RECENT GEOTECHNICAL/UNDERGROUND
ENGINEERING PROJECTS
Sewer
Relief Tunnel Value Engineering Design and Construction, St. Louis, MO
Working
directly with the tunnel construction contractor and specialty geotechnical
construction contractors, completed design of two jet grout supported
tunnel access shafts and a third outfall shaft to be supported with a
soldier pile and lagging system as part of the construction of 6,400 ft.
of 11-ft. finished diameter relief sewer tunnel. Developed and installed
a vibrating wire strain gage instrumentation system to monitor compressive
stresses imposed on each of the unreinforced jet grout supported shafts
during soil excavation and subsequent blasting operations required to
extend the shaft to invert level through limestone to depths in excess
of 160 ft. Evaluate daily strain gage data in conjunction with ongoing
construction activities data throughout construction to ensure the satisfactory
performance of the shaft support walls.
A 4-ft thick mass of unreinforced jet grouted soil supports 36 ft. diameter
tunnel access shaft through 65 ft. of overburden soils to the top of karst
susceptible limestone bedrock. Jet grouting and post jetting pressure
grouting limited groundwater flow into 160 ft. deep TBM access shaft.
Storm
Drain Relocation, Waltham, MA
Providing field
investigations and evaluations related to the realignment and extension
of an existing storm drain through variable soil and bedrock conditions.
Geotechnical evaluations include relative cost estimates for underground
construction and recommendations for soil and rock excavation to be completed
in a tight urban area.
MBTA
Silver Line Phase III Tunnel Section, Boston, MA
Working as a specialty
consultant and member of the project team selected to complete the design
of bus transit tunnel from South Station to Boylston Street in Boston.
Project involvement includes evaluation of anticipated ground conditions
and corresponding behavior in response to construction in conjunction
with alternative ground improvement techniques that may be required to
control groundwater flow and limit construction related ground movements
and associated impacts to adjacent structures.
OTHER
SELECTED GEOTECHNICAL PROJECT DESCRIPTIONS
Central
Artery/Tunnel Project - Contract C11A1, Boston, MA.
Project Manager responsible for design coordination of all underground
aspects of a 2,200 ft. long cut-and-cover highway tunnel, which passes
beneath an active subway station. Ground improvement applications, integral
to the design of the stacked drift tunnel underpinning system developed
to support the subway, include soil reinforcement to control ground movements
associated with tunneling and permeation (chemical) grouting to control
groundwater and prestabilize up to 40 ft. of granular soil. A permeation
grouting program was also developed and specified as a remedial measure
to limit groundwater flow beneath the cut-and-cover slurry walls.
Grout manifold used to carefully inject sodium-silicate grout to stabilize
granular glacial till deposits to permit tunneling and underpinning of
an active subway station, Boston, MA.
Whitehall Street
Subway Expansion, New York, NY.
Project Manager responsible for the design of a temporary 25 ft. high
jet grout column excavation support wall, internal bracing and utility
hanging system to permit the cut-and-cover extension of a subway station
in downtown New York City in an area of densely spaced utilities. Angled
jet grout holes provided a means to install the excavation support wall
in and around the active utilities and to provide groundwater control
during excavation. Jet grout columns were also designed to provide support
to existing utilities adjacent to a smaller open cut excavation on the
project.
Granite Saw Foundation,
Baltimore, MD.
Geotechnical Engineer responsible for developing a soil mixed stabilized
ground support system to support a 30 by 50-ft. granite cutting saw foundation
in loose alluvial sand and silt deposits. Interconnected, 6-ft. diameter
soil mix columns were designed to: limit consolidation related settlement
by extending foundation loads to competent underlying strata, add mass
to the proposed foundation system to reduce the impact of repeated dynamic
vibration loading, and provide temporary excavation support and groundwater
control to permit final foundation excavation and construction.
Rancocas Creek
Light Rail Bridge, Riverside, NJ.
Design-Build engineering consultant responsible for the development of
a ground stabilization alternative to provide support for approximately
400 ft. of MSE approach embankment constructed over soft fibrous peat
deposits. A series of 150-ton capacity Vibro Concrete Columns (VCCs) were
installed at a 7 to 9-ft. spacing, through the peat and into underlying
alluvial deposits. Embankment loads were then transferred to the VCC network
through a geogrid reinforced load transfer platform that was designed
and constructed immediately above the ground reinforcing columns. Post-construction
embankment settlement was limited to less then 1.5 in.
