axisymmetry has been considered using fiement analysis incorporating plasticity theory. The numerical solutions obtained are found to compare favourably with values from centrifuge tests and limit analyses. The results are presented in a form which shows the variation of the stability number at failure with hei height/width ratio of the excavation. Graphical output is also included to emphasise the changing mechanisms as this ratio varies.