Western Washington University Student Recreation Center
Merit Engineering has provided complete geotechnical engineering
services for construction of the project. The subject property was the campus of Western
Washington University in Bellingham, Washington. The project included the construction of a
multi-floor, Student Recreational Center that included an indoor Olympic-sized pool, an indoor
track, various indoor racquetball and tennis courts, and weight rooms. The focus of the study
included complete geotechnical analysis of surface and subsurface soil and groundwater conditions,
as well as a feasibility study of foundation options and recommendations. The structure had to
be founded on bedrock, but the bedrock at this location is found at various depths across campus.
The bedrock profile is so erratic that in one area it may be found 10´ below the surface, and
then ten feet away, the bedrock may be 30´ below the surface. This kind of bedrock profile is
common in the Chuckanut Formation, which consists of various layers of young sedimentary rocks
that have been folded and faulted into a jumbled mess. Ultimately, almost 300 piles were installed
by drilling through the clay subsurface and into the bedrock. These high capacity piles are
known as “shaft with rock socket” piles and have 2-3 times more bearing capacity than normal
end-bearing on rock piles. With knowledge of the bearing capacity of the bedrock and specified
strengths of the concrete used for the piles, these piles would absorb the weight of the
structure and provide necessary integrity to the foundation.
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