Application of Deep Mixing Method to a Challenging Bridge Construction Project: The Glen Road Interchange

This paper presents a case study of the application of the Deep Mixing Method (DMM) to a state DOT construction project. The project was developed in-house and was contracted with special provision for the work to be performed under a performance-based specification. The paper presents a general overview of the project, including the scope of work, how deep mixing was selected as a design element, plan and specification development issues, installation methods, construction issues, and project costs. Results of a lab testing program for the stress/strain behavior of deep mixing cores from the site are presented in addition to an in-situ field monitoring program investigating load and deflection response in the improved columns and surrounding soils.