1、Designation:D6574/D6574M131Standard Test Method forDetermining the(In-Plane)Hydraulic Transmissivity of aGeosynthetic by Radial Flow1This standard is issued under the fixed designation D6574/D6574M;the number immediately following the designation indicates theyear of original adoption or,in the case
2、 of revision,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.1NOTETable 1 was editorially inserted in Section 11.3 in March 2014.1.Scope1.1 This test method covers the pr
3、ocedure for determiningthe in-plane transmissivity of geosynthetics under varyingnormal compressive stresses using a radial flow apparatus.Thetest is intended to be an index test used primarily forgeotextiles,although other products composed of geotextilesand geotextile-type materials may be suitabl
4、e for testing withthis test method.1.2 This test method is based on the assumption that thetransmissivity of the geosynthetic is independent of orientationof the flow and is therefore limited to geosynthetics that havesimilar transmissivity in all directions and should not be usedfor materials with
5、oriented flow behavior.1.3 This test method has been developed specifically forgeosynthetics that have transmissivity values on the order of orless than 2 104m2/s.Consider using Test Method D4716 forgeosynthetics with transmissivity values higher than 2 104m2/s.1.4 The values stated in either SI uni
6、ts 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 systems may result in non-conformancewith the standard.1.5 This standard does not pu
7、rport 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 limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D4354
8、 Practice for Sampling of Geosynthetics and RolledErosion Control Products(RECPs)for TestingD4439 Terminology for GeosyntheticsD4716 Test Method for Determining the(In-plane)FlowRate per Unit Width and Hydraulic Transmissivity of aGeosynthetic Using a Constant HeadD5092 Practice for Design and Insta
9、llation of GroundwaterMonitoring Wells3.Terminology3.1 For definitions of terms relating to geosynthetics,referto Terminology D4439.3.2 Definitions:3.2.1 geosynthetic,na planar product manufactured frompolymeric material used with soil,rock,earth,or other geo-technical engineering related material a
10、s an integral part of aman-made project,structure,or system.D44393.2.2 geotextile,na permeable geosynthetic comprisedsolely of textiles.D44393.2.3 gravity flow,nflow in a direction parallel to theplane of a geosynthetic driven predominantly by a difference inelevation between the inlet and outflow p
11、oints of a specimen.D44393.2.3.1 DiscussionThe pressure at the outflow is consid-ered to be atmospheric.3.2.4 head(static),nthe height above a standard datum ofthe surface of a column of water(or other liquid)that can besupported by a static pressure at a given point.The static headis the sum of the
12、 elevation head and the pressure head.D50921This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.03 on Perme-ability and Filtration.Current edition approved July 1,2013.Published July 2013.Originally approvedin 2000.Las
13、t previous edition approved in 2011 as D6574 00(2011).DOI:10.1520/D6574_D6574M-13E01.2For 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 standards Document Summary page
14、onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.5 hydraulic gradient,i,s(D),nthe loss of hydraulichead per unit distance of flow,dH/dL.D44393.2.5.1 DiscussionThe gradient is not constant from pointto point in the di
15、rection of flow in the radial flow test.Thegradient(mathematically)varies with the inverse of the radialdistance from the center.3.2.6 hydraulic transmissivity,(L2T1),nfor ageosynthetic,the volumetric flow rate per unit width ofspecimen per unit gradient in a direction parallel to the plane ofthe sp
16、ecimen.D44393.2.6.1 DiscussionTransmissivity is technically appli-cable only to saturated laminar flow hydraulic conditions.3.2.7 index test,na test procedure,which may contain aknown bias but which may be used to establish an order for aset of specimens with respect to the property of interest.D44393.2.8 in-plane flow,nfluid flow confined to a directionparallel to the plane of a geosynthetic.D44393.2.9 laminar flow,nflow in which the head loss isproportional to the first power of the velocity.D
