Soil Mixing
This committee of designers, contractors, researchers, equipment suppliers and owners are involved in the support, use, and understanding and application of soil mixing technology through education, practical guidance, and discussion.
Committee Chair
David Miller, P.E.
Forgen, LLC
David Miller, P.E., executive director of Geotechnical Operations for Forgen, has 36 years specializing in ground improvement techniques, especially deep soil mixing (DSM). He has completed projects in the U.S., Canada, Australia and New Zealand involving jet grouting and deep and shallow soil mixing. He worked on the first multi-auger project in the U.S. at the Jackson Lake Dam, one of the first large-diameter (12 ft) soil mixing applications. He has handled fast-track soil mixing on levee systems for emergency repairs from Hurricane Katrina; multiple cutoff walls up to 135-ft deep using DSM on levees; DSM for seal slab and stabilization for a railroad grade separation; treatment for the stabilization of dams for liquefaction prevention; wharf repair following the 2011 earthquake in Christchurch, New Zealand; and excavation support and groundwater cutoff for major high-rise construction in San Francisco. He served as the project director on three Task Orders for the USACE totaling16 miles of soil mixed cutoff wall. He actively participated in finalizing DFI’s Guidelines for Soil Mixing. He earned his bachelor’s degree in architectural engineering from the University of Texas at Austin and is a registered professional engineer in Texas. He has published several papers on the use, specification and quality of soil mixing along with case studies.
S3: Slopes Slides and Stabilization 2021
- Keynote lectures on deep mixing*
- Ross Boulanger (UC Davis)
- Rob Jameson (Malcolm Drilling)
- Deep Mixing 2021 – On Demand proceedings available
- Deep Mixing 2021 – keynote article series in Deep Foundations magazine
*Available to S3 2021 attendees through your profile.
Initiatives
Committee Research
Committee endorsed research projects that explore soil mixing topics.
Beneficial Reuse of Spoils Task Force
Discussing practices and special provisions that encourage the appropriate use of deep mixed spoils on site.
In progress.
Fundamentals
DFI Soil Mixing Guidelines – overview of the state of practice of Deep Mixing Methods (DMM) in North America, including a guide specification for deep mixing work.
FHWA Design Manual: Deep Mixing for Embankment and Foundation Support – background on deep mixing for U.S. transportation projects and information on design and construction aspects.