Stability of Axisymmetric Excavations in Normally Consolidated Clays

摘要

In this report the previous work on stability of axisymmetric excavations is summarized and the critical failure mode is discussed. An upper bound solution for the stability of a vertical excavation of circular cross-section which has no lateral support is presented, where the undrained shear strength of the soil has either a zero or a non zero value at the ground surface and increases linearly with depth.