ASTM_D_4767_-_11_2020.pdf

Designation:D476711(Reapproved 2020)Standard Test Method forConsolidated Undrained Triaxial Compression Test forCohesive Soils1This standard is issued under the fixed designation D4767;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of strengthand stress-strain relationships of a cylindrical specimen ofeither an intact,reconstituted,or remolded saturated cohesivesoil.Specimens are isotropically consolidated and sheared incompression without drainage at a constant rate of axialdeformation(strain controlled).1.2 This test method provides for the calculation of total andeffective stresses,and axial compression by measurement ofaxial load,axial deformation,and pore-water pressure.1.3 This test method provides data useful in determiningstrength and deformation properties of cohesive soils such asMohr strength envelopes and Youngs modulus.Generally,three specimens are tested at different effective consolidationstresses to define a strength envelope.1.4 The determination of strength envelopes and the devel-opment of relationships to aid in interpreting and evaluatingtest results are beyond the scope of this test method and mustbe performed by a qualified,experienced professional.1.5 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.5.1 The methods used to specify how data are collected,calculated,or recorded in this standard are regarded as theindustry standard.In addition,they are representative of thesignificant digits that generally should be retained.The proce-dures used do not consider material variation,purpose forobtaining the data,special purpose studies or any considerationof end use.It is beyond the scope of this test method toconsider significant digits used in analysis methods for engi-neering design.1.6 UnitsThe values stated in SI units are to be regardedas standard.The values given in parentheses are provided forinformation only and are not considered standard.Reporting oftest results in units other than SI shall not be regarded asnonconformance with this test method.1.6.1 The gravitational system of inch-pound units is usedwhen dealing with inch-pound units.In this system,the pound(lbf)represents a unit of force(weight),while the unit for massis slugs.The slug unit is not given,unless dynamic(F=ma)calculations are involved.1.6.2 It is common practice in the engineering/constructionprofession to concurrently use pounds to represent both a unitof mass(lbm)and of force(lbf).This implicitly combines twoseparate systems of units;that is,the absolute system and thegravitational system.It is scientifically undesirable to combinethe use of two separate sets of inch-pound units within a singlestandard.As stated,this standard includes the gravitationalsystem of inch-pound units and does not use/present the slugunit for mass.However,the use of balances or scales recordingpounds of mass(lbm)or recording density in lbm/ft3shall notbe regarded as nonconformance with this standard.1.6.3 The terms density and unit weight are often usedinterchangeably.Density is mass per unit volume whereas unitweight is force per unit volume.In this standard density isgiven only in SI units.After the density has been determined,the unit weight is calculated in SI or inch-pound units,or both.1.7 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:21This 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 April 1,2020.Published April 2020.Originallyapproved in 1988.Last previous edition approved in 2011 as D476711.DOI:10.1520/D4767-11R20.2For 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.Unit