Proceedings of the Deep Mixing 2015 Conference, (DFI)
Material Properties for Analysis of Deep Mixing Support Systems
George Filz, Ph.D., P.E., Virginia Tech, United States; Alex Reeb, Virginia Tech, United States; Alex Grenoble, HDR Inc., United States; Farzad Abedzadeh, HDR Inc., United States
This paper summarizes available information on the characteristics and properties of deep-mixed soilcement produced by the wet method. The topics covered in this paper include: unit weight, unconfined compressive strength, strength variability for field mixed materials, influence of curing time, influence of consolidation pressure, Young’s modulus, differences in strength and stiffness between small and large samples, creep deformations, Poisson’s ratio, and tensile strength. In addition, this paper discusses the development of design considerations and recommended property values for a project that uses soilcement to protect an existing dam penstock from loads applied by an overlying stability berm. Some of the key recommendations for the deep-mixed soil-cement to be used in this project are that (1) a curved strength envelope that includes tensile strength can be used in the analysis, (2) the stress-strain and strength properties can be characterized using Duncan and Chang's (1970) hyperbolic model, and (3) a specification based on the median unconfined compressive strength value is appropriate.
|article #2039; publication #1013 (DM-2015)|