ASTM D1143 D1143M-2007(2013) Standard Test Methods for Deep Foundations Under Static Axial Compressive Load《静态轴向压力载荷下深地基的标准试验方法》.pdf

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1、Designation: D1143/D1143M 07 (Reapproved 2013)Standard Test Methods forDeep Foundations Under Static Axial Compressive Load1This standard is issued under the fixed designation D1143/D1143M; the number immediately following the designation indicates theyear of original adoption or, in the case of rev

2、ision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 The test methods d

3、escribed in this standard measure theaxial deflection of a vertical or inclined deep foundation whenloaded in static axial compression. These methods apply to alldeep foundations, referred to herein as piles, that function in amanner similar to driven piles or cast-in-place piles, regardlessof their

4、 method of installation, and may be used for testingsingle piles or pile groups. The test results may not representthe long-term performance of a deep foundation.1.2 This standard provides minimum requirements for test-ing deep foundations under static axial compressive load.Plans, specifications, a

5、nd/or provisions 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,

6、or additions to the requirements of thisstandard.1.3 This standard allows the following test procedures:Procedure A Quick Test 8.1.2Procedure B Maintained Test (Optional) 8.1.3Procedure C Loading in Excess of Maintained Test (Optional) 8.1.4Procedure D Constant Time Interval Test (Optional) 8.1.5Pro

7、cedure E Constant Rate of Penetration Test (Optional) 8.1.6Procedure F Constant Movement Increment Test (Optional) 8.1.7Procedure G Cyclic Loading Test (Optional) 8.1.81.4 Apparatus and procedures herein designated “optional”may produce different test results and may be used only whenapproved by the

8、 Engineer. The word “shall” indicates amandatory provision, and the word “should” indicates arecommended or advisory provision. Imperative sentencesindicate mandatory provisions.1.5 A qualified geotechnical engineer should interpret thetest results obtained from the procedures of this standard so as

9、to predict the actual performance and adequacy of piles used inthe constructed foundation. See Appendix X1 for commentsregarding some of the factors influencing the interpretation oftest results.1.6 A qualified engineer shall design and approve all load-ing apparatus, loaded members, support frames,

10、 and testprocedures. The text of this standard references notes andfootnotes which provide explanatory material. These notes andfootnotes (excluding those in tables and figures) shall not beconsidered as requirements of the standard. This standard alsoincludes illustrations and appendices intended o

11、nly for ex-planatory or advisory use.1.7 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two syste

12、ms may result in non-conformancewith the standard.1.8 The gravitational system of inch-pound units is usedwhen dealing with inch-pound units. In this system, the poundlbf represents a unit of force weight, while the unit for massis slugs. The rationalized slug unit is not given, unless dynamicF=ma c

13、alculations are involved.1.9 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.10 The method used to specify how data are collected,calculated, or recorded in this standard is not directly related tothe accuracy to wh

14、ich the data can be applied in design or otheruses, or both. How one applies the results obtained using thisstandard is beyond its scope.1.11 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

15、establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D653 Terminology Relating to Soil, Rock, and ContainedFluids1This test method is under the jurisdiction ofASTM Committee D18 on Soil a

16、ndRock and is the direct responsibility of Subcommittee D18.11 on Deep Foundations.Current edition approved June 15, 2013. Published July 2013. Originallyapproved in 1950. Last previous edition approved in 2007 as D1143 071. DOI:10.1520/D1143_D1143M-07R13.2For referenced ASTM standards, visit the AS

17、TM 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.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. Unite

18、d States1D3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD5882 Test Method for Low Strain Impact Integrity Testingof Deep FoundationsD6026 Practice for Using Significant Digits in GeotechnicalDataD

19、6760 Test Method for Integrity Testing of Concrete DeepFoundations by Ultrasonic Crosshole Testing2.2 American National Standards:3ASME B30.1 JacksASME B40.100 Pressure Gages and Gauge AttachmentsASME B89.1.10.M Dial Indicators (For Linear Measure-ments)3. Terminology3.1 DefinitionsFor common defini

