en.Wedoany.com Reported - Transport for New South Wales recently briefed over 20 engineering experts from Australia and overseas to restore road connections on the Great Western Highway at Victoria Pass. Matt Fuller, Deputy Secretary of Transport for NSW, said the event received constructive feedback from the industry. By sharing results from on-site investigations and early assessments, it helped experts identify the fastest and safest expressway restoration plan.

Since detection of accelerated cracking and increased displacement at Mitchell's Causeway, Transport for NSW has conducted drilling, coring, survey piling, seismic testing, and installed extensive expressway monitoring equipment. Investigations show that the bedrock beneath the westbound expressway lanes is 2 to 4 meters lower than that beneath the eastbound lanes, but the lower bedrock layer is solid. The expressway causeway fill material is varied, mainly composed of sand, containing voids and boulders. Displacement mainly affects the western retaining wall, and displacement within the causeway has persisted since traffic closure. Between the closure of the eastbound expressway lanes on March 5 and the full closure of the expressway causeway on March 8, multiple full-depth cracks quickly appeared in the asphalt.

Fuller stated that all expressway restoration options must restore at least the same number of expressway lanes and load capacity as before the closure, with delivery schedule being a key consideration. Experts are required to submit initial expressway plans and confirm delivery capacity by May 1. Transport for NSW plans to sign expressway contracts as soon as possible and advance expressway restoration options in the coming weeks. On-site monitoring and expressway safety remain top priorities. No final expressway plan will be selected at the briefing, and industry recommendations will inform subsequent steps.

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