ASTM_D_4719_-_20.pdf

Designation:D471920Standard Test Methods forPrebored Pressuremeter Testing in Soils1This standard is issued under the fixed designation D4719;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.Scope*1.1 This test method covers pressuremeter testing of soils ata given depth in the ground within a suitable prebored,opentest cavity.The pressuremeter test is an in situ,stress-strain testperformed on the wall of a test cavity using a circularcylindrical probe that is expanded radially.To obtain viable testresults,disturbance of the test cavity must be minimized withminimal clearance between the diameter of the probe and thetest cavity.Alternatively,when preboring does not provide anacceptable test cavity,the probe may be directly inserted intothe ground to form the test cavity.1.2 This test method includes the procedure for test cavitypreparation,inserting the probe,and conducting pressuremetertests in both granular and cohesive soils,but does not includehigh pressure testing in rock.Knowledge of the type of soil tobe tested is necessary for assessment of(1)the method ofpreparing the test cavity,(2)the interpretation of the test data,and(3)the acceptability of the test results.1.3 This test method does not cover the self-boringpressuremeter,for which the hole is drilled by a mechanical orjetting tool inside the hollow core of the probe.This testmethod is limited to the type of pressuremeter that is insertedinto predrilled boreholes or,under certain circumstances,isinserted by driving or pushing.1.4 Two alternative testing procedures are provided asfollows:1.4.1 Procedure AEqual Pressure Increments1.4.2 Procedure BEqual Volume IncrementsNOTE1Pressuremeter tests performed in rock or using the self-boringpressuremeter follow similar test procedures to those described herein,butdo not fall within the scope of this test method.NOTE2Strain-controlled tests also can be performed,whereby theprobe volume is increased at a constant rate and corresponding pressuresare measured.Strain-controlled tests may yield different results than theprocedures described in this test method.1.5 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.6 The procedures used to specify how data are collected/recorded and calculated in this standard are regarded as theindustry standard.In addition,they are representative of thesignificant digits that should generally be retained.The proce-dures used do not consider material variation,purpose forobtaining the data,special purpose studies,or any consider-ations for the users objectives;and it is common practice toincrease or reduce significant digits of reported data to becommensurate with these considerations.It is beyond the scopeof this standard to consider significant digits used in analysismethods for engineering design.1.7 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.1.8 The values stated in SI units are to be regarded as thestandard.No other units of measurement are included in thisstandard.Reporting of test results in units other than SI shallnot be regarded as non-conformance with this test method.1.9 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.1.10 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:2D653 Terminology Relating to Soil,Rock,and ContainedFluids1These test methods are under the jurisdiction ofASTM Committee D18 on Soiland Rock and is the direct responsibility of Subcommittee D18.02 on Sampling andRelated Field Testing for Soil Evaluations.Current edition approved Jan.1,2020.Published January 2020.Originallyapproved in 1987.Last previous edition approved in 2007 as D4719 07,whichwas withdrawn January 2016 and reinstated in January 2020.DOI:10.1520/D4719-20.2For 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 standardCopy