Publication Abstract

Proceedings of the Deep Mixing 2015 Conference, (DFI)

Deep Mixing Field Trials for Land Remediation: Some 3-Year Results from the SMiRT Project
Abir Al-Tabbaa, University of Cambridge, United Kingdom; Fei Jin, University of Cambridge, United Kingdom; David O'Connor, University of Cambridge, United Kingdom; Ziyad Abunada, University of Cambridge, United Kingdom

In-situ remediation of contaminated land with deep mixing can enable a multi-technique remedial strategy on the same site combining low permeability barriers, permeable reactive barriers, stabilisation/ solidification treatments as well as ground improvement, delivering significant advantages over alternative strategies. This was the core objective of Project SMiRT (Soil Mix Remediation Technology) which involved the execution of the largest research field trials in the UK to date to provide field validation for this technique. Around 800m3 of soil were treated on a contaminated site in Yorkshire in May 2011 with 6 different treatments, testing ~40 binder compositions and 10 different installation methodologies. Field monitoring, testing and coring activities at the site took place within the first 2 months after treatment and then again at 34 months after treatment. This paper presents an overview of the field activities to date and some 3-year results and assessment of a subset of the treated soil sections. Some good correlations are seen together with some clear differences between treatments. There is generally an observed consistency with depth, with the mixing effectiveness having a more profound effect than the binder composition or content, within the tested materials and ranges. These field trial activities are currently being used in the development of the full-scale commercial remedial strategy for the site.

 article #2074; publication #1013 (DM-2015)