PERMFILE52862

• Permit No: M1997054
• IBM Index Class Name: Permit File
• Section_Exhibit Name: EXHIBIT D MINING PLAN
• Media Type: D
• Archive: No

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6. Calculation
6.1 Calculate the unconfined comprtssive strength of the
specimen by dividing the maximum load carried by the
specimen during the test by the cross-sectional area calcu-
lated and express the result to the nearest 10 psi (68.9 kPa).
7. Report
7.1 The report should include the following:
7.1.1 Source of sample including project name and loca-
tion, and, if known, storage rnvironment. The location is
frequently specified in terms of the borehole number and
depth of spixamen from collar of hole.
7.1.2 Physical description of sample including rock type;
location and orientation of apparent weakness planes, bed-
ding planes, and schisotosity, large includons or inhomo-
geneitits, if any.
7.1.3 Date of sampling cad testing.
7.1.4 Spiximea diameter and length, conformance with
dimensional requiremenu (see Note 4).
7:1.5 Rate of loading or deformation rate.
r7.1.6 General indication of moisture condition of sample
at time of test such az as-received, saturated, laboratory air
dry, or even dry. It is recommended that the moisture
condition be more precisely determined when possible and
reported az either water content or degree of saturation.
7.1.7 Unconfined compressive strength for each specimen
az calculated average unconfined compressive strength of all
specimens tested, standard deviation or coefficient of varia-
tion.
7.1.8 Type and location of failure. A sketch of the
fiactured sample is recommended.
7.1.9 Other available physical data.
Note 3-If ody cores with a length-to•diameter ratio (L/D) of lest
than 2 ate available, these may be used for the tact and this form noted in
.the report However, alength-ttsdiameter ratio (LJD) az close to 2 as
posdble shoWd be used. Ibis apparent compressve strength may then
be corrected in aocoNana with We following equation:
C = C,/(0.88 + (0.24b/h))
whore:
C =computed comprssive s[terrgth of an equisaleat LJD 2
apedmen,
C, =measured compressive saeagth of the speeimea tested,
b =test ewe diameru, cord
h =test rate height
Nore 4-ibe number of spedmew tested may depend upon avail-
ability of speumett; but normally a miaimnm of tea is preened. 1be
cumber of speeimeas tested should Ife indicted. 7be statistical basis of
relating the requited number of speametu to the variability of measirre-
mrnts is given is Rewmmeaded Practice E 122.
8. Precision and Bias
8.1 The variability of rock and resultant inability to
determine a true reference value prevent development of a
meaningful statement of bias. Bata are being evaluated to
determine the precision of this test method. In addition, the
subcommittee is seeking pertinent data from users of the
method.
9. Keywords
9.1 compression testing; compressive strength; loading
tests; rock
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pfsm rlph(s, end the risk o! Nlr6rpement of such rights, are emirely Ihelr own respavGSiDildy.
This standard b suejea fo revbkn M any time Dy the responslys tsrhnkal oommMee and must !>e ravbwed every !iro years end
Unof revised, etthw reapproved a wehdrewn. Your commems ere imltetl elMer M revision o! this standard or far addttipW standertls
and should be addressed fo ASTM Heedpuerters. Your cammema wlll recsve careful consideration of a meeting o! the responsiole
fschnk:el oommMee, whACh you may eaerM. ll you feel the( your comrnertts Aave nq received a lair hear/rig you slroultl make Your
vNwa kMwn ro tM ASTM CamrNaes an Stentlartls, 7976 Haw N., 1'hlletle/pua, PA 19103.
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