The following case studies provide a brief summary of the types of work that we are typically engaged in.
Working thorought the South Wales and Bristol Coalfields, we have extensive experience in the assessment and mitigation of hazards and risks associated with coal mining legacy. In most instances, an initial desk-based risk assessment will be undertaken. If this cannot discount the possibility of significant risk then intrusive exploratory work would normally be required to examine features such as old mine entries and underground workings. In situations where significant risk is confirmed we assist with the design, specification and field supervision of remediation/stabilisation work.
A typical workflow is illustrated by a small housing development in Swansea, South Wales, where our desk-based research and subsequent borehole investigation established the presence of old coal mine workings at shallow depth. The site was made safe for development by filling the workings with a PFA:OPC grout via a grid of grout injection borheoles. Selected figures from the reports prepared for this project are presented below.
In 2014 we were appointed by Kelston Toll Road Limited who required specialist geotechnical assistance to secure retrospective planning permission for a privately operated temporay toll road near Kelston, Bath. The toll road was constructed by a local businessman following a landslide that closed the A431 linking Bath and Bristol. Routed through fields above the road closure, the toll road was approximately 365m long and provided a popular alternative to the ten mile official diversion established by the local authority whilst stabilisation works on the A431 were completed.