ABSTRACT
To estimate the ground settlement caused by TBM excavations for the Jakarta MRT Phase 2A, three sections of 2D-FE analyses were carried out. The estimated maximum ground settlements for the ground loss ratio of 1.0% are between 16.58 – 20.31 mm. The estimated settlements and maximum differential settlements of the nearby heritage buildings, located 5.8 – 8.6 m from the TBM alignment, are in the ranges of 9.23 – 12.15 mm and 1/1197 – 1/835, respectively. The impacts to heritage buildings shall be reduced by carefully designing TBMs and controlling the TBM’s face and tail void pressures, e.g. by causing the ground loss ratio less than 1.0%. It can be concluded that the building settlements will be less than the allowable values when the ground loss ratio is not greater than 0.75%.
