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Segmental Tunnel Lining Meets `Buy American'
Segmental concrete tunnel lining is the other innovation proven during construction of the Washington Metropolitan Area Transit Authority (`wmata'). Although `wmata's'...

Resilient Moduli of Soils
Laboratory Conditions
Historically, structural pavement design has been based on static testing techniques, such as the CBR. More recently, the profession has placed increased emphasis on repeated load testing...

Stabilizing a `Mann'-Sized Sinkhole
On Sept. 21, 1988, a sinkhole suddenly developed beneath a transmission/distribution effluent pipeline on Mann Road in Orange County, FL. Initially it measured 30 ft in diameter and 8...

Augering Answers
Leaking storage tanks, a long time environmental problem, are now being addressed nationally with cleanup regulations. Clearly, inexpensive and quick remediations are needed. This article...

Beam-Supported Slabs Subject to Edge Loading
A model is presented which allows a designer to estimate stiffnesses required to provide a given critical buckling load in beam-supported slabs subjected to biaxial edge loading, such...

Repair of The Hinckley Dam Embankments
The New York Power Authority was licensed in 1982 to construct and operate a 9 Mw hydroelectric facility at the existing Hinckley Dam near Utica, New York. Soil exploration programs undertaken...

Modern Technology in an Ancient Environment?The Answan II Power Plant
The Aswan II power plant is located at the old Low Aswan Dam in Southern Egypt. This dam was constructed in the early years of the century in order to provide irrigation water for cash...

Waterstop Technology?The Next Chapter
Water leakage through and around failed waterstops in concrete structures can cause serious flooding, damage to equipment, affect structural stability, and pose potential safety problems....

The Impact of Inlet Flow Characteristics on Low Head Hydro Projects
This paper discusses the intake civil designs, addressing head loss and flow distribution into the turbine intake. The impact of poor flow quality on head losses, turbine performance,...

The European Underground
Three tunneling projects in Europe are described: a tunnel bored under two rivers in Lyon, France, a subway station constructed as a mined tunnel in Vienna, Austria and a tunnel mined...

Cedar Falls Roller Compacted Concrete Dam
This paper presents the design, material testing, quality control, and construction considerations applicable to a small Roller Compacted Concrete (RCC) dam. The Cedar Falls RCC dam is...

Design of Seepage Control Systems for RCC Dams
As the reservoirs of the first generation of roller compacted concrete (RCC) dams have been filled, several have exhibited significant amounts of seepage, a fact that has been of concern...

Strengthening and Raising Gibraltar Dam with RCC
The initial phase of a multiphase investigation program was completed by USBR (U. S. Department of the Interior, Bureau of Reclamation) personnel to develop geotechnical laboratory testing...

Compaction Parameters of Roller Compacted Concrete
Density in roller compacted concrete is usually achieved through vibratory compaction. Factors of major influence in attaining densification of a structure with a vibrating roller are...

Proportioning RCC Pavement Mixtures
The U. S. Army Corps of Engineers has begun using roller compacted concrete for construction of heavy-duty pavements and low volume streets and roads which are exposed to low-speed tracked...

Corps of Engineers Experience with RCC Pavements
Roller compacted concrete pavements were first developed in the U. S. by the Corps of Engineers in 1975. Since that time, RCC pavements have been constructed throughout much of the U....

Evaluating Sinkhole Hazards in Mantled Karst Terrane
Sinkholes are the most serious geologic hazard in karst terrane because they can damage structures, drain ponds and lakes, and allow direct infiltration of groundwater contamination. The...

Geophysical Exploration for Cavity Detection in Karst Terrain
Detection of poor quality rock and voids has been a major research activity of the U. S. Army Engineer Waterways Experiment Station (WES) since the mid 1970's. The principal...

Exploration of Karst Conditions in Central Florida
Walt Disney World, which comprises some 28,000 acres (11,000 ha) in central Florida, is underlain by cavernous limestone and is characterized by karst topography; with distinct low ground...

Evaluation of Reservoir Seepage in Karst Topography
Areas where seepage is likely to occur in the karst environment of the proposed West County Reservoir, Roanoke County, Virginia have been indentified. Solutioning exists in the form of...

 

 

 

 

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