1、Designation:D451111Standard 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 last revision.A num
2、ber 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 cylindrical specimens o
3、f 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 is calculated on
4、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 regardedas the st
5、andard.The inch-pound units given in parentheses aremathematical conversions,which are provided for informationpurposes 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
6、the unit for mass is slugs.Theconverted 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/r
7、ecorded and calculated in this standard 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-at
8、ions for the users objectives,and it is 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
9、 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 limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3D6
10、53 Terminology Relating to Soil,Rock,and ContainedFluidsD1587 Practice for Thin-Walled Tube Sampling of Soils forGeotechnical PurposesD2434 Test Method for Permeability of Granular Soils(Constant Head)D2974 Test Methods for Moisture,Ash,and Organic Matterof Peat and Other Organic SoilsD3740 Practice
11、 for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD4220 Practices for Preserving and Transporting SoilSamplesD4753 Guide for Evaluating,Selecting,and Specifying Bal-ances and Standard Masses for Use in Soil,Rock,a
12、ndConstruction Materials TestingD6026 Practice for Using Significant Digits in GeotechnicalData2.2 NRC Document:Peat Testing Manual43.Terminology3.1 DefinitionsFor common definitions of terms in thisstandard,refer to Terminology D653.3.2 Definitions of Terms Specific to This Standard:3.2.1 deaerated
13、(de-aired)waterwater in which theamount of dissolved gas(air)has been reduced.1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.04 on HydrologicProperties and Hydraulic Barriers.Current edition approved Nov.1,2011.Pu
14、blished January 2012.Originallyapproved in 1992.Last previous edition approved in 2006 as D451100(2006).DOI:10.1520/D4511-11.2For further information,see“Methods for Measurement of Saturated HydraulicConductivity,”Peat Testing Manual,Technical Memorandum No.125,NRCCanada,pp.8084.3For referenced ASTM
15、 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 Research Council of Canada,Publications Section,Building R88,Ottawa,Canada K
16、1A 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 States1 3.2.2 flow ratethe quantity of water flowing through thetest specimen in a given period of time,when subjected to acertain constant head differential.3.2.3 soakingplacement of a specimen in water for thepurpose of removing gas contained in the pore space,throughbouyancy,and replacement with water to caus
