Sealing the Subway
Although work on the Los Angeles Metro subway is stopped for now, the project has introduced a number of innovations and advances to the American tunneling community, including the use...
Downtown Goes Uptown in Stainless Steel
In an unusual urban planning endeavor, a business district in Houston upgraded infrastructure, and added stainless steel design elements to unify the area. About $11 million was raised...
How Creative Engineers Think
Engineering giants think in a non-traditional way, combining scientific thinking with creative thinking, which results in technological thought. The author gives examples of how Gustave...
Tough Conditions, Innovative Solutions
Two major innovations in U.S. construction practice are part of the solution to a complex and difficult portion of the Massachusetts Highway Department's Central Artery/Tunnel...
Keeping Tabs on Two Tunnels (available in Geoenvironmental Special Issue only)
Engineers devised a unique liquid level monitoring system to check vertical movements in 90-year old twin subway tunnels. Construction for the Boston Central Artery/Tunnel project requires...
The San Francisco Connection
An underground switchyard and storage facility for San Francisco's Municipal Railway challenged the limits of both cut-and-cover and tunneling in loose soil. The project was...
Paradise Crossed
Hawaii's Interstate H-3 project is the winner of the 1998 Outstanding Civil Engineering Achievement Award. The highway, built to alleviate commuter congestion and to link...
Design and Construction of Earth Retaining Systems
This proceedings,
Grouts and Grouting
A Potpourri of Projects
This proceedings,
Net Gains
Project Web sites can be as simple as a repository for drawings and documents or complex enough to allow real-time dialogue between interested parties and project monitoring. One of GZA's...
Cure for Thinning Concrete
After placing 75% of the concrete liner for twin 4.6 km transit tunnels in Portland, Ore., engineers discovered areas of concrete that were thinner than the prescribed 305 mm thickness....
Below Boston's New Bridge
The Charles River Bridge, a 10-lane cable-stayed structure will be the widest cable-stayed bridge in the world. The bridge is 1,460 ft long with a main span between towers of 745 ft. This...
Compensation Grouting
To minimize ground movement while tunneling a sewer 5 m below Toronto's Spadina subway line, engineers used special instrumentation, tunneling control and grouting to limit...
Tunneling Against Time (Available only in the Geoenvironmental Special Issue)
The phenomenal growth of Las Vegas has prompted nearly $1 billion worth of water-supply projects. A $33 million tunnel scheme�a critical element of the new construction�is on pace. The...
Watching Under Boston
Managing the daily operations of Boston's Central Artery/Ted Williams Tunnel project requires integrating a variety of hi-tech systems to ensure efficient traffic flow. The...
Cutting Off Water in Queens
New York's Transit Authority wanted to dig a new tunnel for a Queens subway connection, but first contractors had to wall-off the potentially contaminated groundwater nearby....
Great Grouts (Available only in Geoenvironmental Special Issue)
Particulate grouting has long posed challenges to those in the geotechnical field. But significant developments in the understanding of hydration and rheology control look promising. Modern...
Los Angeles Metro-TBM Starter Tunnels-Mixed Face Conditions
Twin TBM starter tunnerls with mixed face conditions were successfully mined by roadheader with steel rib and shotcrete initial support beneath the Hollywood Freeway. Tunneling and total...
Boston's Central Artery/Tunnel Project: Challenging Problems, Innovative Solutions
Boston's Central Artery/Tunnel (CA/T) Project is the largest, most complex highway project ever undertaken in the United States. Conceived a quarter centrury ago, the project...
Toward a Healthy Harbor
Once dubbed the filthiest harbor in America, the Boston Harbor is now the model of recovery. The Boston Harbor Project, a court-mandated 12-year, $3.4 billion cleanup, includes a sprawling...
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