ISO INTERNATIONAL STANDARD 17892-9 First edition 2018-02 Geotechnical investigation and testing - Laboratory testing of soil - Part 9: Consolidated triaxial compression tests on water saturated soils Reconnaissance et essais geotechniques - Essais de laboratoire sur lessols- Partie 9: Essais en compression a I'appareil triaxial consolideés sur sols satures Reference number IS0 17892-9:2018(E) ISO @ IS0 2018 IS0 17892-9:2018(E) COPYRIGHTPROTECTEDDOCUMENT @IS02018 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 beloworIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @IS02018-All rights reserved IS0 17892-9:2018(E) Contents Page Foreword V Introduction. .vi 1 Scope. .1 2 Normative references. .1 3 Terms and definitions. .2 4 Symbols. .3 5 Apparatus. .5 5.1 General .5 5.2 Triaxial cell 7 5.3 Confining membrane 7 5.4 Porous discs 7 5.5 Filter paper. 8 5.6 Pressure systems. 8 5.7 Load frame 8 5.8 Measuring devices. 8 5.8.1 Load measuring device 8 5.8.2 Pressure measuring devices 9 5.8.3 Vertical displacement measuring device .9 5.8.4 Volume change measuring device. 9 5.9 Cell and back pressure fluids. 9 5.10 Ancillary apparatus. 9 6 Test procedure. .10 6.1 General requirements and equipment preparation 10 6.2 Preparation of specimens. 10 6.3 Saturation of specimen. 11 6.3.1 Saturation 11 6.3.2 Application of cell and back pressure 12 6.3.3 Saturation checks. .12 6.4 Isotropic consolidation (CIU and CID tests) 13 6.5 Anisotropic consolidation (CAU and CAD tests) 13 6.6 End of consolidation. 13 6.7 Shearing 13 6.7.1 General. 13 6.7.2 Undrained tests (CIU and CAU) .14 6.7.3 Drained tests (CID and CAD) 14 6.8 Dismounting. 15 Test results. .15 7.1 Bulk density, dry density and water content .15 7.2 Calculations of test parameters 16 7.2.1 Heightafterconsolidation 16 7.2.2 Corrected cross sectional area. 16 7.2.3 Corrections for elastic membrane 16 7.2.4 Correction for filter paper strips 17 7.2.5 Vertical total stress. .17 7.2.6 Vertical effective stress 17 7.2.7 Horizontal total stress. 18 7.2.8 Horizontal effective stress 18 7.2.9 Pore pressure change. 18 7.2.10 Vertical strain 18 7.2.11 Vertical strain during shear 18 7.2.12 Volumetric strain 18 7.2.13 Volumetric strain during shear 18 @ IS0 2018 - All rights reserved ii IS0 17892-9:2018(E) 8 Test report .19 8.1 Mandatory reporting 19 8.2 Graphical presentation. 20 8.3 Optional reporting. 20 Annex A (normative) Calibration, maintenance and checks .21 Annex B (informative) Additional calculations for effective shear strength ..23 Bibliography .25 iv @ IS0 2018 - All rights reserved IS0 17892-9:2018(E) Foreword IsO (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 technical 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 electrotechnical 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 was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/dire