Completion of North-South Corridor set back 2 years, LTA notes 'significant' construction challenges陆路交通管理局指出，南北走廊工程竣工时间推迟两年，面临“重大”施工挑战
The completion of North-South Corridor (NSC) has been pushed back by about two years as it faces construction challenges, the Land Transport Authority (LTA) said in an update on Thursday (Sept 17).The 21.5km corridor is set to enhance connectivity between the northern parts of Singapore and the city, connecting towns like Sembawang, Yishun, Ang Mo Kio, Toa Payoh, Novena and...
The completion of North-South Corridor (NSC) has been pushed back by about two years as it faces construction challenges, the Land Transport Authority (LTA) said in an update on Thursday (Sept 17) .
The 21.5km corridor is set to enhance connectivity between the northern parts of Singapore and the city, connecting towns like Sembawang, Yishun, Ang Mo Kio, Toa Payoh, Novena and Rochor to the south.
It comprises an 8.8km viaduct and a 12.3km tunnel section and is expected to help relieve congestion along expressways and major arterial roads.
More than 90 per cent of the viaduct and tunnel foundation work have been completed as at August 2026, said LTA, adding that construction has currently progressed to above-ground structures such as installing columns, crossheads and viaduct segments.
The NSC was supposed to be completed in phases with the viaduct completed in 2027 and the tunnel in 2029.
Now, the viaduct from Admiralty Road West to Lentor Avenue and the tunnel from Lentor Avenue to East Coast Parkway are expected to open in phases from 2029 and 2031 respectively, LTA said.
Fractured rock, groundwater inflows
The construction timeline had to be changed due to several site-specific challenges.
LTA noted that significant foundation work had to be done along Gambas Avenue and Woodlands Avenue 8 due to challenging ground conditions.
For instance, some of the piles had to be driven deeper than originally planned due to the presence of fractured rock.
Also, the presence of fractured rock and groundwater inflows underneath the live North-South Line tunnel required a more time-intensive mining method to excavate at Novena.
"This is one of the most technically demanding sections of the project, where the NSC tunnel passes both above and below the operational NSL, with clearance as close as one meter," LTA said of the construction in Novena.
Extensive controlled rock blasting, additional rock removal and ground stabilisation work had to be done before excavation could proceed safely at Thomson.
As the viaduct work is highly sequential, delays to the foundation work have affected subsequent activities, LTA said, explaining that installation of crossheads and segments can only proceed after the foundation is completed.
Progressive reinstatement of roads
Commuters and motorists travelling along the corridor can expect travel conditions to improve progressively as major structural works are completed, said LTA's NSC deputy group director, Ang Pui Boon.
Speaking to the media on Tuesday, he said that more construction activities will move underground, easing disruption on surrounding roads from 2027.
From 2028, completed stretches will be progressively reinstated with roads, footpaths, and other public areas reinstated for public use, he added.
Ang said: "Our priority remains to complete the project safely while progressively improving conditions for motorists, residents, and businesses along the corridor."
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陆路交通管理局（LTA）周四（9月17日）发布最新消息称，由于面临施工挑战，南北走廊（NSC）的竣工时间已被推迟约两年。
这条 21.5 公里的走廊将加强新加坡北部地区与市区之间的连通性，连接南部的三巴旺、义顺、宏茂桥、大巴窑、诺维娜和罗卓等城镇。
该项目包括一段 8.8 公里的高架桥和一段 12.3 公里的隧道，预计将有助于缓解高速公路和主要干道的交通拥堵。
陆路交通管理局表示，截至2026年8月，高架桥和隧道基础工程已完成90%以上，目前施工已进入地面结构阶段，例如安装桥墩、横梁和高架桥段。
国家安全走廊计划分阶段完工，高架桥于 2027 年完工，隧道于 2029 年完工。
陆路交通管理局表示，从海军部西路到伦多大道的高架桥和从伦多大道到东海岸公园大道的隧道预计将分别从 2029 年和 2031 年分阶段开放。
裂隙岩层，地下水流入
由于场地存在一些特殊挑战，施工时间表不得不做出调整。
陆路交通管理局指出，由于地质条件复杂，甘巴斯大道和兀兰8道沿线必须进行大量的地基工程。
例如，由于存在破碎的岩石，一些桩不得不比原计划打得更深。
此外，由于南北线隧道下方存在破碎的岩石和地下水流入，诺维娜隧道的开挖需要更耗时的采矿方法。
“这是该项目技术难度最高的部分之一，NSC隧道从运营中的NSL上方和下方穿过，净空距离最近处只有一米，”陆路交通管理局在谈到诺维娜的施工时表示。
在汤姆逊矿区，必须进行大规模的控制性岩石爆破、额外的岩石清除和地面稳定工作，才能安全地进行挖掘工作。
陆路交通管理局表示，由于高架桥工程具有很强的顺序性，基础工程的延误影响了后续活动，并解释说，只有在基础工程完成后才能进行横梁和管片的安装。
逐步恢复道路
陆路交通管理局国家安全委员会副主任洪培文表示，随着主要结构工程的完成，沿该走廊通勤者和驾车者的出行条件将逐步改善。
周二，他在接受媒体采访时表示，从 2027 年起，更多的建筑活动将转移到地下进行，从而减轻对周边道路的干扰。
他补充说，从 2028 年开始，已完工的路段将逐步恢复原貌，道路、人行道和其他公共区域将重新开放供公众使用。
Ang表示：“我们的首要任务仍然是在确保安全的前提下完成该项目，同时逐步改善沿线驾车者、居民和企业的出行条件。”
khooyihang@asiaone.com
dana.leong@asiaone.com