ASTM D5780-2010 8125 Standard Test Method for Individual Piles in Permafrost Under Static Axial Compressive Load《承受静力轴向压力载荷的永冻层中的单桩的标准试验方法》.pdf
《ASTM D5780-2010 8125 Standard Test Method for Individual Piles in Permafrost Under Static Axial Compressive Load《承受静力轴向压力载荷的永冻层中的单桩的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D5780-2010 8125 Standard Test Method for Individual Piles in Permafrost Under Static Axial Compressive Load《承受静力轴向压力载荷的永冻层中的单桩的标准试验方法》.pdf(15页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D5780 10Standard 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
2、last 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 per
3、mit the introduction 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 t
4、o establish 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
5、 perma-frost that function in a manner similar to piles regardless oftheir method of installation. This standard is divided into thefollowing sections:SectionReferenced Documents 2Terminology 3Significance and Use 4Installation of Test Piles 5Apparatus for Applying Loads 6Apparatus for Measuring Mov
6、ements 7Safety Requirements 8Loading Procedures 9Standard Test Procedures 10Procedures for Measuring Pile Movements 11Report 12Precision and Bias 13Keywords 14NOTE 1Apparatus and procedures designated “optional” are to berequired only when included in the project specifications or if notspecified, m
7、ay be used only with the approval 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 a
8、re explanatory or advisory.NOTE 2This standard 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
9、 interpret the testresults for predicting 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 met
10、hodcombining the results from loading three 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
11、calculated values shall conform to theguide for 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 thesignifica
12、nt 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 becomme
13、nsurate with these considerations. It is beyond the scopeof this standard to consider significant digits used in analysismethods for engineering design.1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.19 on Frozen S
14、oils andRock.Current edition approved Feb. 1, 2010. Published March 2010. Originallyapproved in 1995. Last previous edition approved in 2002 as . DOI: 10.1520/D5780-10.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700,
15、 West Conshohocken, PA 19428-2959, United States.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 units are to be regardedas the standard, except as not
16、ed below. The values given inparentheses are mathematical conversions to SI units, whichare provided for information only and are not consideredstandard.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 f
17、orce (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 given in parentheses.1.4.3 It is c
18、ommon practice in the engineering/constructionprofession, in the United States, to concurrently use pounds torepresent both a unit of mass (lbm) and of force (lbf). Thisimplicitly combines two separate systems of units: that is, theabsolute system and the gravitational system. It is scientificallyun
19、desirable to combine the use of two separate sets ofinch-pound units within a single standard. As stated, thisstandard includes the gravitational system of inch-pound unitsand does not use/present the slug unit for mass. However, theuse of balances or scales recording pounds of mass (lbm) orrecordin
20、g density in lbm/ft3) shall not be regarded as noncon-formance with this standard.1.5 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 and health practices and d
21、etermine the applica-bility of regulatory limitations prior to use. Specific precau-tionary statements are given in Section 8.2. Referenced Documents2.1 ASTM Standards:2D653 Terminology Relating to Soil, Rock, and ContainedFluidsD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing
22、and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD6026 Practice for Using Significant Digits in GeotechnicalDataD7099 Terminology Relating to Frozen Soil and Rock2.2 ANSI Standard:3B 30.1 Safety Code for Jacks3. Terminology3.1 Definitions:3.1.1 For definitions of terms
23、 relating to soil and rockmechanics refer to Terminology D653.3.1.2 For definitions for terms related to frozen ground referto Terminology D7099.3.2 Definitions of Terms Specific to This Standard:3.2.1 adfreeze bond strengththe strength of the bonddeveloped between frozen soil and the surface of the
24、 pile.3.2.2 base loada load equivalent to the design loadadjusted for test pile geometry and expected ground tempera-ture.3.2.3 creep loadthat load applied to measure a rate ofdisplacement.3.2.4 creep load incrementan incremental load applied toa pile to determine the rate of displacement at 10 % of
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