Nonlinear Fracture Process Zone in Rock
A study of the fracture process zone was conducted to gain an understanding of the physics of crack propagation in rock. The nondestructive testing technique of acoustic emissions was...
Oil Shale Fracture Characterization by a New Model
Fracture toughness of oil shale is a property which is essential for fracture characterization needed for energy resource development and recovery. However, a data base for fracture toughness...
Simulation of Rock Fracture with the 3-D SHALE Code
The 3-D SHALE code simulates the propagation of stress waves and the occurrence of fracture in brittle solids. The physical models and numerical methods in this code are similar to those...
Prediction of Highway Construction Noise Levels
A model for the prediction of noise levels from highway construction operations has been developed under sponsorship of the Federal Highway Administration (FHWA). Noise sources are geometrically...
Noise and Air Blast from Construction Blasting
Noise generated by construction blasting differs from other construction noise because of its frequency content. The audible high frequency portion is accompanied by a non audible, lower...
Vehicle Sound Power measurement Using the Acoustic Intensity Method
The use of the two microphone Acoustic Intensity Method of obtaining accurate measurement of over-all sound power of large wheel loaders is described. This system is in operation, within...
Cost Assessment of Construction Noise Control
The results of a series of studies have provided noise control engineers with a method to estimate off-site construction noise levels and the cost of reducing these to acceptable levels....
Highway Noise: FHWA Requirements and Barrier Design
Since 1973, the Federal Highway Administration (FHWA) has required noise studies for nearly all proposed roadways and roadway improvements that receive federal aid. An overview of these...
Standardizing Noise Barrier Field Measurements
American National Standards Working Group S12-6 was organized in 1979 to draft a standard for the acoustical measurement of outdoor noise barriers. The current version of the draft standard...
The Noise Mitigation Plan for Stapleton Airport
In March 1984, seven communities in the vicinity of Denver's Stapleton International Airport completed a year-long study of methods to reduce the adverse noise effects from...
Noise Characteristics of Alternative Urban Transit Technologies
The noise characteristics of alternative transit technologies for an urban area are summarized. Among the transportation technologies considered are a busway system, light rail transit...
Summary of the Accomplishments of the Federal Rail Transit Vibration and Noise Control Technology Program
The U. S. Department of Transportation's Urban Mass Transportation Administration and Transportation Systems Center have played an active role in assisting the U. S. rail...
Noise Assessment, Measurement, and Mitigation, an OSHA View
A discussion is presented on the Occupational Safety and Health Administration (OSHA) 29 CFR 1910. 95 General Industry noise exposure standards and the 29 CFR 1926. 52 and 1926. 101 Construction...
Electric Utility Noise Emissions
Environmental regulations require that impact statements for new electric utility and industrial power plants include an evaluation of noise emissions. Variations in equipment sound power...
Environmental Noise Control for Industrial Facilities
The authors present a brief discussion of the criteria used to evaluate environmental noise control problems. Then, they discuss environmental noise control in the power, petroleum, gas...
Cost-Effective Design of Practically Vibration-Free High-Technology Facilities
Advanced electro-optical equipment, such as that used in the production of integrated circuits, requires clean environments with extremely limited vibrations. Ground motions, personnel...
Site Selection and Building Design for Minimizing Vibration
Over the last five to ten years, line resolutions required for state-of-the-art semi-conductor wafers have dropped to well below 1 micron. As a result, controlling environmental building...
Auditors Eye the Environment
Environmental audits are being used by an increasing number of companies, and are providing a substantial new market for environmental engineers. Environmental audits are formal self-appraisals...
Soil Nailing Supports Excavation
Excavation for the PPG Headquarters complex in Pittsburgh, Pa. was critical because the site is adjacent to three historically important buildings. Soil nailing, a method of in situ earth...
Can Clay Liners Work?
Nearly all liners for landfills and surface impoundments were constructed from compacted clay until about five years ago. But this is no longer so. In the past few years, clay liners used...
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