Accession Number:

AD0765296

Title:

Adhesion in Rocks.

Descriptive Note:

Final technical rept. 1 Jan-31 Dec 1972

Corporate Author:

BUREAU OF MINES TWIN CITIES MN TWIN CITIES MINING RESEARCH CENTER

Report Date:

1973-03-01

Pagination or Media Count:

46.0

Abstract:

The objective was to ascertain the magnitude of forces responsible for coherency of rock by quantifying the strength of the attractive forces operating between minerals in rock. These forces oppose stresses set up in various rock fragmentation processes, hence strength measurements of these forces might prove useful in designing more efficient rock fragmentation methods. Methods were developed for estimating strength of intergranular adhesion in rock. Examination of bicrystals broken at the crystalline interfaces reveals that bonds responsible for this adhesion operate only over a portion of the interfacial area. This work demonstrated that strength tests can be conducted on small selected areas, i.e., grain boundaries in rock. This permits a determination of small scale zones of strength or weakness which may be related to the overall strength of the rock.

Subject Categories:

  • Soil Mechanics
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE