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Design of Deep Mixing for Support of Levees and Floodwalls
The deep mixing method increases the strength and decreases the compressibility of soft ground, and thereby improves stability and reduces settlement of embankments and levees. Continuous shear panels oriented perpendicular to the levee or floodwall centerline are more efficient for stability than isolated columns because shear panels are not subject to the same type of bending failure that isolated columns can experience. Even when continuous shear panels are used, stability analyses must consider multiple modes of failure, such as composite shearing, rotation of the deep-mixed zone, shearing on vertical planes along column overlaps, extrusion between shear panels, crushing of the deep-mixed ground at the toe of the deep-mixed zone, and global instability. Furthermore, the strength of deep mixed ground is more variable than the strength of naturally occurring clay deposits. Multiple failure modes and high strength variability must be considered to develop economical and reliable designs of deep-mixed support systems for levees and floodwalls. This paper presents three examples of flood protection facilities in Louisiana for which the deep mixing method was applied after Hurricane Katrina. In addition, simplified analysis methods for stability and settlement, as well as consideration of other design and construction issues, are discussed in the context of a consistent overall design approach.
Design of Deep Mixing for Support of Levees and Floodwalls
The deep mixing method increases the strength and decreases the compressibility of soft ground, and thereby improves stability and reduces settlement of embankments and levees. Continuous shear panels oriented perpendicular to the levee or floodwall centerline are more efficient for stability than isolated columns because shear panels are not subject to the same type of bending failure that isolated columns can experience. Even when continuous shear panels are used, stability analyses must consider multiple modes of failure, such as composite shearing, rotation of the deep-mixed zone, shearing on vertical planes along column overlaps, extrusion between shear panels, crushing of the deep-mixed ground at the toe of the deep-mixed zone, and global instability. Furthermore, the strength of deep mixed ground is more variable than the strength of naturally occurring clay deposits. Multiple failure modes and high strength variability must be considered to develop economical and reliable designs of deep-mixed support systems for levees and floodwalls. This paper presents three examples of flood protection facilities in Louisiana for which the deep mixing method was applied after Hurricane Katrina. In addition, simplified analysis methods for stability and settlement, as well as consideration of other design and construction issues, are discussed in the context of a consistent overall design approach.
Design of Deep Mixing for Support of Levees and Floodwalls
Filz, George (author) / Adams, Tiffany (author) / Navin, Michael (author) / Templeton, A. E. (author)
Proceedings of the Fourth International Conference on Grouting and Deep Mixing ; 2012 ; New Orleans, Louisiana, United States
Grouting and Deep Mixing 2012 ; 89-133
2012-08-17
Conference paper
Electronic Resource
English
Grouting , Highways and roads , Soil mixing , Chemical grouting , Levees and dikes , Anchors , Cement , Cutoffs , Piles , Mixing , Embankments , Foundations , Hydraulic structures
Design of Deep Mixing for Support of Levees and Floodwalls
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