1、Designation:D285015Standard Test Method forUnconsolidated-Undrained Triaxial Compression Test onCohesive Soils1This standard is issued under the fixed designation D2850;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last
2、 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 determination of the strengthand stress-strain relationships of a cylindrical specimen ofeither intact
3、,compacted,or remolded cohesive soil.Specimensare subjected to a confining fluid pressure in a triaxial chamber.No drainage of the specimen is permitted during the applica-tion of the confining fluid pressure or during the compressionphase of the test.The specimen is axially loaded at a constantrate
4、 of axial deformation(strain controlled).1.2 This test method provides data for determiningundrained strength properties and stress-strain relations forsoils.This test method provides for the measurement of thetotal stresses applied to the specimen,that is,the stresses arenot corrected for pore-wate
5、r pressure.NOTE1The determination of the unconfined compressive strength ofcohesive soils is covered by Test Method D2166/D2166M.NOTE2The determination of the consolidated,undrained strength ofcohesive soils with pore pressure measurement is covered by Test MethodD4767.1.3 All observed and calculate
6、d values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.3.1 The procedures used to specify how data are collected/recorded or calculated in this standard are regarded as theindustry standard.In addition,they are representative of thesignificant digi
7、ts that generally should 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 common practice toincrease or reduce significant digits of reported data to becommensurate with
8、 these considerations.It is beyond the scopeof this standard to consider significant digits used in analysismethods for engineering design.1.4 UnitsThe values stated in SI units are to be regardedas the standard.The values given in parentheses are mathemati-cal conversions to inch-pound units,which
9、are provided forinformation only and are not considered standard.Reporting oftest results in units other than SI shall not be regarded asnonconformance with this test method.1.4.1 The converted inch-pound units use the gravitationalsystem of units.In this system,the pound(lbf)represents a unitof for
10、ce(weight),while the unit for mass is slugs.The slug unitis not given,unless dynamic(F=ma)calculations areinvolved.1.5 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 saf
11、ety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D422 Test Method for Particle-Size Analysis of SoilsD653 Terminology Relating to Soil,Rock,and ContainedFluidsD854 Test Methods for Specific Gravity of Soil Soli
12、ds byWater PycnometerD1587 Practice for Thin-Walled Tube Sampling of Soils forGeotechnical PurposesD2166/D2166M Test Method for Unconfined CompressiveStrength of Cohesive SoilD2216 Test Methods for Laboratory Determination of Water(Moisture)Content of Soil and Rock by MassD2487 Practice for Classifi
13、cation of Soils for EngineeringPurposes(Unified Soil Classification System)D2488 Practice for Description and Identification of Soils(Visual-Manual Procedure)D3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and Con
14、structionD4220/D4220M Practices for Preserving and TransportingSoil Samples1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.05 on Strength andCompressibility of Soils.Current edition approved Nov.15,2015.Published D
15、ecember 2015.Originallyapproved in 1970.Last previous edition approved in 2007 as D2850 03a(2007).DOI:10.1520/D2850-15.2For referenced ASTM Standards,visit the ASTM website,www.astm.org,orcontact Customer Service at serviceastm.org.For Annual Book of ASTM Stan-dardsvolume information,refer to the st
16、andards Document Summary page on theASTM website.*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 D4318 Test Methods for Liquid Limit,Plastic Limit,andPlasticity Index of SoilsD4753 Guide for Evaluating,Selecting,and Specifying Bal-ances and Standard Masses for Use in Soil,Rock,andConstruction Materials TestingD4767 Test Method for Consolidated Undrained TriaxialCompressi
