SAME Rock Island Post - May Post Meeting 

Rock Island Post members-

Come join the virtual Rock Island Post  meeting on Thursday, May 19^th at 11:45am. 

Presentation:  

As part of an expansion to the Columbia Blvd Waste Water Treatment facility in Portland, OR, the plant required the construction of 2 additional underground clarifier tanks.  The location selected was immediately adjacent to a slough.  Underlying soils were sands and silts atop the Troutdale, till-like formation at 75-ft depth.  In addition to the support of excavation (SOE) required for tank construction, a significant factor to address was the lateral spreading concern should the design earthquake occur.  The solution implemented was to design and construct two separate secant pile compression rings as the temporary SOE, while simultaneously extending portions of the rings into the till to create shear pins.  These pins were then supplemented with ground improvement elements consisting of deep soil mix panels outside and around the rings, and the use of jet grout panels within the rings.  The presentation will discuss the design challenges, the rationale for the selection of the foundation techniques, and will provide a description and illustration of the sequencing and construction of the system.

Speaker (Andy Anderson, P.E.): Andy is a professional geotecnical engineer working as a Sponsor for Kiewit Foundations Co. since 2019. He was previously the Vice President with another specialty foundation contrator, for whom he started in 1997. There, he over saw offices in New York City, then Seattle and has managed operations in both Western USA and Western Canada, including the large, complex get grouting efforts for the replacement of the downtown Seattle Seawall. Andy earned his degree and a commission from the Royal Military College of Canada. Following his military service, Andy worked overseas in Africa and Asia where he began focusing on the specialty, geotechnical construction field, in particular: Ground Improvement. Andy's experience covers both public and private sector work, from small sized to very large sized clients and projects. Being quadri-lingual, he can operate in English, French, Italian, and Spanish. Andy is experienced with managing and performing work in all phases of geotechnical construction including: estimating, design, design-build, contracting, construction, and seeing to quality and safety.