PERMFILE52862

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~~ Desfgriation:.D'2664 -:86E'

Standard Test Method for
Triaxial Compressive Strength of Undrained Rock Core
Specimens Without Pore Pressure Measurements'
This sundard u issued under the fixed designation D 2664; she Dumber immodiatdy following We de5igution indiates the yor of
original adoptiao or, in she rase of rvvition, Nc year of Ian rtvisioo. A oumbv io partnthaes iodiates the year of last rnpproval. A
superseripl [pfllOn (1) Indleafef an Cdllanal change rata me 1851 RvW08 Or rgppmal.
" NoTC-Secrion I I wu added edi[orially Dcamber 1991
1. Scope
I.l This test method covers the determination of the
strength of cylindrical rock core specimens in an undrained
state under triaxial compression loading. The test provides
data useful in determining the strength and elaztic properties
of rock, namely: shear strengths at various lateral pressures,
angle of internal friction, (angle of shearing resistance),
cohesion intercept, and Young's modulus. It should be
observed that this method makes no provision (or pore
pressure meazuremenu. Thus the svength values determined
are in terms of total stress, that is, not corrected for pore
pressures.
1.2 The values stated in inch-pound units are to be
regarded az the standard.
• 1.3 This standard may invofve hazardous materials, oper-
!ians, and equipment. This standard does not purport to
address all ojthe safety problems associated with its use. /t is
the responsibility of the user of this standard to establish
appropriate safety and health practices and determine the
applicability oJregulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards..
D4543 Practice for I'repazing Rock Core Specimens and
Determining Dimensional and Shape Tolerancesr
E 4 Practices for Load Verification of Testing Machines3
E 122 Recommended Practice for Choice of Sample Size
to Estimate the Average Quality of a Lot or Process°
3. Significance and Use
3.1 Rock is known to behave az a function of the con-
fining pressure. The tnaxial compression test is commonly
used to simulate the stress conditions under which most
undergound rock masses exist.
4. Apparatus
4.l Loading Device-A suitable device Cor applying and
measuring axial load to the specimen. It shall be of sufficient
' This test method u under the jurisdiction o(ASTM Committer 618 on Soil
d RarY and is the dirttt responsib0iry of Subcommina DI8.12 0o Rock
'erlunio.
CWrsent edition eppmved Ott. 31, 1986. Published December 1966. Originally
published is D 2664 - 67. tier pterious edition D 2664 - 80.
' Annual Book of ASTM Standardr, VoI 04.08.
s Annul Baok of ASTM Standardr, Vol 07.01.
' Annul Book of ASlM Ssandardt. Vol 14.02.
capacity to apply load at a rdte conforming to the requirat
menu specified in 7.2. It shall be verified at suitable time
intervals in accordance with the procedures given in lprao-
rites E 4 and wmply with the requirements prescribed in the
method.
4.2 Pressure-Maintaining Device-A hydraulic pump,r~
pressure intensifier, or other system of sufficient capacity td;
maintain constant the desired lateral pressure, ay.
Norte 1-A Dresssre intetssifier as described by Ilrooard Obert ins
U.S. Bureau of Mina Repon of Inves[igaGOtrs No. 6332, "An [napen-
sive Triaxial Apparatus for Testing Mine Rock" has been found to
fulfill the above requirements.
4.3 Triaxial Compression Chambers-An apparatus in
which the test specimen may be enclosed in an impermeable
flexible membrane; placed between two hundred platens,'
one of which shall be spherically seated; subjected to a
constant lateral Fluid pressure; and then loaded axially to
failure. The platens shall be made of tool steel hazdened to a
minimum of Rockwell 58 HRC, the bearing faces of which
shall not depart from plane surfaces by more than 0.0005 in.
(0.0127 mm) when the platens are new and which shall be
maintained within a permissible variation of 0.001 in. (0.025'
mm).,In addition to the platens and membrane, the apps-a
tarns shall consist of ahigh-pressure cylinder with averflow'j
valve, a base, suitable entry ports for Slling the cylinder with
hydraulic fluid and applying the lateral pressure, and hoses,.
gages, and valves az needed.
4.4 Deformation and Strain-Measuring Devices-I-Iigh-
grade dial micrometers or other'measuring devices graduated
to read in 0.0001-in. (0.0025-mm) units, and accurate within
0.0001 in. (0.0025 mm) in any 0.0010-in. (0.025-mm) range,
and within 0.0002 in. (0.005 mm) in any 0.0100-in. (0.25;
mm) range shall be provided for measuring axial deforma•
lion due to loading. T-hese.may consist of micrometer screws,
dial micromeurs, or Gneaz variable differential trdnsformets
securely attached to the high pressure cylinder.
4.4.1 Electrical resistance strain gages applied directly to
the rock specimen in the axial direction may also be used. la
addition, the use of circumferentially applied strain gages
permit the observation of data necessary in the calculation of
Poisson's ratio. In this case two axial (vertical) gages should
be mounted on opposite sides of the specimen at mid-heigh
s Assembly and detail drawings of u apparaw that man rhea tequisn
and which is designed m aswmmadatc 2'/rio. (53.975-mm) diameter spat
and operate at a lateral fluid prtssurt of 10 000 pL (689 MPa) are available
Headquarters. Request Adjuntt No. 12.42664P-00.
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