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Today population increase leads to an increased demand for reliable infrastructure. One of the challenges in deep excavation project is high level water table and deformation control of adjacent sensitive structures. The diaphragm wall technique (DW) is one of the alternatives that proposed for this condition. Development of Imam Hossein Shrine project has been constructed in Karbala, Iraq. In this paper, the performance of a 40 meter deep multi-propped excavation in medium to very dense sand and clay layers is studied. The vertical sidewalls of the excavation were supported by cast-in-place fully reinforced concrete diaphragm walls. In this project, the level of underground water table is high, so hydrolic uplift pressure at bottom of excavation is a problem, which two approaches were proposed. Scenario I was utilized the short external diaphragm wall and tension pile and scenario II was using the deep external diaphragm wall. Based on our results the second method has the benefits such as less cost and construction time as method I. To evaluation the performance of these methods a finite difference numerical simulation was developed by FLAC2D code.

Uplift Pressure Resistant Approach in Diaphragm Wall Excavation-case Study: Imam Hossein Holy Shrine Development -Karbala- Iraq