Transportation + infrastructure
Moresby Hall A595 Roadway Embankment Repair Project
Material Selection and Design Criteria Given the height of the embankments, the project required a solution that could minimize settlement and mitigate the risk of overloading the newly installed drainage infrastructure below. A lightweight yet strong system that could also support a vegetated finish was essential. With these requirements in mind, the GEOWEB® Earth Retention System emerged as a viable choice due to its capability to withstand differential settlement without compromising structural integrity. Following discussions with stakeholders and the technical team, it was decided that Presto Geosystems' GEOWEB® Retaining Wall System, infilled with Leca® Lightweight Aggregate (LWA), would be employed to address the issues with the failing embankments. As part of this decision-making process, Presto Geosystems’ design engineering team conducted a complimentary project evaluation to provide further design assistance.
For several years, the United Kingdom’s National Highways and local authorities have been monitoring areas of ground movement within the embankments supporting the A595 roadway near Moresby Hall in Cumbria. To address the deteriorating ground concerns, the National Highways developed a £16 million (approximately $20 million USD) improvement project. The goal was to rebuild the roadway embankments and integrate a new drainage system, thereby facilitating long-term improvements and reducing maintenance needs for the A595. Project Planning and Initial Phases In 2022, Amey Highways (the project designer) and AE Yates Civil Engineering (the project contractor) collaborated with National Highways to begin planning an improvement project aimed at rebuilding the A595 embankments and drainage systems near Moresby Hall. The team worked closely with technical experts and material supplier, Greenfix . Two site enhancement locations were established, one on each side of the A595 roadway. Phase One: A micro-tunnelling technique was used to minimize disruption while two tunnels were installed under the embankment as part of the work to upgrade the drainage system along the A595. Phase Two: Improvements to the A595 included restructuring embankments on both sides of the roadway. These embankments had an average length of approximately 140 meters (460 ft) long and up to 10 meters (33 ft) high.
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csengineermag.com
NOVEMBER 2023
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