ASTM_D_3080_-_D_3080M_-_11.pdf

Designation:D3080/D3080M11Standard Test Method forDirect Shear Test of Soils Under Consolidated DrainedConditions1This standard is issued under the fixed designation D3080/D3080M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the determination of the con-solidated drained shear strength of one specimen of a soilmaterial under direct shear boundary conditions.The specimenis deformed at a controlled rate on or near a single shear planedetermined by the configuration of the apparatus.1.2 Shear stresses and displacements are nonuniformly dis-tributed within the specimen.An appropriate height cannot bedefined for calculation of shear strains.Therefore,stress-strainrelationships or any associated quantity such as the shearmodulus,cannot be determined from this test.1.3 The determination of strength envelopes and the devel-opment of criteria to interpret and evaluate test results are leftto the engineer or office requesting the test.1.4 The results of the test may be affected by the presence ofcoarse-grained soil or rock particles,or both,(see Section 7).1.5 Test conditions,including normal stress and moistureenvironment,should be selected to represent the field condi-tions being investigated.The rate of shearing must be slowenough to ensure drained conditions.1.6 Generally,three or more tests are performed on speci-mens from one soil sample,each under a different normal load,to determine the effects upon shear resistance and displace-ment.Results from a test series are combined to determinestrength properties such as Mohr strength envelopes.Interpre-tation of multiple tests requires engineering judgment and isbeyond the scope of this test method.This test method pertainsto the requirements for a single test.1.7 There may be instances when the gap between the shearbox halves should be increased to accommodate sand sizedparticles greater than the specified gap.Presently there isinsufficient information available for specifying the gap dimen-sion based on particle size distribution.1.8 UnitsThe values stated in either inch-pound units orSI units given in brackets are to be regarded separately asstandard.The values stated in each system may not be exactequivalents;therefore,each system shall be used independentlyof the other.Combining values from the two systems mayresult in non-conformance with the standard.1.8.1 The gravitational system of inch-pound units is used.In this system,the pound(lbf)represents a unit of force(weight),while the unit for mass is slugs.The slug unit is notgiven,unless dynamic(F=ma)calculations are involved.1.9 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.9.1 The method used to specify how data are collected,calculated,or recorded in this standard is not directly related tothe accuracy to which the data can be applied in design or otheruses,or both.How one applies the results obtained using thisstandard is beyond its scope.1.10 This standard does not purport to address 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:2D422 Test Method for Particle-Size Analysis of SoilsD653 Terminology Relating to Soil,Rock,and ContainedFluidsD698 Test Methods for Laboratory Compaction Character-istics of Soil Using Standard Effort(12 400 ft-lbf/ft3(600kN-m/m3)D1557 Test Methods for Laboratory Compaction Character-istics of Soil Using Modified Effort(56,000 ft-lbf/ft3(2,700 kN-m/m3)1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.05 on Strength andCompressibility of Soils.Current edition approved Nov.1,2011.Published January 2012.Originallyapproved in 1972.Last previous edition approved in 2004 as D308004.DOI:10.1520/D3080_D3080M-11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 D1587 Practice for Thin-Walled Tube Sampling of Soils forGeotechnical PurposesD2216 Test Methods for Laboratory Determination of Water(Moisture)Content of Soil and Rock by MassD2435 Test Methods for One-Dimensional ConsolidationProperties of Soils Using Incremental LoadingD2487 Practice for Classification of S