Excavation for a cut and cover highway tunnel underpass was designed and constructed using deep soil mixing. Several historic mansions located close to the tunnel alignment required special attention to restrict construction induced ground movements that could damage them. Design procedures for this excavation support wall were developed considering the different properties of soil, soil-cement and steel. Both design and construction practices followed procedures intended to limit ground movements. Results from a program of instrumentation and monitoring demonstrated that the approach implemented on this project succeeded in meeting the stringent requirements to limit ground movements.
In Situ Remediation Using Soil Mixing
Soil mixing, originally developed as a means for structural soil improvement, has evolved into a system for effectively treating soil in situ to meet environmental remediation cleanup objectives. Using soil mixing in remedial efforts has