Publication Abstract

Proceedings of the Deep Mixing 2015 Conference, (DFI)

Wet Soil Mixing for Foundation Support and Liquefaction Hazard Mitigation for the Ventura Cancer Center
Lisheng Shao, Ph.D., P.E., G.E., Hayward Baker Inc., United States; Thang V. Nguyen, Hayward Baker Inc., United States; Gary E. Taylor, Hayward Baker Inc., United States

The Community Memorial Hospital of Ventura, California, proposed to build a new state-of-the-art Cancer Treatment Center with radiation shielding walls and roof. The loose silty soils at the site had the potential to liquefy during an earthquake, which would result in significant settlement under the heavy footing loads. Treatment options included various deep foundation alternatives, as well as several ground improvement methods. The choice of wet soil mixing minimized the disturbance to the adjacent hospital during construction and potential settlement. Wet soil mixing allowed the structure to be supported on a raft foundation, meeting the stringent building total and differential settlement criteria. The authors also performed unit cell 3-D finite element analyses to evaluate the behavior of the wet soil mixing system in seismic loading conditions. This paper highlights the ground improvement design, construction, QA/QC, and the research related to evaluating the effectiveness of soil mixing for liquefaction mitigation.

 article #2064; publication #1013 (DM-2015)