Effects of construction of underground mass rapid transit on nearby piled-structures

Abstract

The increase demand for underground systems in urban cities particularly for mass transportation has led to many tunnels being constructed in close proximity to buildings and structures. Two case histories on the construction of the Mass Rapid Transit (MRT) tunnels adjacent to structures supported on pile foundation are presented. The first case history is from the North-East Line Contract 704 where an existing piled viaduct bridge was located in between the construction of twin tunnels and aligned in parallel direction. The second case history is from the Circle Line Contract 825 where two vertically stacked tunnels were constructed under an existing piled-building. In-pile instrumentation, field measurements and 3D finite element simulation of the construction showed the response of piled-structures to the tunnel advancement for two different tunnel-pile configurations.