DFI Magazine January/February 2020 - 95

Exposed face of jet grout underpinning columns beneath existing structure

FEATURE

ARTICLE

Jet Grout Underpinning to Support the Waterman Hospital
The expansion of the Waterman
building. An ERS consisting of soldier
Geotechnical Information
Hospital in Tavares, Florida, included an
beams-and-lagging with tieback anchors
Tavares, Florida is located about 40 mi (65
addition to the Emergency Department.
was selected to support the in-situ soil
km) northwest of Orlando and is
This addition was located adjacent to the
away from the existing structure.
surrounded by multiple large lakes. The
existing hospital building in a congested
However, an ERS consisting of structural
subsurface conditions at the project site are
area with limited access. The north side of
jet grout underpinning with tieback
typical of Central Florida and consist of
the addition was bordered by the ambuanchors was chosen to support the
loose-to-medium dense sand with
lance drop-off area, and the south side of
existing building and the soil underlying
occasional layers of silty sand to a depth
the addition was bordered by the helipad
the structure.
greater than that for the proposed
landing area. Understandably,
excavation. Groundwater was
both areas had to remain open and
encountered below the bottom of
fully accessible 24 hours a day, 7
excavation at a depth of about 25 ft
days a week.
(7.6 m) below existing grade.
To construct the new addition
Based on the geotechnical report,
to the Emergency Department, an
the soil conditions were very
excavation approximately 20 ft
uniform throughout the depth of
(6.1 m) deep was required immeexcavation; however, the deposit
diately adjacent to the existing
was broken up in a few places with
building, which was founded on a
backfill from previous excavations
slab on grade. The earth retention
for relatively shallow utilities.
system (ERS) was required to
At the project site, the loose
support not only the ambulance
fine-grained sands contain minimal
drive-up and access walkway to
silt or clay content or cementation
the helipad but also the existing Layout of the project site (new construction outlined in red)

AUTHORS

Stanley L. Worst, P.E., Piotr Kozlowski and Matthew J. Niermann, P.E., Schnabel Foundation Company

DEEP FOUNDATIONS * JAN/FEB 2020 * 95



DFI Magazine January/February 2020

Table of Contents for the Digital Edition of DFI Magazine January/February 2020

Contents
DFI Magazine January/February 2020 - Intro
DFI Magazine January/February 2020 - Cover1
DFI Magazine January/February 2020 - Cover2
DFI Magazine January/February 2020 - Contents
DFI Magazine January/February 2020 - 4
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