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Slope failures related to pore-water dissipation, stress relaxation and desiccation cracks are major problems occurring in the UK ageing road network. The remediation works are known to cause congestion and delays that, in turn, cause financial loss and discomfort to users. Our industry partner, Mouchel, believe that it is possible to reduce the number of slope failures, maintenance costs and bring large social benefits by using soil reinforcement to reinstate failed slopes. The use of fibre reinforced soils has been a topic of research for many years, however not many applications have been seen so far. Fibres have the potential to reduce environmental impact by improving soil properties and allowing the use of local available soils. In order to increase its use, it is important to understand how the inclusion of fibres can improve soil properties, particularly in heavily overconsolidated soils, where the compacted composite has “peds” carrying properties of the intact soil. To study the soil improvement, a new compaction methodology was developed, mimicking the behaviour of the site compacted composite. Series of drained and undrained triaxial tests were performed in reinforced and unreinforced laboratory compacted samples, as well site compacted samples. In order to better understand the effect of structure, reconstituted samples were also tested. The results show that the reinforced samples, tested below a critical confining pressure, have higher strength than the unreinforced samples, whilst above this pressure the strength reduces. The data revealed that the reinforced samples appear to have a unique critical state line, whilst the unreinforced …