Abstract
Diaphragm wall is frequently used as the retaining wall or the cut-off wall for open cut excavation and also used as the wall foundation for super-structure. The trench wall stability is the key issue for the design and construction method of diaphragm wall. The aim of this study is to investigate the diaphragm wall stability during excavation in saturated sand. Field measurement of the pore water pressure variation during diaphragm wall excavation were carried out in the alluvial deposit. The mechanism for the variation of pore water pressure and its effect upon the factor of safety for trench wall stability is investigated.
