Accession Number:

AD0745286

Title:

The Variation of the Angle of Internal Friction With Size Consist for Mechanically-Chipped Material

Descriptive Note:

Annual technical rept. 1 Apr 1971-31 Mar 1972

Corporate Author:

PENNSYLVANIA STATE UNIV STATE COLLEGE COLL OF EARTH AND MINERAL SCIENCES

Personal Author(s):

• Raab, Donald E.
• Saperstein, Lee W.

Report Date:

1972-05-06

Pagination or Media Count:

72.0

Abstract:

In order to improve aspects of materials handling in the rapid excavation process, research is underway to characterize the muck from mechanical tunnel boring machines. The specific project involves the correlation of the angle of internal friction, phi, to the size consist, often termed gradation, of this mechanically-chipped material. Existing references demonstrate that this angle depends upon mineral type, and for a given mineral type upon size of particles. Particle shape is usually a function of mineralogical character and is not as important a parameter in influencing this angle. Seven samples collected from tunnels located throughout the U.S. have been analyzed for gradation.

Descriptors:

• *ROCK
• *UNDERGROUND STRUCTURES
• CONSTRUCTION
• CORRELATION TECHNIQUES
• INVENTORY CONTROL
• PARTICLE SIZE
• SAMPLING
• TEST EQUIPMENT
• TEST METHODS

Subject Categories:

• Geology, Geochemistry and Mineralogy
• Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE