1、Designation:D 2664 95aStandard Test Method forTriaxial Compressive Strength of Undrained Rock CoreSpecimens Without Pore Pressure Measurements1This standard is issued under the fixed designation D 2664;the number immediately following the designation indicates the year oforiginal adoption or,in the
2、case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of thestrength of cylindrical rock core specimens i
3、n an undrainedstate under triaxial compression loading.The test provides datauseful in determining the strength and elastic properties ofrock,namely:shear strengths at various lateral pressures,angleof internal friction,(angle of shearing resistance),cohesionintercept,and Youngs modulus.It should be
4、 observed that thismethod makes no provision for pore pressure measurements.Thus the strength 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 regardedas the standard.1.3 This standard does not purport to addr
5、ess all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:D 4543 Practice for
6、 Preparing Rock Core Specimens andDetermining Dimensional and Shape Tolerances2E 4 Practices for Force Verification of Testing Machines3E 122 Practice for Choice of Sample Size to Estimate aMeasure of Quality for a Lot or Process43.Significance and Use3.1 Rock is known to behave as a function of the
7、 confiningpressure.The triaxial compression test is commonly used tosimulate the stress conditions under which most undergroundrock masses exist.4.Apparatus4.1 Loading DeviceA suitable device for applying andmeasuring axial load to the specimen.It shall be of sufficientcapacity to apply load at a ra
8、te conforming to the requirementsspecified in 7.2.It shall be verified at suitable time intervals inaccordance with the procedures given in Practices E 4 andcomply with the requirements prescribed in the method.4.2 Pressure-Maintaining DeviceAhydraulic pump,pres-sure intensifier,or other system of s
9、ufficient capacity tomaintain constant the desired lateral pressure,s3.NOTE1A pressure intensifier as described by Leonard Obert in U.S.Bureau of Mines Report of Investigations No.6332,“An InexpensiveTriaxial Apparatus for Testing Mine Rock,”has been found to fulfill theabove requirements.4.3 Triaxi
10、al Compression Chamber5An apparatus inwhich the test specimen may be enclosed in an impermeableflexible membrane;placed between two hundred platens,oneof which shall be spherically seated;subjected to a constantlateral fluid pressure;and then loaded axially to failure.Theplatens shall be made of too
11、l steel hardened to a minimum ofRockwell 58 HRC,the bearing faces of which shall not departfrom plane surfaces by more than 0.0005 in.(0.0127 mm)when the platens are new and which shall be maintained withina permissible variation of 0.001 in.(0.025 mm).In addition tothe platens and membrane,the appa
12、ratus shall consist of ahigh-pressure cylinder with overflow valve,a base,suitableentry ports for filling the cylinder with hydraulic fluid andapplying the lateral pressure,and hoses,gages,and valves asneeded.4.4 Deformation and Strain-Measuring DevicesHigh-grade dial micrometers or other measuring
13、devices graduatedto read in 0.0001-in.(0.0025-mm)units,and accurate within0.0001 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 deformation due toloading.These may consist of micrometer screws,dial m
14、i-crometers,or linear variable differential transformers securelyattached to the high pressure cylinder.4.4.1 Electrical resistance strain gages applied directly tothe rock specimen in the axial direction may also be used.Inaddition,the use of circumferentially applied strain gages willpermit the ob
15、servation of data necessary in the calculation of1This test method is under the jurisdiction of ASTM Committee D-18 on Soiland Rock and is the direct responsibility of Subcommittee D18.12 on RockMechanics.Current edition approved Dec.10,1995.Published April 1996.Originallypublished as D 2664 67.Last
16、 previous edition D 2664 86(1995).2Annual Book of ASTM Standards,Vol 04.08.3Annual Book of ASTM Standards,Vols 03.01,14.02.4Annual Book of ASTM Standards,Vol 14.02.5Assembly and detail drawings of an apparatus that meets these requirementsand which is designed to accommodate 218-in.(53.975-mm)diameter specimensand operate at a lateral fluid pressure of 10 000 psi(689 MPa)are available fromHeadquarters.Request Adjunct No.12-426640-00.1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,
