Results
Slope successfully remediated to a safer ARL rating (ARL 4 or better).
Project completed safely within the constraints of night-time access.
Significant improvement in program delivery and reduced traffic management costs.
Enhanced long-term safety for motorists along a critical section of the motorway.
Project
Solution
Night-time works to reduce disruption to traffic.
Scaling, block removal, and devegetation to remove immediate risks.
Installation of rock bolts from 1m to 6m depth along the 320m cutting.
Use of Geovert custom-built High Reach Drill (HRD) to install bolts 32m above the road.
Hand drilling to stabilise features at the 50m crest.
Application of shotcrete and mesh slope treatments using EWPs and rope access.
Project
Challenges
High traffic volumes (150,000 vehicles per day) requiring careful traffic management.
Live motorway environment where public safety and minimal disruption were critical.
Steep 50m slope with sandstone features requiring removal and stabilisation.
Delivery program constrained by night-only access and traffic control measures.
Project
Overview
Remediation works were undertaken on a 320m long, 50m high sandstone slope adjacent to the northbound carriageway of the M1 Pacific Motorway near Brooklyn, NSW. Classified as ARL 1, the slope posed the highest rockfall risk rating, requiring stabilisation to reduce risk to ARL 4 or better.
With approximately 150,000 vehicles passing daily, works were planned predominantly at night to minimise traffic disruption, combining scaling, bolting, mesh, and shotcrete treatments to secure the cutting and reduce the risk of failure.