As part of the BART
South Bay Extension Project (SVRT) structural design team, Sierra Engineering
Group is the engineer-of-record for the design the DSM (Dense Soil Mix) retaining
walls for the subject project. Ultimately the concrete wall facing will act
compositely with the steel soldier piles which are anchored to the wall with
headed welded studs. Due to the sensitive nature of adjacent properties and
utilities, we were charged with examining the wall behavior at various stages
of construction. Our extensive analysis made use of the latest design software
to accomplish this task, namely PYWALL as well as others. Construction is
currently proceeding with the tiebacks already detensioned and the walls behaving
as anticipated. The majority of the
concrete struts which span under the width of the future roadway are in place and
placement of wall reinforcement under way.
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