PERMFILE56525

• Permit No: C1984065
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: App. 4.3-1 Initial Geotech Study
• Section_Exhibit Name: APPENDIX 4.3-1 INITIAL GEOTECHNICAL STUDY LOGGING & TESTING EVALUATION
• Media Type: D
• Archive: No

11
r
•
xial swell is
a measure of
of 0(no swell
subjectively
plotted as
sample swell
potential)
estimated.
The point load strength of a piece
ompressing it between two point loads
occur. A general point load strength
d or the results may be specified as
performed in the direction of the
diametral(ID) index (test is performed
of a drill core]. An anisotropic
as the ratio of Ip to ID. The general
index is as follows:
I ~ ~ [17]
D
where P e load at failure
D .point separation distance
•

periodically made and the percentage a
a function of time. The plot provides
potential. A swell rating on a scale
to 10(very extreme swell potential) is
Point Load Strength.
of rock is determined by c
causing tensile failure to
index(Is) may be determine
an axial(Ip) index [test is
axis of a drill core] or a
in the diametral direction
index(Ipp) may be computed
formula used to compute the
Protodyakonov Number. The Protodyakonov test determines the
resistance of a rock to impact failure. Lumps of coal are placed
in a test cylinder and the number of impacts(n) are recorded that
create a volumometer column of dust of height(R). The Proto-
dyakonov number(f) is determined as follows:
f - 20n
k
ROCK CORES TESTED
[18]
Cores were tested from five zones in Drill Holes No. 3.75
and No. 8A. These zones were as follows: [1] roof of Upper Wheeler
Seam, [2] Upper Wheeler Seam, [3l interburdden between Upper Wheeler
Seam and Lower Wheeler Seam, [4) Lower Wheeler Seam and [5] floor
of Lower Wheeler Seam. A grand total of 125 laboratory tests were
conducted on the five drill hole zones. A summary of the test types
and numbers is presented in Table I. In addition, some 821 total
point load tests. were conducted on [1] all the core from the five
zones in Hole 8A and [2] all the core in Hole 3.75 from the collar
to total depth.
SEEGMILLER IN7ERNATION AL