20、tions of terms used inthis standard, see Terminology D653.3.2 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, pr

21、essure-injected footings, etc3.2.2 deep foundation, n a relatively slender structuralelement that transmits some or all of the load it supports to soilor rock well below the ground surface, such as a steel pipe pileor concrete drilled shaft3.2.3 driven pile, na deep foundation unit made of pre-forme

22、d material with a predetermined shape and size andtypically installed by impact hammering, vibrating, or pushing.3.2.4 failure load, nfor the purpose of terminating an axialcompressive load test, the test load at which rapid continuing,progressive movement occurs, or at which the total axialmovement

23、 exceeds 15 % of the pile diameter or width, or asspecified by the engineer.3.2.5 telltale rod, nan unstrained metal rod extendedthrough the test pile from a specific point to be used as areference from which to measure the change in the length ofthe loaded pile.3.2.6 wireline, na steel wire mounted

24、 with a constanttension force between two supports and used as a reference lineto read a scale indicating movement of the test pile.4. Significance and Use4.1 Field tests provide the most reliable relationship be-tween the axial load applied to a deep foundation and theresulting axial movement. Test

25、 results may also provideinformation used to assess the distribution of side shearresistance along the pile shaft, the amount of end bearingdeveloped at the pile toe, and the long-term load-deflectionbehavior.Afoundation designer may evaluate the test results todetermine if, after applying an approp

26、riate factor of safety, thepile or pile group has an ultimate static capacity and adeflection at service load satisfactory to support a specificfoundation. When performed as part of a multiple-pile testprogram, the designer may also use the results to assess theviability of different piling types an

27、d the variability of the testsite.4.2 If feasible, without exceeding the safe structural load onthe pile(s) or pile cap, the maximum load applied should reacha failure load from which the Engineer may determine theultimate axial static compressive load capacity of the pile(s).Tests that achieve a fa

28、ilure load may help the designer improvethe efficiency of the foundation by reducing the piling length,quantity, or size.4.3 If deemed impractical to apply axial test loads to aninclined pile, the Engineer may elect to use axial test resultsfrom a nearby vertical pile to evaluate the axial capacity

29、of theinclined pile.NOTE 1The quality of the result produced by this test method isdependent on the competence of the personnel performing it, and thesuitability of the equipment and facilities used. Agencies that meet thecriteria of Practice D3740 are generally considered capable of competentand ob

30、jective testing/sampling/ inspection/etc. Users of this test methodare cautioned that compliance with Practice D3740 does not in itselfassure reliable results. Reliable results depend on many factors; PracticeD3740 provides a means of evaluating some of those factors.5. Test Foundation Preparation5.

31、1 Excavate or add fill to the ground surface around the testpile or pile group to the final design elevation unless otherwiseapproved by the Engineer.5.2 Cut off or build up the test pile as necessary to permitconstruction of the load-application apparatus, placement ofthe necessary testing and inst

32、rumentation equipment, andobservation of the instrumentation. Remove any damaged orunsound material from the pile top and prepare the surface sothat it is perpendicular to the pile axis with minimal irregularityto provide a good bearing surface for a test plate.5.3 For tests of single piles, install

33、 a solid steel test plate atleast 25 mm 1 in. thick perpendicular to the long axis of thetest pile that covers the complete pile top area. The test plateshall span across and between any unbraced flanges on the testpile.5.4 For tests on pile groups, cap the pile group withsteel-reinforced concrete o

34、r a steel load frame designed for theanticipated loads. Provide a clear space beneath the pile cap asspecified by the Engineer to eliminate any bearing on theunderlying ground surface. For each loading point on the pilecap, provide a solid steel test plate oriented perpendicular tothe axis of the pi

35、le group with a minimum thickness of 25 mm1 in., as needed to safely apply load to the pile cap. Center asingle bearing plate on the centroid of the pile group. Locatemultiple bearing plates symmetrically about the centroid of thepile group. Boxes and beams may bear directly on the pile capwhen desi

