1、Designation:D499222Standard Practice forEvaluation of Rock to be Used for Erosion Control1This standard is issued under the fixed designation D4992;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
2、 parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This practice covers the evaluation of rock to be used forerosion control.The complexity and extent of this evaluationwill be governed by the size
3、and design requirements of theindividual project,the quantity and quality of rock required,and the potential risk for property damage or loss of humanlife.1.2 It is not intended that all of the evaluations listed in thispractice be addressed for every project.For some small,lesscritical jobs,a visua
4、l inspection of the rock may be all that isnecessary.Several of the evaluations listed may be necessaryon large,complex,high-hazard projects.It is the responsibilityof the designer to determine the intensity and number ofevaluations made on any one project.1.3 Examination of the rock at the source,e
5、valuation ofsimilar rock exposed to the environment at any fieldinstallations,as well as laboratory tests may be necessary todetermine the properties of the rock as related to its predictedperformance at the site of intended use(1,2,3,4,5,6).21.4 The examination of the rock at its source is essentia
6、l toits evaluation for erosion control and aids in the planning of thesubsequent laboratory examinations.Very large pieces of rockup to several tons weight are used in the control of erosion;take great care with the field descriptions and in the samplingprogram to assure that zones of impurities or
7、weaknesses thatmight not occur in ordinary size specimens are recorded andevaluated for their deleterious potential under the conditions ofintended use.It is necessary that the intended method of rockremoval be studied to ascertain whether the samples taken willcorrespond to the blasting,handling,an
8、d weathering history ofthe rock that will finally be used(3).1.5 The specific procedures employed in the laboratoryexaminations depend on the kind of rock,its characteristics,mineral components,macro and micro structure,and perhapsmost importantly,the intended use,size of the pieces,and theexposure
9、conditions at the site of use(1,2,3,4).1.6 It is assumed that this practice will be used by personnelwho are qualified by education and experience to plan thenecessary evaluations and to conduct them so that the neces-sary parameters of the subject rock will be defined.Therefore,this practice does n
10、ot attempt to detail the laboratory tech-niques required,but rather to mention them and only detailthose properties that are of special concern in the course of theexamination for rock to be used for erosion control.1.7 UnitsThe values stated in SI units are to be regardedas standard.The inch-pound
11、units given in parentheses areprovided for information only.1.8 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 safety,health,and environmental practices and deter-mine t
12、he applicability of regulatory limitations prior to use.NOTE1Erosion stone pieces can weigh from several hundred poundsto several tons.Exercise caution at all times as the mass of each piecerepresents a potential pinch point and a lifting,handling,and carryinghazard.1.9 This practice offers a set of
13、 instructions for performingone or more specific operations.This document cannot replaceeducation or experience and should be used in conjunctionwith professional judgment.Not all aspects of this practice maybe applicable in all circumstances.This ASTM standard is notintended to represent or replace
14、 the standard of care by whichthe adequacy of a given professional service must be judged,nor should this document be applied without consideration ofa projects many unique aspects.The word“Standard”in thetitle of this document means only that the document has beenapproved through the ASTM consensus
15、 process.1.10 This international standard was developed in accor-dance with internationally 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 TechnicalBa
16、rriers to Trade(TBT)Committee.1This practice is under the jurisdiction of ASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.17 on Rock for ErosionControl.Current edition approved Jan.1,2022.Published January 2022.Originallyapproved in 1989.Last previous edition approved in 2014 as D4992 142.DOI:10.1520/D4992-22.2The boldface numbers in parentheses refer to the list of references at the end ofthis standard.*A Summary of Changes section appears at the end of t
