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Mechanical Excavator Performance in Yucca Mountain Tuffs
A research effort of four phases is in progress at the Colorado School of Mines. The overall program will evaluate the cutability of welded tuff and other lithologies likely to be excavated...

The Adoption of Mechanized Excavation Techniques for the Superconducting Super Collider
The Superconducting Super Collider (SSC) is the latest and largest in a line of high-energy physics accelerator projects. The five increasingly energetic accelerators which make up the...

Principles of the NATM and Other Uses of the Geologic Monitoring Techniques
The NATM (New Austrian Tunneling Method) differs in several respects from other construction methods. Also referred to as the 'sequential support method' or the...

The Standard Contract's Delivery Commitment Schedule Process
The Standard Contract for the Disposal of Spent Nuclear Fuel and/or High-Level Radioactive Waste specifies various activities necessary for the eventual acceptance of spent nuclear fuel...

Conclusions from Project-90 With Regard to a Regulatory Framework
A five year performance assessment program, Project-90 [1], has been concluded by the Swedish Nuclear Power Inspectorate, SKI. The project was defined to develop independent assessment...

OCRWM'S Evolving Strategic Planning Process and the 1990 Plan
In 1990, the Secretary of Energy (Secretary Watkins) ordered that all 23 of the Department's major organizations adopt systems of strategic planning. This paper explains the...

Yucca Mountain Near Field Environment Considerations for Engineered Barrier System Design and Performance
Waste emplacement environment will be essentially dry for at least 300 years and will likely continue to be dry for more than 1000 years, both as a result of the unsaturated ambient conditions...

Scenario Evolution: Interaction Between Event Tree Construction and Numerical Analyses
Construction of well-posed scenarios for the range of conditions possible at any proposed repository site is a critical first step to assessing total system performance. Event tree construction...

The Technical Challenge of Mechanized Excavation for Nuclear Waste Repositories
The requirements of mechanized tunnelling and shafting techniques within this newly developing field, namely the excavation of Nuclear Waste Repositories, will challenge the designers...

Recent Development in the Design of Hard Rock Tunnel Boring Machines for the Mining Industry
Underground development for nuclear waste storage will possibly require tunnels to be excavated in a variety of rock conditions and configurations. Recent innovations in Tunnel Boring...

Shaft Boring Machine?A Method of Mechanized Vertical Shaft Excavation
The Shaft Boring Machine (SBM) is a vertical application of proven rock boring technology. The machine applies a rotating cutter wheel with disk cutters for shaft excavation. The wheel...

Mechanical Tunnel Excavation in Welded Tuff
The Technical Review Board for the United States high-level radioactive waste facility at Yucca Mountain has recommended maximum use of 'the most modern mechanical excavation...

A First Look at Roadheader Construction and Estimating Techniques for Site Characterization at Yucca Mountain, Nevada
The Yucca Mountain site characterization program will be based on mechanical excavation techniques for the mined repository construction and development. Tunnel Boring Machines (TBM's),...

Design, Selection, and Application of Disc Cutters in Hard and Abrasive Rock
Disc cutters have been used on tunnel boring and shaft boring machines for many years and are a proven method to bore hard rock. This paper will study the important parameters which effect...

Visualizing the Performance of Structural Optimization Processes
Graphical constructions are discussed that enable the performance of iterative structural optimization processes to be evaluated visually. The first, a basins of attraction construction,...

A PC-CAD System for Prefabricated Steel Bridges
A microcomputer-aided analysis and design system for prefabricated steel bridges is presented in this paper. The system was customized to perform all the required engineering to analyze,...

Strategies Which Permit Multiple Discrete Section Properties per Member in 3D Frameworks
Strategies for discrete structural optimization of 3D steel frames with coupled section properties are presented. These strategies include linearized branch and bound, simulated annealing,...

Getting the Lead Out
When officials from Omaha, Neb. announced an ambitious plan to revitalize an abandoned stretch of land along the Missouri River, the land itself presented one of the biggest problems....

Closing Hazardous Landfills
Designing and constructing covers for uncontrolled hazardous-waste landfills can pose some special problems�such as differential settlements as great as 50% of landfill thickness. Under...

Building GIS Relationships Spatially and Politically
This paper advocates that the technological aspect of building a spatial GIS is not the critical factor for a successful multi-participant installation. Rather the political relationships...

 

 

 

 

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