1、Designation:D451111(Reapproved 2020)Standard Test Method forHydraulic Conductivity of Essentially Saturated Peat1This standard is issued under the fixed designation D4511;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of la
2、st revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the determination of the hy-draulic conductivity(permeability)of essentially saturated,intact cylind
3、rical specimens of peat when the hydraulic con-ductivity is greater than 1 107m/s(1 105cm/s).Duringthe test,the specimens are contained in the core holder,or inright,regular cylindrical sections cut from the sampling tube inwhich they were originally obtained in the field.1.2 Hydraulic conductivity
4、is calculated on the basis of themeasured constant flow rate through the specimen underconstant head.2For verification,flow rate determinations maybe made at two or more values of constant head withcorresponding calculations of hydraulic conductivity.1.3 UnitsThe values stated in SI units are to be
5、regardedas standard.The values given in parentheses are provided forinformation only and are not considered standard.1.3.1 The converted inch-pound units use the gravitationalsystem of units.In this system,the pound(lbf)represents a unitof force(weight),while the unit for mass is slugs.Theconverted
6、slug unit is not given,unless dynamic(F=ma)calculations are involved.1.4 All observed and calculated values shall conform to theguide for significant digits and rounding established in PracticeD6026.1.4.1 The procedures used to specify how data are collected/recorded and calculated in this standard
7、are regarded as theindustry standard.In addition,they are representative of thesignificant 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
8、common practice toincrease or reduce significant digits of reported data to becommensurate with these considerations.It is beyond the scopeof this standard to consider significant digits used in analysismethods for engineering design.1.5 This standard does not purport to address all of thesafety con
9、cerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with inte
10、rnationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D653 Ter
11、minology Relating to Soil,Rock,and ContainedFluidsD1587/D1587M Practice for Thin-Walled Tube Sampling ofFine-Grained Soils for Geotechnical PurposesD2434 Test Method for Permeability of Granular Soils(Constant Head)D2974 Test Methods for Moisture,Ash,and Organic Matterof Peat and Other Organic Soils
12、D3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD4220/D4220M Practices for Preserving and TransportingSoil SamplesD4753 Guide for Evaluating,Selecting,and Specifying Bal-ances and Standard Masses f
13、or Use in Soil,Rock,andConstruction Materials TestingD6026 Practice for Using Significant Digits in GeotechnicalData2.2 NRC Document:Peat Testing Manual41This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.04 on Hydrolo
14、gicProperties and Hydraulic Barriers.Current edition approved Feb.15,2020.Published March 2020.Originallyapproved in 1992.Last previous edition approved in 2011 as D451111.DOI:10.1520/D4511-11R20.2For further information,see“Methods for Measurement of Saturated HydraulicConductivity,”Peat Testing Ma
15、nual,Technical Memorandum No.125,NRCCanada,pp.8084.3For 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 onthe ASTM website.4National Resea
16、rch Council of Canada,Publications Section,Building R88,Ottawa,Canada K1A 0R6.Out of print.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations iss
