Publication Abstract




Proceedings of the Deep Mixing 2015 Conference, (DFI)

Deep Mixing Core Data from LPV 111
George Filz, Ph.D., P.E., Virginia Tech, United States; Donald Bruce, Ph.D., D.GE., C.Eng., Geosystems, L.P., United States; Wesley Schmutzler, TREVIICOS, United States; Mitsuo Nozu, Fudo Tetra Corporation, Japan; Alex Reeb, Virginia Tech, United States

One million seven-hundred thousand cubic yards of deep mixing were installed to support an elevation raise of an earthen levee known as LPV 111, which is located in east New Orleans. The deep mixing was done by two contractors using somewhat different technologies, but producing elements of the same size. As part of the quality control and quality assurance program, 507 deep-mixed elements were cored and 5,082 specimens were strength tested in unconfined compression. This paper presents data from the coring and testing program. Very high percentages of the core run lengths were recovered, except during one period for one mixing technology. The coring methods are described, and reasons for the isolated episode of low recovery are discussed. The strength data show that the specification acceptance criteria were satisfied. Statistical parameters of the strength data are provided, and trends between strength and the following factors are discussed: depth, soil type, binder factor, and project-specific experience. Photographs of longitudinal cuts of core specimens are presented. Important lessons learned from this unusually large project are described.


 article #2076; publication #1013 (DM-2015)