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  Back Analysis of Monitoring Data for Underground Stations of Jakarta MRT Project

  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 area. The measured maximum lateral deflection of D-wall is in the range of 4.1 - 10 mm, much less than the pre-analysis conducted by finite element method. The back analysis by elasto-plastic beam-spring model using revised soil parameters was carried out for describing monitoring results. The results from back analysis are much closer to monitoring results which confirmed that the stiffness and strength of soil are higher that the original values.

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