MRT services at 7 CCL stations including Dhoby Ghaut to be affected by tunnel strengthening works - The Straits Times

SINGAPORE - Passengers using the Circle Line (CCL) will face delays of up to 30 minutes from June 11 to July 20, because of maintenance works that will be carried out on a stretch of the tunnel built on reclaimed land that “has been subject to greater pressure”.

Announcing this on Wednesday, the Land Transport Authority (LTA) said the works will affect services at seven stations – Dhoby Ghaut, Bras Basah, Esplanade, Promenade, Nicoll Highway, Marina Bay and Bayfront.

Trains will operate from only one platform from 9pm on most days during the six-week period, with two shuttle train services plying the affected stations.

LTA said routine inspections had found that a stretch of the CCL tunnel between Promenade and Nicoll Highway stations “has been subject to greater pressure”.

“LTA has assessed that this poses no safety risks to CCL train operations,” the authority said, adding that it will carry out precautionary maintenance and strengthening works, including installing steel supports to the tunnel rings “to ensure the long-term integrity of the tunnel”.

Responding to queries, an LTA spokesman said instruments set up to monitor this stretch of the CCL tunnel round the clock had picked up “localised incidence of higher-than-projected ground pressure”.

“Residual ground movement is common, and some settlement is still expected for some time after construction. This is why we monitor tunnel stretches located in reclaimed land consisting of marine clay, such as this CCL tunnel stretch, especially closely,” he said.

“At present, we have not detected a similar issue in other areas.”

The LTA spokesman also said all the tunnels are made with reinforced concrete segments, and their design took into account ground conditions.

The steel plates that will be added to the tunnel rings are an additional strengthening measure, he added.

To allow these works to be carried out, trains will ply the seven stations as shuttle services back and forth from 9pm till the end of operating hours for much of the period from June 11 to July 20.

Trains will run normally on June 16 to 18, 24, 28 and 29; and on July 1, 2, 7, 8, and 14 to 16.

There will be two shuttle services – one between Dhoby Ghaut and Promenade stations that will run at 15-minute intervals, and another between Marina Bay and Stadium stations, where trains will arrive every 20 minutes.

“This will result in longer headways, and commuters will experience additional travel times of up to 30 minutes,” LTA said.

The LTA spokesman said it had considered other approaches, including opening the line late or carrying out works only during normal engineering hours after service ends, over a longer period.

The partial closure “strikes the best balance between minimising disruption to passengers and completing the works within a reasonable period of time”, he said.

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2023-05-24 08:17:08Z
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