36、gned to bear uniformly along their contact surfacewith the cap.5.5 To minimize stress concentrations due to minor irregu-larities of the pile top surface, set test plates bearing on the topof precast or cast-in-place concrete piles in a thin layer of3Available from American Society of Mechanical Eng

37、ineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org.D1143/D1143M 07 (2013)2quick-setting, non-shrink grout, less than 6 mm 0.25 in. thickand having a compressive strength greater than the test pile atthe time of the test. Set test plates, boxes

38、, and beams designedto bear on a concrete pile cap in a thin layer of quick-setting,non-shrink grout, less than 6 mm 0.25 in. thick and having acompressive strength greater than the pile cap at the time of thetest. For tests on steel piles, or a steel load frame, weld the testplate to the pile or lo

39、ad frame. For tests on individual timberpiles, set the test plate directly on the cleanly cut top of the pile,or in grout as described for concrete piles.NOTE 2Deep foundations sometimes include hidden defects that maygo unnoticed prior to the static testing. Low strain integrity tests asdescribed i

40、n D5882 and ultrasonic crosshole integrity tests as described inD6760 may provide a useful pre-test evaluation of the test foundation.6. Apparatus for Applying and Measuring Loads6.1 General:6.1.1 The apparatus for applying compressive loads to a testpile or pile group shall conform to one of the me

41、thodsdescribed in 6.36.6 Unless otherwise specified by theEngineer, the apparatus for applying and measuring loadsdescribed in this section shall be capable of safely applying atleast 120 % of the maximum anticipated test load. Use themethod described in 6.3 to apply axial loads to either verticalor

42、 inclined piles or pile groups. Use the methods described in6.4-6.6 to apply only vertical loads.6.1.2 Align the test load apparatus with the longitudinal axisof the pile or pile group to minimize eccentric loading. Whennecessary to prevent lateral deflection and buckling along theunsupported pile l

43、ength, provide lateral braces that do notinfluence the axial movement of the pile, or pile cap.6.1.3 Each jack shall include a hemispherical bearing orsimilar device to minimize lateral loading of the pile or group.The hemispherical bearing should include a locking mecha-nism for safe handling and s

44、etup. Center bearing plates,hydraulic jack(s), load cell(s), and hemispherical bearings onthe test beam(s), test pile, or test pile cap.6.1.4 Provide bearing stiffeners as needed between theflanges of test and reaction beams. Provide steel bearing platesas needed to spread the load from the outer pe

45、rimeter of thejack(s), or the bearing surface of beams or boxes, to bear on thesurface of the test pile or pile cap. Also provide steel bearingplates to spread the load between the jack(s), load cells, andhemispherical bearings, and to spread the load to the testbeam(s), test pile, or pile cap. Bear

46、ing plates shall extend thefull flange width of steel beams and the complete top area ofpiles, or as specified by the Engineer, so as to provide fullbearing and distribution of the load.6.1.5 Unless otherwise specified, provide steel bearingplates that have a total thickness adequate to spread the b

47、earingload between the outer perimeters of loaded surfaces at amaximum angle of 45 to the loaded axis. For center holejacks and center hole load cells, also provide steel platesadequate to spread the load from their inner diameter to thetheir central axis at a maximum angle of 45 , or per manu-factu

48、rer recommendations. Bearing plates shall extend the fullwidth of the test beam(s) or any steel reaction members so asto provide full bearing and distribution of the load.6.1.6 A qualified engineer shall design and approve allloading apparatus, loaded members, support frames, and load-ing procedures

49、. The test beam(s), load platforms, and supportstructures shall have sufficient size, strength, and stiffness toprevent excessive deflection and instability up to the maximumanticipated test load.NOTE 3Rotations and lateral displacements of the test pile or pile capmay occur during loading, especially for piles extending above the soilsurface or through weak soils. Design and construct the support reactionsto resist any undesirable rotations or lateral displacements6.2 Hydraulic Jacks, Gages, Transducers, and Load Cells:6.2.1 The hydraulic jack(s) and t