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 risks at sites with a legacy of coal mining. In most instances, an initial desk-based assessment will be undertaken to establish whether any significant risks apply. If the possibility of significant risk cannot be discounted on the basis of desk-based research alone, then fieldwork would normally be undertaken to investigate features such as old mine entries and underground workings. In situations where the fieldwork establishes that a significant risk exisits, we assist with the design, specification and field supervision of stabilisation work.
A typical workflow is illustrated by a small housing development in Swansea, South Wales, where our desk-based research and subsequent boreholes 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 we prepared for this project are presented below.