1、Designation:D526207(Reapproved 2012)Standard Test Method forEvaluating the Unconfined Tension Creep and CreepRupture Behavior of Geosynthetics1This standard is issued under the fixed designation D5262;the number immediately following the designation indicates the year oforiginal adoption or,in the c
2、ase of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method is intended for use in determining theunconfined tension creep and creep ruptu
3、re behavior of geo-synthetics at constant temperature when subjected to a sus-tained tensile loading.This test method is applicable to allgeosynthetics.1.2 The test method measures total elongation of the geo-synthetic test specimen,from the time of loading,while beingmaintained at a constant temper
4、ature.It includes proceduresfor measuring the tension creep and creep rupture behavior atconstant temperature of conditioned geosynthetics as well asdirections for calculating tension creep and creep rupturecurves.1.3 The values stated in SI units are to be regarded as thestandard.The values given i
5、n parentheses are for informationonly.1.4 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 determine the applica-bility of regulatory limit
6、ations prior to use.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD2990 Test Methods for Tensile,Compressive,and FlexuralCreep and Creep-Rupture of PlasticsD4354 Practice for Sampling of Geosynthetics and RolledEros
7、ion Control Products(RECPs)for TestingD4439 Terminology for GeosyntheticsD4491 Test Methods for Water Permeability of Geotextilesby PermittivityD4595 Test Method for Tensile Properties of Geotextiles bythe Wide-Width Strip MethodD6637 Test Method for Determining Tensile Properties ofGeogrids by the
8、Single or Multi-Rib Tensile MethodE6 Terminology Relating to Methods of Mechanical Testing3.Terminology3.1 DefinitionsFor definitions of many terms used in thistest method,refer to Terminologies D123,D4439 and E6.3.2 Definitions of Terms Specific to This Standard:3.2.1 atmosphere for testing geosynt
9、hetics,nair main-tained at a relative humidity between 50 and 70%and the test(Section 10.2).3.2.2 creep,nthe time-dependent increase in accumulativestrain in a material resulting from an applied constant force.3.2.3 design load,nthe load at which the geosynthetic isrequired to operate in order to pe
10、rform its intended function.3.2.4 failure,nan arbitrary point at which a materialceases to be functionally capable of its intended use.3.2.5 geogrid,na geosynthetic formed by a regular net-work of integrally connected elements with apertures greaterthan 6.35 mm(14in.)to allow interlocking with surro
11、undingsoil,rock,earth,and other surrounding materials to functionprimarily as reinforcement.3.2.6 geomembrane,nan essentially impermeable geosyn-thetic composed of one or more synthetic sheets.3.2.6.1 DiscussionIn geotechnical engineering,essen-tially impermeable means that no measurable liquid flow
12、sthrough a geosynthetic when tested in accordance with TestMethods D4491.3.2.7 geosynthetic,na planar product manufactured frompolymeric material used with soil,rock,earth,or other geo-technical engineering-related material as an integral part of aman-made project,structure,or system.3.2.8 geotextil
13、e,na permeable geosynthetic comprisedsolely of textiles.3.2.8.1 DiscussionCurrent manufacturing techniques pro-duce nonwoven fabrics,knitted(non-tubular)fabrics,andwoven fabrics.1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subc
14、ommittee D35.02 on Endur-ance Properties.Current edition approved July 1,2012.Published July 2012.Originally approvedin 1992.Last previous edition approved in 2007 as D5262 07.DOI:10.1520/D5262-07R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service a
15、t serviceastm.org.For Annual Book of ASTMStandardsvolume information,refer to the standardss Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.9 index test,na test procedure that may contain akno
16、wn bias,but that may be used to establish an order for a setof specimens with respect to the property being measured.3.2.10 rate of creep,nthe slope of the creep-time curve ata given time.3.2.11 tensile creep rupture strength,FL1,nforgeosynthetics,the force per unit width that will produce failureby rupture in a creep test in a given time,at a specified constantenvironment.3.2.12 tensile creep strain,nthe total strain at any giventime.3.2.13 wide strip tensile test,nfor geosynthetics,a tensilete