Abstract: A soilcement mixed gravity retaining wall was used as the deep excavation supporting structure in Wuhu, Anhui Province. The project site consists of large thickness of peaty soil soils. Factors that affecting the stability of the gravity retaining walls are evaluated and the optimized dimensions of the gravity retaining wall supporting structure are obtained. It is observed that the gravity retaining wall supporting structure requires a minimum thickness as well as a minimum embedment depth.

Key words: Soft Soils, Deep Excavations, Gravity Retaining Walls, Optimization Design