1、Designation:D494512Standard 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.Scope1.1 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.High-strain dynamic testingapplies to any deep foundation unit,also referred to herein asa“pile,”which functions in a m
4、anner similar to a driven pile ora cast-in-place pile regardless of the method of installation,andwhich conforms with the requirements of this test method.1.2 This standard provides minimum requirements for dy-namic testing of deep foundations.Plans,specifications,orprovisions(or combinations thereo
5、f)prepared by a qualifiedengineer may provide additional requirements and proceduresas needed to satisfy the objectives of a particular test program.The engineer in responsible charge of the foundation design,referred to herein as the“Engineer”,shall approve anydeviations,deletions,or additions to t
6、he requirements of thisstandard.1.3 The proper conduct and evaluation of high-strain dy-namic tests requires special knowledge and experience.Aqualified engineer should directly supervise the acquisition offield data and the interpretation of the test results so as topredict the actual performance a
7、nd adequacy of deep founda-tions used in the constructed foundation.A qualified engineershall approve the apparatus used for applying the impact force,driving appurtenances,test rigging,hoist equipment,supportframes,templates,and test procedures.1.4 The text of this standard references notes and foo
8、tnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.The word“shall”indicates amandatory provision,and the word“should”indicates arecommended or advisory provision.Imperative sentencesindicate
9、mandatory provisions.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.7 The method used t
10、o 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.1.8 This standard does not purport to address al
11、l 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.For a specificprecautionary statement,see Note 4.2.Referenced Docu
12、ments2.1 ASTM Standards:2C469 Test Method for Static Modulus of Elasticity andPoissons Ratio of Concrete in CompressionD198 Test Methods of Static Tests of Lumber in StructuralSizesD653 Terminology Relating to Soil,Rock,and ContainedFluidsD1143/D1143M Test Methods for Deep Foundations UnderStatic Ax
13、ial Compressive LoadD3689 Test Methods for Deep Foundations Under StaticAxial Tensile LoadD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD6026 Practice for Using Significant Digits in Geotechnical
14、Data3.Terminology3.1 DefinitionsFor common definitions of terms used inthis standard,see Terminology D653.1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.11 on Deep Foundations.Current edition approved May 1,2012.P
15、ublished June 2012.Originallyapproved in 1989.Last previous edition approved in 2008 as D4945 08.DOI:10.1520/D4945-12.2For 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
16、 standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2 Definitions of Terms Specific to This Standard:3.2.1 cast in-place pile,na deep foundation unit made ofcement grout or concrete and constructed in its final location,for example,drilled shafts,bored piles,caissons,auger castpiles,pressure-injected footings,etc.3.2.2 deep foundation,na relatively slender structuralelement that transm
