Abstract
In urban areas, properly designed deep excavation support systems are essential for any new underground construction adjacent to the existing buildings. Diaphragm walls are widely used in India as deep excavation support system to facilitate strut-free excavation as well as to limit the soil movement of surrounding areas due to excavation. In this paper, a ten-story new commercial development required a three-level basement excavation of 12.5 m (max.) from the existing ground level (EGL). Project site consists of mixed soil condition with silty clay of varying consistency followed by dense sand underlain by a weathered rock layer. A 600 mm thick rectangular D wall panel with temporary ground anchors was used to support deep excavation wherever sufficient setback is available. In the same site, one of the corners has a restricted setback which demanded 8 m cantilever wall with high structural rigidity. Hence, T-shaped diaphragm wall panels of 600 mm thick were adopted as a permanent cantilever wall. Numerical modeling of the retention system was analyzed using WALLAP and PLAXIS 2D software. The wall deflections were monitored through inclinometers. This paper reviews the performance of cantilever diaphragm wall and rectangular panel wall with single anchor for 8 m excavation depth. Cantilever T-shaped diaphragm wall proved to be effective and stable system, where tie back is not feasible.
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