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Excessive subsidence halts excavation on Hong Kong station

Joint venture contractors Leighton and China State Construction have been ordered to stop excavation work on Hong Kong’s Exhibition Centre Station on the Shatin to Central link over ground movement concerns.

exhibition station west construction site in february 2016

exhibition station west construction site in february 2016

Source: Exploringlife

Diaphragm wall construction for the station was undertaken in 2016

Hong Kong public transport operator MTR Corporation was ordered by the Highways Department to temporarily stop excavation work after settlement exceeded more than twice the acceptable levels in some areas.

Newly appointed MTR projects director Jacob Kam has said that work has stopped to allow records to be reviewed and no date has been set for excavation to resume. He added that the area is formed of reclaimed land and there are other infrastructure projects under construction in the area and that “settlement could be significant”.

This halt on excavation work follows on from an incident on the site in June where the contractor allowed the excavation to progress beyond the depth allowed before installing a final layer of temporary steel struts. MTR expressed “deep dismay” at the incident and the delays in reporting the error.

A report seen by GE on the latest issues shows some settlement within the site or next to it which is up to 232% of the acceptable limit. Ground movement has also affected structures near the site with settlement of 83mm at the former Wan Chair ferry pier and 37mm – which is 50% over the alarm level – at on a water pipe on Fleming Road.

The report states that ground movement at 16 locations reached alert levels and four sites exceed action levels, however, none of these locations are linked to buildings around the site. In total there are 707 monitoring points.

 

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