Publication Abstract

Proceedings of the Deep Mixing 2015 Conference, (DFI)

Deep Dry Soil Mixing Performance and Quality Control Acceptance Criteria
Patrick K. Wong, PKW Geosolutions Pty Ltd., Australia; Richard B. Kelly, Coffey Geotechnics Pty Ltd., Australia

The variability in strength and compressibility of in situ deep soil mixing products can be greater than the variability of the natural soil. However, satisfactory performance can be achieved by careful construction and an appropriate QA/QC program. This paper presents a case study on the use of deep dry soil mixing columns to support several embankments over soft clay along a highway project. Post-construction settlement monitoring indicated that good performance is achieved where the acceptance criteria are met, except in an area with high organic content. Embankments with contrasting performance are compared to the quality control test results which comprised laboratory testing of core samples as well as in situ test results such as pull-out and push-in vanes and conventional cone penetration tests. Drawing on the performance results and quality control testing, discussions and guidelines are given on quality assurance acceptance criteria and construction control testing regime for future projects.

 article #2102; publication #1013 (DM-2015)