ABSTRACT
Typical design of temporary retaining wall systems mainly deals with the lateral pressure induced by both the retained material and the additional surcharge loads. However, earthquakes can also induce considerable destabilizing forces while permanently degrading the effective strength of the subsurface. Seismic analysis is essential when evaluating stability and deformation of deep excavations and high/steep slopes, especially in seismically-active regions like the Philippines. This paper discusses the design criteria, approach and methodology adopted for deformation analyses of a secant pile wall system braced with reinforced concrete struts for an excavation project in the Philippines. Emphasis is placed in the approach adopted when considering the seismic demand for temporary structures. Displacements were estimated and reported to be excessive. Recommendations were, however, ignored, and observed damages to the adjacent structures were later on reported during the excavation stage.
