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 geohazards and associated 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 found 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.