Tunnelling under major roads and MRT lines: North-South Corridor construction enters 'most challenging phase'
From rock blasting in Thomson to tunnelling a metre beneath the North-South Line, engineers describe the obstacles slowing down one of Singapore’s largest transport projects.
Construction of Singapore's North-South Corridor (NSC) has entered its most technically challenging phase, as engineers face obstacles while building the structure above and below operational MRT tunnels. Completed in phases since 2018, the NSC spans over 20km and consists of an 8.8km elevated viaduct and a 12.3km underground tunnel section.
Major obstacles include differing ground conditions, hard rock formations, and varying rock profiles. Ground conditions have led to changes in construction methods, requiring additional rock removal, ground stabilization, or alterations to construction techniques. The project's 8.8km viaduct is expected to open in 2027, presenting significant logistical challenges due to its size and complexity.
Major segment installation is carried out during off-peak hours to minimize disruption to motorists and bus services. At some locations, viaduct construction crosses live roads and major junctions, further limiting the time and space available for construction. Additionally, the northbound tunnel below the North-South Line has encountered fractured rock and groundwater inflows, requiring a controlled mining method and extensive rock removal, grouting, and monitoring.
The NSC runs through various locations, including Sembawang, Yishun, Ang Mo Kio, Toa Payoh, Novena, and Rochor, and aims to improve connectivity while relieving traffic along Singapore's north-south transport axis.
Written by urgent.news from CNA - Singapore's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
Also reported by 1 other outlet
- North-South Corridor construction enters its 'most challenging phase': LTA channelnewsasia.com