Vibro Concrete Columns (VCC) support light rail bridge approach embankment
constructed over soft fibrous peat deposits, Riverside, NJ.
City
of Providence Water Treatment Facility, Scituate, RI.
Design-Build engineering consultant responsible for development of a 25-ft.
diameter by 15-ft. deep jet grout shaft constructed to provide access
to a 12-ft. wide, 70 year old cast-in-place concrete water transmission
conduit. Interconnected jet grout columns provided a 5-ft. thick ring
of stabilized ground to support the shaft excavation and controlled groundwater
flow through the fine sandy soils and into the open excavation. Groundwater
flow was limited to less then 1 GPM without supplemental grouting to permit
upgrade and repair work to be completed on the transmission line in the
dry.
Interconnected jet grout columns form a temporary work shaft that controls
groundwater inflow and "running sand" providing access to 90-in.
diameter cast-in-place water transmission line, Scituate, RI.
Barus & Holley
Building Addition, Providence, RI.
Geotechnical Consultant responsible for development of a hybrid grouting
system to transfer new building loads above voids encountered immediately
above approximately 100 ft. of an abandoned railroad tunnel. Low mobility
compaction grouting was initially completed at over 60 locations above
the tunnel alignment to fill voids without adding significant pressure
to the tunnel lining. A series eight jet grout arches were then constructed
immediately above the tunnel crown using interconnected jet grout columns.
The arches were designed to transfer additional building loads to the
competent bedrock adjacent to the tunnel structure. The hybrid grouting
program saved several weeks of construction time and over $300,000 in
alternative deep pile foundation system costs.
Storage Tank Foundation,
Baltimore, MD.
Geotechnical engineer responsible for development of a value engineered
foundation support alternative to provide a 4 ksf allowable bearing pressure
beneath a 50 ft. diameter caustic fluid storage tank. A system of stone
columns was designed for installation through 15 ft. of soft silt and
clay, below the groundwater table to reduced consolidation settlements
that were estimated to be in the range of 10 in. Post construction survey
data indicated only 2 in of total settlement and no differential movements
under service loading.
Stone columns stiffen soft, saturated alluvial silt deposits to limit
settlement of a caustic fluid storage tank, Baltimore, MD.
Lucent Facility
Building Addition, Sturbridge, MA.
Design-build consultant responsible for developing a drilled minipile
support system for a building addition. Dealing with tight equipment access,
the alternative minipile foundation support system was isolated from the
existing building foundation loads and constructed so as to maintain the
existing cast-in-place foundation wall thereby precluding the demolition
of the wall and replacing the wall with a new CMU firewall structure.
Gallery at Harborplace,
Baltimore, MD.
Geotechnical design and resident field engineer for construction of a
four-level, 120,000 sq. ft. below-grade parking facility. Design phase
responsibilities included development and implementation of subsurface
exploration program, implementation of in-situ field tests, preparation
of geotechnical design report and contract documents. During construction,
responsibilities included review of foundation related submittals, QA/QC
verification and full time coordination of all geotechnical aspects of
below grade construction.
State Transportation
Building, Boston, MA.
Resident geotechnical engineer during subsurface construction of a three-level,
below-grade garage bearing on a mat foundation, constructed adjacent to
historic and structurally-sensitive buildings, utilizing over 1,200 linear
feet of concrete diaphragm walls, tiebacks, and internal bracing. Responsibilities
included completion of subsurface explorations, design report, and preparation
of contract documents and monthly instrumentation monitoring and interpretive
reports.
Federal Highway
Administration (FHWA) Study FHWA/RD-86/185:
Spread Footings of Highway Bridges, Northeastern United States. Project
manager responsible for preparing performance study of 10 highway bridge
foundations including the preparation of instrumentation-related contract
plans and specifications, development and use of new instrumentation equipment
to monitor subsurface settlement profiles and bridge abutment overturning,
and development of a project data management system.
63rd Street Subway
Expansion, New York, NY.
Project Engineer retained to evaluate construction related claim associated
with the installation of jet grout columns to underpin an adjacent building
during the expansion of the existing 63rd Street subway station. In addition
to evaluating: available reports, contractor submittals, constructibility,
and construction sequencing, an evaluation of in-situ jet grout wall permeability
and anticipated construction related groundwater level drawdown was completed.
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