ISO INTERNATIONAL STANDARD 22476-1 Secondedition 2022-12 Geotechnical investigation and testing Field testing - Part 1: Electrical cone and piezocone penetration test Reconnaissance et essais géotechniques - Essais en place - Partie 1: Essais de pénétration au cone électrique et au piézocone Reference number IS0 22476-1:2022(E) ISO @ ISO 2022 IS0 22476-1:2022(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2022 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may 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 CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2022 - All rights reserved IS0 22476-1:2022(E) Contents Page Foreword ..V Introduction. vi 1 Scope. 2 Normativereferences 3 Terms, definitions and symbols 1 3.1 Terms and definitions 2 3.2 Symbols.... 8 4 Equipment. 11 4.1 General 11 4.1.1 Tolerances 11 4.1.2 Gaps and soil seals 11 4.2 Cone penetrometer 11 4.3 Surface roughness and hardness 11 4.4 Cone 12 4.5 Friction sleeve 13 4.6 Filter element. 14 4.6.1 General filter location 14 4.6.2 Pore pressure ui 14 4.6.3 Pore pressure u2 15 4.6.4 Pore pressure u3 15 4.7 Pushrods 15 4.8 Measuring system. 15 4.8.1 Accuracy 15 4.8.2 Sensors for cone resistance and sleeve friction 16 4.8.3 Sensor for pore pressure 16 4.8.4 Sensor for inclination. 16 4.8.5 Sensor for temperature 16 4.8.6 Measuring of penetration length 16 4.8.7 Raw data 16 4.9 Thrust machine. 17 5 Test procedures 17 5.1 Selection of equipment, procedures and evaluation of results 17 5.1.1 General 17 5.1.2 Calibration and verification requirements. 17 5.1.3 Cone penetrometer class conformity assessment 18 5.2 Position and verticality of thrust machine 20 5.3 Preparation of the test. 20 5.4 Pushing of the cone penetrometer. 21 5.5 Use of friction-reducing techniques. 21 5.6 Frequency of test data recording. 21 5.7 Registration of penetration length 21 5.8 Pore pressure dissipation test (PPDT) 22 5.9 Test completion. 22 5.10 Evaluation of CPT/CPTU in relation to test category 23 5.11 Equipment checks and calibrations. 24 5.12 Safety requirements. 24 6 Test results. 24 6.1 Measured parameters. .24 6.2 Correction of parameters. 25 6.3 Calculated parameters. 27 7 Reporting 27 7.1 General. 27 @ IS0 2022 - All rights reserved ii IS0 22476-1:2022(E) 7.2 Reporting of test results .27 7.2.1 Generalinformation 27 7.2.2 Location of the test. 28 7.2.3 Test equipment. 28 7.2.4 Test results 29 7.3 Presentationoftestresults 29 Annex A (informative) Suitability of test methods .31 Annex B (normative) Maintenance, checks and calibration .34 Annex C (informative) Calibration report example ..52 Annex D (normative) Calculation of penetration depth .62 Annex E (informative) Correction of sleeve friction for water pressure .63 Annex F (informative) Preparation of the piezocone. .64 Annex G (informative) Friction reduction techniques . .65 Bibliography 66 iv IS02022-Allrightsreserved IS0 22476-1:2022(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 throughIsOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnical 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 particula