1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Geotechnical investigation and testing Laboratory testing of soilPart 7: Unconfined compression test (ISO 17892-7:2017)BS EN ISO 17892-7:2018National forewordThis British Standard is the UK implementation of EN ISO 1789
2、27:2018. It is identical to ISO 178927:2017. It partially supersedes BS 13777:1990, specifically clause 5.The UK participation in its preparation was entrusted to Technical Committee B/526/3, Site investigation and ground testing.A list of organizations represented on this committee can be obtained
3、on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 94085 9ICS 13.080.20; 93.020Compliance
4、with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN ISO 178927:2018EUROPEAN
5、 STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 178927February 2018ICS 13.080.20; 93.020 Supersedes CEN ISO/TS 178927:2004EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCENCENELEC Management Centre: Avenue Marnix 17, B1000 Brussels 2018 CEN Ref. No. E
6、N ISO 178927:2018: EAll rights of exploitation in any form and by any means reserved worldwide for CEN national MembersGeotechnical investigation and testing Laboratory testing of soil Part 7: Unconfined compression test (ISO 178927:2017)Reconnaissance et essais gotechniques Essais de laboratoire su
7、r les sols Partie 7: Essai de compression uniaxiale (ISO 178927:2017)Geotechnische Erkundung und Untersuchung Laborversuche an Bodenproben Teil 7: Einaxialer Druckversuch (ISO 178927:2017)This European Standard was approved by CEN on 24 November 2017.CEN members are bound to comply with the CEN/CENE
8、LEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Uptodate lists and bibliographical references concerning such national standards may be obtained on application to the CENCENELEC Management Centre or t
9、o any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the officia
10、l versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Nor
11、way, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.English VersionEN ISO 178927:2018 (E)European forewordThis document (EN ISO 178927:2018) has been prepared by Technical Committee ISO/TC 182 “Geotechnics” in collaboration with Technical
12、 Committee CEN/TC 341 “Geotechnical Investigation and Testing” the secretariat of which is held by BSI.This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2018, and conflicting national standar
13、ds shall be withdrawn at the latest by August 2018.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.This document supersedes CEN ISO/TS 178927:2004.Acc
14、ording to the CENCENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany
15、, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.Endorsement noticeThe text of ISO 178927:2017 has been approved by CEN as EN ISO 178
16、927:2018 without any modification.2BS EN ISO 178927:2018ISO 178927:2017Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols 25 Apparatus . 25.1 General . 25.2 Load frame 35.3 Measuring devices 45.3.1 Load measuring device. . 45.3.2 Displacement measuring d
17、evice. . 45.4 Ancillary apparatus . 46 Test procedure 46.1 General requirements and equipment preparation 46.2 Preparation of specimens 46.3 Initial readings 56.4 Compression . 56.5 Dismounting 67 Test results 67.1 Bulk density, dry density and water content 67.2 Stress and strain during compression
18、 67.3 Unconfined compressive strength 67.4 Undrained shear strength 78 Test report . 78.1 Mandatory reporting . 78.2 Optional reporting . 7Annex A (normative) Calibration, maintenance and checks . 8Bibliography .10 ISO 2017 All rights reserved iiiContents PageBS EN ISO 178927:2018ISO 178927:2017Fore
19、wordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a techni
20、cal committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of e
21、lectrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document wa
22、s drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such pate
23、nt rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not c
24、onstitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT)
25、see the following URL: www.iso.org/iso/foreword.html.This document was prepared by the European Committee for Standardization (CEN) Technical Committee CEN/TC 341, Geotechnical investigation and testing, in collaboration with ISO Technical Committee TC 182, Geotechnics, in accordance with the Agreem
26、ent on technical cooperation between ISO and CEN (Vienna Agreement).This first edition of ISO 178927 cancels and replaces ISO/TS 178927:2004, which has been technically revised. It also incorporates the Technical Corrigendum ISO/TS 178927:2004/Cor 1:2006.A list of all the parts in the ISO 17892 seri
27、es can be found on the ISO website.iv ISO 2017 All rights reservedBS EN ISO 178927:2018ISO 178927:2017IntroductionThis document covers areas in the international field of geotechnical engineering never previously standardized. It is intended that this document presents broad good practice throughout
28、 the world and significant differences with national documents are not anticipated. It is based on international practice (see Reference 4). ISO 2017 All rights reserved vBS EN ISO 178927:2018This page deliberately left blankGeotechnical investigation and testing Laboratory testing of soil Part 7: U
29、nconfined compression test (ISO 17892-7:2017)1 ScopeThis document specifies a method for the unconfined compression test.This document is applicable to the determination of the unconfined compressive strength for a homogeneous specimen of undisturbed, re-compacted, remoulded or reconstituted soil un
