Abstract:
This paper explores the differences in post-treatment soilcrete properties, in particular strength and permeability, between various wet soil mixing technologies, including Deep Soil Mixing (DSM), Cutter Soil Mixing (CSM), & Trench Remixing Deep (TRD). Five unique project sites, including storage tank facilities, a large-scale residential development, and a landfill, provide a large dataset from which to build a robust comparative study that is relevant to many other wet soil mixing applications. Specific wet soil mixing applications from the five projects discussed include temporary & permanent support of excavation, a groundwater cutoff wall, foundation & settlement control for storage tank facilities, and a landfill barrier wall. Site specific conditions such as pre-treatment ground conditions, soil profile, depth of treatment, and groundwater variation are considered in the analysis. From each project, a thorough quality control program consisted of in situ & laboratory testing, including wet grab sampling, standard core sampling, wet core sampling, in-situ permeability tests. Cumulative distributions and other statistical measures of confined compressive strength & permeability test results are presented and compared in order to illustrate the advantages of each technology in different applications. The various wet soil mixing technologies presented in the paper have different advantages as shown through the analysis of variation in strength and permeability of post-treatment material; pairing each challenging application with the proper technology is the key to achieving a successful outcome in every project.