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Portable Bore-hole Shear Strength Tester for Coal.

Authors
Handy-RL; Klockow-DE; Ferguson-EG
Source
NTIS: PB/221-352 Available for Reference At Bureau Libraries :82 pages
Link
NIOSHTIC No.
10000922
Abstract
The objective of this research was to devise and test an apparatus to rapidly evaluate the cohesive and frictional strength of coal in situ, in order to increase the safety and percentage of coal recovery from underground coal mines. Since it is extremely difficult to obtain large samples of coal for laboratory testing, the borehole shear tester promises to be of significant value to mining engineers and researchers in determining the physical properties of coal and related strata. Such physical properties are essential to the use of finite-element analyses or other techniques of mine design. During the first year, a device was designed utilizing the borehole shear test principle from soil shear strength testing. The opposing corrugated plates were forced outward to exert a controlled contact pressure against the sides of a previously bored hole, and then the plates were slowly pulled along the axis of the hole to cause shearing of coal in contact with the plates.
Publication Date
19730101
Document Type
CP; Final Contract Report;
Fiscal Year
1973
NTIS Accession No.
PB-221352
NTIS Price
A06
Identifying No.
OFR 43-73
NIOSH Division
DRC;
Source Name
NTIS: PB/221-352; Available for Reference At Bureau Libraries
State
IA;
Performing Organization
Iowa State University
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