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Abstract: Underground stations of Jakarta MRT phase 1 project were constructed by top-down cut-and-cover method in alluvial clay and diluvial soil strata. Diaphragm walls for underground stations have a thickness of 1.0 m, and a depth of 21 – 30 m. The monitoring of lateral deflection of D-walls was conducted at all stations for controlling the safety of construction sites and the impact to surrounding...