30、der compression loading within the scope of geotechnical investigations.This test method is useful to estimate the undrained shear strength of soil. It is noted that drainage is not prevented during this test. The estimated value for undrained shear strength is, therefore, only valid for soils of lo
31、w permeability, which behave sufficiently undrained during the test.NOTE This document fulfils the requirements of unconfined compression tests for geotechnical investigation and testing in accordance with EN 1997-1 and EN 1997-2.2 Normative referencesThe following documents are referred to in the t
32、ext in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 14688-1, Geotechnical investigation and te
33、sting Identification and classification of soil Part 1: Identification and descriptionISO 17892-1, Geotechnical investigation and testing Laboratory testing of soil Part 1: Determination of water contentISO 17892-2, Geotechnical investigation and testing Laboratory testing of soil Part 2: Determinat
34、ion of bulk density3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing p
35、latform: available at http:/www.iso.org/obp3.1unconfined compressive strengthvertical stress at failure (3.3) in the test3.2undrained shear strengthshear strength in the unconfined compression test equal to one-half of the unconfined compressive strength (3.1)INTERNATIONAL STANDARD ISO 17892-7:2017
36、ISO 2017 All rights reserved 1BS EN ISO 178927:2018ISO 17892-7:20173.3failurestress or strain condition at which one of the following criteria are met: peak stress during the test; a specified deformation criterion if a peak stress has not been achieved, e.g. 15 % vertical strain.4 Symbolsvvertical
37、stress on the specimenvvertical strainquunconfined compressive strengthcuundrained shear strengthHiinitial height of the specimenH change in height of the specimen during compressioniinitial cross-sectional area of specimenP vertical load on the specimen including the weight of the top platen if it
38、is resting on the speci-men5 Apparatus5.1 GeneralThe apparatus shall undergo regular maintenance, checking and calibration as specified in Annex A.A schematic diagram of a typical apparatus for unconfined compression testing is shown in Figure 1.2 ISO 2017 All rights reservedBS EN ISO 178927:2018ISO
39、 17892-7:2017123456Key1 load frame2 load measuring device3 top platen4 bottom platen5 soil specimen6 displacement measuring deviceFigure 1 Schematic diagram of a typical unconfined compression apparatus5.2 Load frame5.2.1 The load frame shall be able to provide a range of rates of strain required fo
40、r the test (see 6.4.1) and shall have sufficient capacity to load the soil specimen to failure. The actual rate shall not fluctuate more than 20 % of the intended rate. The movement of the platen shall be smooth without vibration, such that fluctuations do not occur in the test results.5.2.2 The str
41、oke of the load frame shall be more than that required for the test. A value of 30 % of the specimen height is normally suitable.5.2.3 The top and the bottom platen shall be designed such that their deformations are negligible compared to the deformations of the soil specimen. Their diameter shall b
42、e such that no part of the soil specimen projects beyond them in any part of the test.5.2.4 The equipment shall be designed so that it maintains alignment during the test. ISO 2017 All rights reserved 3BS EN ISO 178927:2018ISO 17892-7:20175.3 Measuring devices5.3.1 Load measuring device.The accuracy
43、 of the load measuring device, within the range 20 % to 100 % of the capacity of the device, shall be 2 % of the actual value or better. The device should be insensitive to changes in horizontal forces or bending moment and to changes in temperature during a test. The capacity of the load measuring
44、device should be chosen so that the failure load is at least 20 % of its capacity.NOTE Class 1 load measuring devices calibrated to ISO 7500-1 meet this accuracy requirement.5.3.2 Displacement measuring device.The device for measuring the change in height of the specimen shall be accurate to 0,1 mm
45、or to 0,1 % of the initial specimen height, whichever is greater.5.4 Ancillary apparatusThe ancillary apparatus consists of balance, accuracy 0,01 g or 0,1 % of the weighed mass, whichever value is greater, and apparatus for determination of water content.The apparatus for the specimen preparation c
46、onsists of cutting and trimming tools (e.g. a sharp knife, wire saw, spatula, cutting ring, soil lathe), steel straight edge, with a maximum deviation from straight of 0,1 % of its length, try-square or a jig (e.g. a mitre box) or split mould to ensure that flatness shall be accurate to within 0,5 %
47、 of each dimension and that right-angles are within 0,5 of true, and callipers, either analogue or digital, readable to 0,1 mm or 0,1 % of the measured length, whichever value is greater.6 Test procedure6.1 General requirements and equipment preparation6.1.1 The cross-sectional area of the specimen
48、may either be circular or square and shall be at least 34 mm in diameter or 1 000 mm2in area.6.1.2 For cylindrical specimens, the ratio between height and diameter shall be between 1,8 and 2,5. For square specimens, the ratio between the height and length of the side shall be between 2,0 and 2,8.6.1
49、.3 The largest particle in the specimen should not exceed 1/6 of the specimen diameter for cylindrical specimens and should not exceed 1/6 of the side length for square specimens.6.1.4 Prior to each test, check that there is no visible sign of damage to any of the equipment.6.2 Preparation of specimens6.2.1 The following procedures shall apply to undisturbed, re-compacted, remoulded or reconstituted samples.4 ISO 2017 All rights reservedBS EN ISO 178927:2018ISO 17892-7:2017
