Supporting MWH over 5 weeks in Tideswell, Derbyshire
CAN designed and delivered slope stabilisation works, creating a safe, stable excavation for new treatment tanks. The solution was adapted to changing ground conditions, supporting both the construction phase and the site’s long-term stability.
As part of upgrade and enhancement works at Tideswell wastewater treatment works, new treatment tanks were to be installed, requiring earthworks to cut back and steepen the adjacent hillside to create a new level formation for the tanks.
CAN were appointed to design and build a slope stabilisation solution to stabilise this newly cut face, both to protect workers installing new treatment tanks below the newly cut face and provide permanent stability to the slope behind.
With mixed soil and rock ground conditions, a bespoke design solution was provided using soil nails and rock bolts of varying lengths and load capacities, in conjunction with a hard facing system. With limited information on ground conditions available, an observational approach was employed, adjusting the design on site to actual ground conditions encountered as the face was sequentially cut.
Soil nails were installed using 360-degree mounted drill rigs working on benches as the face was cut, with a structural facing of reinforced wet-sprayed concrete applied to support the unstable rock encountered on the face. A geo-composite facing system comprising steel rock netting and erosion matting was installed to stabilise the soil slope areas and promote vegetation regrowth further up the face.
