Maccaferri’s teamwork with project design engineers StefStocks and DRA Mineral Resources enabled the timely completion of this MacRes T and ParaWeb soil reinforcement Mining solution.
Maccaferri is involved with a myriad of projects, each of which has its specific needs. While most projects require collaboration with one contractor or designer, other projects need far more teamwork between Maccaferri and project design engineers.
Teamwork is synonymous with equal amounts of hard work and works ethic between all parties, one relying on the other. Maccaferri prides itself in taking a holistic approach to every project—i.e. not only by providing isolated solutions but also by interacting with the different suppliers, designers, and contractors in a highly professional and efficient manner.
A recent mining work in the Kalahari Basin, approximately 80km North-West of Kuruman, Northern Cape Province aptly exemplifies Maccaferri’s ability to both collaborate within a team of different parties and provide solutions that are tailored to meet the team’s needs.
In summary, the Assmang Manganese mine required a total of 4 receiving systems, approximately 7.5m high to accommodate tipper trucks, imposing up to 250kPa downward pressure onto the top slabs of the walls. To deliver a solution Maccaferri worked in conjunction with StefStocks and DRA Mineral Resources, the project design engineers.
Both StefStocks and DRA Mineral Resources were responsible for developing solutions for different areas of the project. The initial design featured a traditional cast in-situ concrete cantilever wall, yet due to an increase in construction time and a cost reduction, StefStocks approached Maccaferri for an alternate solution.
The region where this solution was required faced a severe environmental complication: the soil in the area was made up of materials with elastic properties; any retaining wall system had to accommodate these conditions without being damaged. Accordingly Maccaferri proposed the MacRes T system, with high strength ParaWeb geosynthetic reinforcement strips, a system offering strength with flexibility. Two separate systems were constructed, each consisting of two facing walls. DRA designed a 1m concrete slab spanning from one wall to the other for the trucks to drive onto, then tip through a grizzly onto a conveyor system below.
Numerous soil tests were performed to refine the design of the wall and enhance the environmental credentials of the solution. The results enabled the use of a blend of Manganese and Sand as structural backfill to the MacRES reinforced soil system. Furthermore, site won material was re-used, placed and compacted to improve the foundation
The many changes that occurred throughout the project called for extensive amounts of three-way collaboration between Maccaferri, StefStocks, and DRA Mineral Resources.
Finally, Maccaferri also provided on-site training to ensure that the construction crews had suitable knowledge to install the structure correctly. The fruits of a productive collaboration led to the successful completion of the project.
The four walls have a face area of 850 m² and were constructed in less than three months as per the client’s program in order to commission the works in December 2015. For more information, please contact us.