Seismic Performance of a Deep Soil Mixing Grid: A Magnitude 7.1 Load Test at the Port of Alaska

by Samuel R. Christie, P.E., Principal professional/senior project manager with Kleinfelder in Seattle, WA.,,
Stephen E. Dickenson, P.E., Ph.D., (M.ASCE), President of New Albion Geotechnical, Inc. in Reno, NV.,,
Paul Guenther, P.E., Office manager for COWI North America in Seattle, WA.,,
Sharon A. Walsh, S.E., Port of Alaska modernization program director, overseeing the planning, programming, design, and construction of the new Petroleum and Cement Terminal.,,
, P.E.


Serial Information: Geo-Strata —Geo Institute of ASCE, 2021, Vol. 25, Issue 4, Pg. 32-38

Document Type: Feature article

Abstract: The Port of Alaska in Anchorage (Port) has embarked on a multiphase modernization program that includes the development of a new petroleum and cement terminal (PCT) berth. The berth consists of a pile-supported trestle that connects to a platform located offshore in the Knik Arm waterway (Figure 1). The terminal is located in a dynamic marine environment with numerous design challenges, including tidal fluctuations of as much as 40 ft, design ground motions associated with a magnitude Mw 9.3 subduction zone earthquake, weak foundation soils, and shoreline conditions that are vulnerable to large-scale seismic displacements. Geotechnical input to the seismic design of the pile-supported terminal required synthesis of extensive in-situ and cyclic laboratory testing data, nonlinear deformation analysis (NDA), and layout of a deep soil mixing (DSM) ground improvement zone for mitigation of seismically induced slope displacements.

Subject Headings: Seismic tests | Seismic design | Soil mixing | Ports and harbors | Laboratory tests | Foundation design | Soil tests | Alaska | United States


Return to search