ISO INTERNATIONAL STANDARD 14688-2 Second edition 2017-12 Geotechnical investigation and testing Identification and classification of soil - Part 2: Principles for a classification Reconnaissance et essais geotechniques-Identification et classification des sols- Partie2:Principes pour une classification Reference number ISO 14688-2:2017(E) ISO @ ISO 2017 IS014688-2:2017(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISo's member body in the country of the requester. ISO copyright office Ch.de Blandonnet 8.CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org ii IS02017-Allrights reserved IS014688-2:2017(E) Contents Page Foreword iv Introduction V 1 Scope. .1 2 Normativereferences .1 3 Terms and definitions .2 4 Principles of soil classifications. 4 4.1 4 General 4.2 Particle sizefractions 6 4.3 Particle size distribution (grading) 6 4.4 Plasticity. 6 4.5 Organiccontent 7 4.6 Carbonate content .8 5 Other principles suitable for soil classification .8 5.1 General 8 5.2 Correlations of relative density terms for coarse soils 8 5.3 Undrained shear strength of fine soils. 9 5.4 Sensitivity 9 5.5 Consistency index 5.6 Other parameters. 10 Bibliography .11 @ IS0 2017- All rights reserved iii