By J Washbourne, Oxford Polytechnic
This paper was first publsihed in GE’s May 1984 issue
Traditional two-dimensional analysis of the stability of diaphragm wall excavations give apparent factors of safety which are too low. They also give factors of safety reducing with increased depth of wedge, for uniform soil conditions, which is a contradiction of physical reality. In contrast, threedimensional analysis gives a more realistic mathematical model of the true situation.