Peats in the British Isles: their characteristics and engineering considerations

Peat, as an organic soil, presents significant geotechnical challenges in geotechnical engineering. This paper reviews the geotechnical aspects of common peats found in the British Isles and highlights their distinct properties and behaviours that influence the stability of geotechnical structures. Peat exhibits unique characteristics such as high porosity, compressibility and clay content, along with substantial permeability dependence and fibrous composition. These properties contribute to settlements, failures and creep phenomena observed in peat-based ground conditions The geotechnical behaviour of peat is influenced by its low shear strength, anisotropy, spatial variability and time-dependent deformability. These factors necessitate comprehensive understanding and analysis to accurately assess the stability and long-term performance of structures built on peat deposits. Published data on characteristics of peats from the British Isles were re-analysed and compared with data from other parts of the world. The authors propose correlation equations for British Isles peats that can be used by practitioners. A brief introduction to geophysical investigation methods and stabilisation options for peat soils emphasises key concepts and general applications. While detailed technical specifications and case studies are not extensively covered, the summary aims to guide practitioners towards appropriate strategies and references for further exploration.