ASTM_D_6598_-_11.pdf

Designation:D659811Standard Guide forInstalling and Operating Settlement Platforms for MonitoringVertical Deformations1This standard is issued under the fixed designation D6598;the number immediately following the designation indicates the year oforiginal adoption or,in the case 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.Scope*1.1 This guide provides recommended designs and proce-dures for the fabrication,installation,operation,and reading ofsettlement platform to determine the magnitude and rate offoundation,fill settlements,or both generally under a fill orembankment load.Two types of settlement platforms aredescribed those being monitored by elevation surveys froman external bench mark and those that include an internalreference system supported on unyielding soil or rock beneaththe compressible layer(s)of interest.1.2 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.1.3 This guide does not purport to address all of the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this guide to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.1.4 This guide offers an organized collection of informationor a series of options and does not recommend a specificcourse of action.This document cannot replace education orexperience and should be used in conjunction with professionaljudgement.Not all aspects of this guide may be applicable inall circumstances.This ASTM standard is not intended torepresent or replace the standard of care by which theadequacy of a given professional service must be judged,norshould this document be applied without consideration of aprojects many unique aspects.The word“standard”in thetitle of this document means only that the document has beenapproved through the ASTM consensus process.2.Referenced Documents2.1 ASTM Standards:2D653 Terminology Relating to Soil,Rock,and ContainedFluidsD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD5092 Practice for Design and Installation of GroundwaterMonitoring Wells3.Terminology3.1 Definitions:3.1.1 For definitions of terms in this standard,refer toTerminology D653.3.2 Definitions of Terms Specific to This Standard:3.2.1 settlement platforma system consisting of a squarebase platform with an extendible riser pipe of known lengthwhich is used to monitor vertical deformations at the elevationof the base platform by survey measurements made of the topof the riser pipe.3.2.2 external and internal reference point systemwith anexternal system,the amount of settlement is determined byreferencing the elevation of the settlement platform to anoutside elevation benchmark;with an internal system,theamount of settlement is determined by measuring the relativedisplacement of two co-axial riser pipes moving relative toeach other,the outer riser pipe being attached to the baseplatform and the inner riser pipe being fixed to an unyieldingstratum.3.2.3 anchoran anchor system that provides an internalfixed reference point below the base of the settlement platformsystem.3.2.4 extendible risera metal shaft or pipe which can beincrementally lengthened using sections of the same materialand appropriate couplings as fill is placed and compacted toensure that the top of the riser remains above the level of thesurrounding ground surface.Depending on whether an externalor internal reference point is being used,there may be one ortwo risers.3.2.5 isolation casinga casing of a larger diameter thanthe extendible risers is used in some installations to preventdown-drag of soil on the extendible riser that would otherwise1This guide is under the jurisdiction ofASTM Committee D18 on Soil and Rockand is the direct responsibility of Subcommittee D18.23 on Field Instrumentation.Current edition approved Nov.1,2011.Published January 2012.Originallyapproved in 2000.Last previous edition approved in 2007 as D659807.DOI:10.1520/D6598-11.2For 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 onthe ASTM 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 be in contact with the soil from placing additional load on theplatform and thereby leading to overestimates of deformations.3.2.6 For definitions of other terms used in this guide seeTerminology D653.4.Summary of Standard Guide4.1 The standard guide presents recommended designs forsettlement platforms along with procedures to install,ope