Publication Abstract

Proceedings of the Deep Mixing 2015 Conference, (DFI)

Construction Operations and Challenges of a Cutter Soil Mixing Project in Kitimat British Columbia
Keith MacKay, Golder Construction, Canada; Rachel Cleary, Golder Construction, Canada; David Siddle, Golder Construction, Canada; Donald Bruce, Ph.D., D.GE., C.Eng., Geosystems, L.P., United States; G. A. Chapman, Golder Associates, Australia; George Filz, Ph.D., P.E., Virginia Tech, United States

Deep soil mixing at a proposed industrial facility near Kitimat, British Columbia, utilizing Cutter Soil Mixing (CSM) was completed by Golder Construction Inc. under the framework of a Design Build contract. Golder Construction Inc. and Golder Associates Ltd. in conjunction with a peer review panel worked to conduct a phased site investigation, bench-scale soil mixing trials, detailed design, and field soil-mixing trials, followed by production CSM works. The works consisted of 1645 interconnected soil cement panels generally forming a pattern of shear walls spaced 3.4 meters center to center in order to support reinforced earth retaining walls up to 20 meters in height which would retain the proposed site fill. The aims of this paper are to describe the logistics, equipment, materials, and construction methodologies and strategies adopted during the design and construction of this project, and to present correlations obtained between the site geology and the performance and productivity of the CSM machines. The surface geology surrounding the site is characterized by dramatic topography and geomorphological variability; a similar variability in conditions was found to be the case below ground. These variable ground conditions provided challenges, such as selecting an appropriate CSM binder content and construction method to consistently achieve the target strength specifications, as well as estimating the construction time and equipment maintenance requirements for the completion of each panel. The main works were completed using three Bauer CSM rigs: an RG25S, an RG19T, and a BG36, each mounted with a BCM10 CSM attachment, to construct over 25,000 lineal meters of panel with the majority of the construction occurring on a 24 hour per day, 7 day per week schedule. Monitoring equipment onboard the CSM rigs measured and recorded the CSM cutting pressures, wheel rotation speeds, penetration rate, binder injection rate, and other relevant cutting and soil-mixing parameters. This data was used to develop some of the correlations presented in the paper.

 article #2066; publication #1013 (DM-2015)