1、Designation:D494517Standard Test Method forHigh-Strain Dynamic Testing of Deep Foundations1This standard is issued under the fixed designation D4945;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number i
2、n parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This dynamic test method covers the procedure forapplying an axial impact force with a pile driving hammer ora large drop weight that will cause a
3、 relatively high strain at thetop of an individual vertical or inclined deep foundation unit,and for measuring the subsequent force and velocity responseof that deep foundation unit.While in this standard force andvelocity are referenced as“measured,”they are typicallyderived from measured strain an
4、d acceleration values.High-strain dynamic testing applies to any deep foundation unit,alsoreferred to herein as a“pile,”which functions in a mannersimilar to a driven pile or a cast-in-place pile regardless of themethod of installation,and which conforms with the require-ments of this test method.1.
5、2 This standard provides minimum requirements for dy-namic testing of deep foundations.Plans,specifications,orprovisions(or combinations thereof)prepared by a qualifiedengineer may provide additional requirements and proceduresas needed to satisfy the objectives of a particular test program.The engi
6、neer in responsible charge of the foundation design,referred to herein as the“Engineer”,shall approve anydeviations,deletions,or additions to the requirements of thisstandard.1.3 The proper conduct and evaluation of high-strain dy-namic tests requires special knowledge and experience.Aqualified engi
7、neer should directly supervise the acquisition offield data and the interpretation of the test results so as topredict the actual performance and adequacy of deep founda-tions used in the constructed foundation.A qualified engineershall approve the apparatus used for applying the impact force,drivin
8、g appurtenances,test rigging,hoist equipment,supportframes,templates,and test procedures.1.4 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 standa
9、rd.The word“shall”indicates amandatory provision,and the word“should”indicates arecommended or advisory provision.Imperative sentencesindicate mandatory provisions.1.5 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.Reportin
10、g of test results in units other than SI shallnot be regarded as nonconformance with this test method.1.6 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.6.1 The procedures used to specify how data are collected/rec
11、orded 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-atio
12、ns for the users objectives;and it is common practice toincrease or reduce significant digits of reported data to com-mensurate with these considerations.It is beyond the scope ofthis standard to consider significant digits used in analysismethods for engineering design.1.7 This standard does not pu
13、rport 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.For a specific precautionary stat
14、ement,see Note 4.1.8 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 Tech
15、nicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C469 Test Method for Static Modulus of Elasticity andPoissons Ratio of Concrete in CompressionD198 Test Methods of Static Tests of Lumber in StructuralSizes1This test method is under the jurisdiction ofASTM Committee D18
16、on Soil andRock and is the direct responsibility of Subcommittee D18.11 on Deep Foundations.Current edition approved Nov.1,2017.Published December 2017.Originallyapproved in 1989.Last previous edition approved in 2012 as D4945 12.DOI:10.1520/D4945-17.2For 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 C