Publication Abstract

Proceedings of the Deep Mixing 2015 Conference, (DFI)

Deep Mixing for Levee Repair at Hurricane Protection Project, P-17A, Louisiana, USA
Rakshya Shrestha, JAFEC USA Inc., United States; Ralph Griffin, JAFEC USA Inc., United States; Peter Cali, Sea Level Engineering, United States; Sushil Kafle, JAFEC USA Inc., United States; Motoji Watanabe, JAFEC USA Inc., United States; David Yang, JAFEC USA Inc., United States

As a part of the ‘US Army Corps of Engineers - New Orleans to Venice, Louisiana Hurricane Protection Project’, deep mixing ground improvement was designed to reinforce the soft ground for the emergency repair of a 7297-foot (2,224 m) long section of the Mississippi River West Bank levee in Buras Levee District under the contract ‘Emergency Levee Repairs – Contract P-17A, Plaquemines Parish, Louisiana’. The ground improvement utilizes a series of soil-cement panels oriented in the transverse direction of the levee. Each soil-cement panel consists of overlapped columns installed by the deep mixing method (DMM). DMM is performed from the existing top of levee and extended to competent stratum at depths varying from 26 feet (7.9 m) to 47 feet (14.3 m) below the working platform. The main purpose of the DMM panels is to provide shear resistance to the levee against lateral loads at high flood water condition. The DMM panels support the additional vertical load created by the increased height of the levee for hurricane protection and control the long-term settlement of the remediated levee, which might otherwise occur due to the compression of soft foundation soils. The total amount of DMM treatment is approximately 54,000 cubic yards (41,500 cubic meters). This paper reviews the project background, subsurface soil conditions and presents the design, construction and quality control of the deep mixing work for this levee repair project.

 article #2047; publication #1013 (DM-2015)