Hiway GeoStabilization was awarded the contract for installation of one (1) 25m long, 3m high Geobrugg SL-150 Shallow Landslide Barrier. The system was installed to protect residential properties following a storm-induced slope failure that swept one small dwelling 50m downslope while destroying it and forcing a small car 4m up into the branches of a tree. The barrier system spanned the width of the fresh gully feature and was designed to contain the volume of potential material remaining at the head of the gully. In addition to the barrier’s construction, Geobrugg’s TECCO® mesh was also installed to stabilize slopes along the ravine. The design utilised our proprietary low-carbon, low-phosphorous T40 steel hollow bar anchors; allowing wider anchor spacing than achievable with standard 25mm or 32mm bar.
The TECCO® system was installed using full rope access, with HGS rock remediation technicians operating to international IRATA safety standards. Its anchors were drilled using pneumatic wagon rigs, while the barrier’s anchors were installed a SuperNailer™ drill. The solution allowed local residents to return to their properties and sleep carefree during future storm events.
The project involved the design and build of 3 retaining walls to remediate slips, and increase the road width, Hiway Geotechnical’s design involved installation of micro piles, construction of a reinforced concrete footing.