1、Designation:D578010Standard Test Methods forIndividual Piles in Permafrost Under Static AxialCompressive Load1This standard is issued under the fixed designation D5780;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last
2、revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONThese test methods have been prepared to cover methods of axial load testing of piles in permafrost.The provisions permit the i
3、ntroduction of more detailed requirements and procedures when requiredto satisfy the objectives of the test program.The procedures herein produce a relationship betweenapplied load and pile settlement for conditions of ground temperature at the time of test.The resultsmay be interpreted to establish
4、 long-term load capacity of piles in permafrost.1.Scope*1.1 These test methods cover procedures for testing indi-vidual vertical piles to determine response of the pile to staticcompressive load applied axially to the pile.These testmethods are applicable to all deep foundation units in perma-frost
5、that function in a manner similar to piles regardless oftheir method of installation.This standard is divided into thefollowing sections:SectionReferenced Documents2Terminology3Significance and Use4Installation of Test Piles5Apparatus for Applying Loads6Apparatus for Measuring Movements7Safety Requi
6、rements8Loading Procedures9Standard Test Procedures10Procedures for Measuring Pile Movements11Report12Precision and Bias13Keywords14NOTE1Apparatus and procedures designated“optional”are to berequired only when included in the project specifications or if notspecified,may be used only with the approv
7、al of the engineer responsiblefor the foundation design.The word“shall”indicates a mandatoryprovision and“should”indicates a recommended or advisory provision.Imperative sentences indicate mandatory provisions.Notes,illustrations,and appendixes included herein are explanatory or advisory.NOTE2This s
8、tandard does not include the interpretation of test resultsor the application of test results to foundation design.See Appendix X1for comments regarding some of the factors influencing the interpretationof test results.A qualified geotechnical engineer should interpret the testresults for predicting
9、 pile performance and capacity.1.2 Three different test methods are included within thisstandard.Method A is the standard method combining theresults from loading two separate piles with the possibility ofa third alternate pile.Method B is the alternate methodcombining the results from loading three
10、 separate piles with thepossibility of a fourth alternate pile.Method C is a confirma-tion method requiring the testing of one pile with the possibil-ity of a second alternate.Method C is applicable only whereprior data are available.1.3 All recorded and calculated values shall conform to theguide f
11、or significant digits and rounding established in PracticeD6026.1.3.1 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
12、 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 s
13、copeof this standard to consider significant digits used in analysismethods for engineering design.1.3.2 Measurements made to more significant digits orbetter sensitivity than specified in this standard shall not beregarded a nonconformance with this standard.1.4 The values stated in inch-pound unit
14、s are to be regardedas the standard,except as noted below.The values given inparentheses are mathematical conversions to SI units,whichare provided for information only and are not consideredstandard.1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct r
15、esponsibility of Subcommittee D18.19 on Frozen Soils andRock.Current edition approved Feb.1,2010.Published March 2010.Originallyapproved in 1995.Last previous edition approved in 2002 as D5780 95(2002).DOI:10.1520/D5780-10.*A Summary of Changes section appears at the end of this standardCopyright AS
16、TM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 1.4.1 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 the slug.1.4.2 The slug unit of mass is almost never used incommercial practice.Therefore,the standard unit for mass inthis standard is either kilogram(kg)or gram(g),or both.Theequivalent inch-pound unit(slug)is not giv
