March/April 2022 - 75

Hybrid Foundation Solution for
Debris Fill, Compressible Soil
Load testing of ductile iron piles
FEATURE ARTICLE
Urban redevelopment projects are
occurring more frequently than ever
before as urban greenfield sites become
limited and city planners and developers
attempt to revitalize existing
underdeveloped neighborhoods. However,
because of the past usage of many
urban sites (some dating back 100 years
or more), designers and construction
teams have to not only engineer foundations
to accommodate the subsurface
soil and ground water conditions, but
also to work around the relic foundations
or structures that have been left
behind from previous developments. In
these cases, a one-size-fits-all approach
to foundations may not yield the most
cost- and schedule-effective approach,
and hybrid foundation systems have to
be evaluated.
Project Background
The Alta XMBLY project is a residential
redevelopment project being constructed
by Wood Partners in Somerville,
Massachusetts. The development
2
consists of a new 63,000 ft (5,853 m ),
8-story building. The bottom three
floors are a concrete podium for parking
and residential purposes, followed
by five levels of wood-framed residential
structure above. Isolated
column loads were up to 850 kips
(3,781 kN), wall loads generally ranged
from 3 to 7.7 kips per linear foot (klf), or
43.8 to 112.3 kN/m, and mat pressures
were about 7 ksf (336 kPa). Site grades
were planned to be increased by 2 to
4 ft (0.6 to 1.2 m) to raise the first floor of
the building out of the floodplain.
2
The site was desirable for residential
development because it is close to
Boston and in proximity to major
highways and public transportation.
The site is located in the Assembly Rowdevelopment
area, a large mixed-use
urban redevelopment.
Prior to the current redevelopment,
the Assembly Row area consisted of
tidal wetlands that were filled to create
industrial areas close to Boston. The area
was used for various manufacturing
operations, oil storage structures and
warehouses. The area also contained
many railroad spurs and lines throughout
the property. Based on a review of
historical maps and photographs, the
site was previously developed to have a
manufacturing building, including a
large smokestack structure present in
AUTHORS Michael J. Weaver, P.E., Haley & Aldrich, Michael Cronenberger, P.E., and Andrew Thompson, P.E., Helical Drilling
DEEP FOUNDATIONS * MAR/APR 2022 * 75

March/April 2022

Table of Contents for the Digital Edition of March/April 2022

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