CIRIA's Research Project 441 "Field trial and demonstration site for bio-engineering", undertaken over the period 1991-1995 and Research Project 536 "Bioengineering: M20 - medium-term monitoring", from 1995 to 1998, followed from CIRIA's earlier publication, B10 The use of vegetation in civil engineering. The project was conceived as a live trial, where the effects of vegetation on the stability of slopes could be demonstrated for the benefit of the engineering community and its clients. The research was not able to continue at Longham Wood as the site was taken over by the route of the Channel Tunnel Rail Link in mid-1998. This report supersedes CIRIA Special Publication 128, "Bioengineering: A Field Trial", and covers the following aspects of the project: literature review to establish the required geotechnical attributes and vegetation types; setting up of the site, on a reprofiled cutting in Gault Clay, adjacent to the M20 in Kent; the instrumentation installed to monitor the hydrological characteristics of the site; and the tests carried out to monitor the the geotechnical and vegetation characteristics.The open publication is supported by a large volume of numerical data, collected during the monitoring periods.
This data is presented in a separate Data Appendix, which is separately available from CIRIA on CD-ROM.