1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 22476-7:2012Geotechnical investigation and testing Field testingPart 7: Borehole jack testBS EN ISO 22476-7:2012 BRITISH STANDARDNational forewordThis British Standard
2、is the UK implementation of EN ISO 22476-7:2012. It partially supersedes BS 5930:1999+A2:2010, which is currently being revised in order to remove conflicting material.The tests included in BS 5930:1999 (Clauses 25.7.2.1 and 25.7.4.1, and more generally in Clauses 27.7.3, 25.7.5 and 25.7.6) are also
3、 provided in this standard. In the meantime, where conflict arises between these documents, the provisions of BS EN ISO 22476-7:2012 take precedence.The UK participation in its preparation was entrusted to Technical Committee B/526/3, Site investigation and ground testing.A list of organizations rep
4、resented on this committee can be obtained 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 2013. Published by BSI Standards Limited 2013ISBN 978 0
5、 580 77123 1 ICS 93.020 Compliance 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 2013.Amendments/corrigenda issued since publicationDate Text affectedEUROPEAN ST
6、ANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 22476-7 December 2012 ICS 93.020 English Version Geotechnical investigation and testing - Field testing - Part 7: Borehole jack test (ISO 22476-7:2012) Reconnaissance et essais gotechniques - Essais en place - Partie 7: Essai au dilatomtre rigide diamtra
7、l (ISO 22476-7:2012) Geotechnische Erkundung und Untersuchung - Felduntersuchungen - Teil 7: Seitendruckversuch (ISO 22476-7:2012) This European Standard was approved by CEN on 25 November 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions
8、for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in th
9、ree 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 official versions. CEN members are the national standards b
10、odies 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, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
11、 Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CE
12、N national Members. Ref. No. EN ISO 22476-7:2012: EBS EN ISO 22476-7:2012 EN ISO 22476-7:2012 (E) 3 Foreword This document (EN ISO 22476-7:2012) has been prepared by Technical Committee CEN/TC 341 “Geotechnical Investigation and Testing“, the secretariat of which is held by ELOT, in collaboration wi
13、th Technical Committee ISO/TC 182 “Geotechnics“. 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 June 2013, and conflicting national standards shall be withdrawn at the latest by June 2013. Attent
14、ion is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organisations of t
15、he 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, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Nether
16、lands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN ISO 22476-7:2012ISO 22476-7:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope 12 Normative references . 13 Terms, definitions and symbols
17、 13.1 Terms and definitions . 13.2 Symbols and abbreviations 34 Equipment . 45 Test procedure . 85.1 Calibration of the testing device . 85.2 Pocket drilling and device placing . 85.3 Loading programme . 85.4 Back-filling of borehole .105.5 Safety requirements .106 Test results 106.1 Basic equations
18、 .106.2 Loading tests 116.3 Constant load test . 117 Reporting . 117.1 General . 117.2 Reporting of test results 127.3 Choice of axis scaling 137.4 Presentation of test results 13Annex A (normative) Dimensions of borehole jacks and related device factors 14Annex B (normative) Calibration and correct
19、ion .15Annex C (normative) Field report example 16Annex D (informative) Test example 17Annex E (normative) Placing the borehole jack in the ground 20Annex F (normative) Resolutions and uncertainties 22Bibliography .23BS EN ISO 22476-7:2012ISO 22476-7:2012(E)ForewordISO (the International Organizatio
20、n 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
21、 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.Intern
22、ational Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publicatio
23、n as an International Standard requires approval by at least 75 % of the member bodies casting a vote.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 patent rights.
24、ISO 22476-7 was prepared by the European Committee for Standardization (CEN) Technical Committee CEN/TC 341, Geotechnical investigation and testing, in collaboration with Technical Committee ISO/TC 182, Geotechnics, Subcommittee SC 1, Geotechnical investigation and testing, in accordance with the Ag
25、reement on technical cooperation between ISO and CEN (Vienna Agreement).ISO 22476 consists of the following parts, under the general title Geotechnical investigation and testing Field testing: Part 1: Electrical cone and piezocone penetration test Part 2: Dynamic probing Part 3: Standard penetration
26、 test Part 4: Mnard pressuremeter test Part 5: Flexible dilatometer test Part 7: Borehole jack test Part 9: Field vane test Part 10: Weight sounding test Technical Specification Part 11: Flat dilatometer test Technical Specification Part 12: Mechanical cone penetration test (CPTM)iv ISO 2012 All rig
27、hts reservedBS EN ISO 22476-7:2012ISO 22476-7:2012(E)IntroductionThe results of borehole jack tests are used for ground deformation calculations provided that the range of stresses applied in the test are representative of the stresses caused by the proposed foundation. Local experience normally imp
28、roves the application of the results.For identification and classification of the ground, the results of sampling (according to ISO 22475-1) from each borehole are available for the evaluation of the tests. In addition, identification and classification results (ISO 14688-1 and ISO 14689-1) are avai
29、lable from every separate ground layer within the desired investigation depth (see EN 1997-2:2007, 2.4.1.4(2) P, 4.1(1) P and 4.2.3(2) P.) ISO 2012 All rights reserved vBS EN ISO 22476-7:2012BS EN ISO 22476-7:2012Geotechnical investigation and testing Field testing Part 7: Borehole jack test1 ScopeT
30、his part of ISO 22476 specifies the equipment requirements, execution of and reporting on borehole jack tests.NOTE This part of ISO 22476 fulfils the requirements for borehole jack tests as part of geotechnical investigation and testing according to EN 1997-1 1 and EN 1997-2 2.This part of ISO 22476
31、 specifies the procedure for conducting a borehole jack test in ground stiff enough not to be adversely affected by the drilling operation. Two diametral cylindrical steel loading plates are placed in the ground and opened by pressure. Pressure applied to, and associated opening of the probe are mea
32、sured and recorded so as to obtain a stress-displacement relationship of the ground for the range of the expected design stress.This part of ISO 22476 applies to test depths of 100 m and to testing either on land or off-shore.2 Normative referencesThe following referenced documents are indispensable
33、 for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including amendments) applies.ISO 10012, Measurement management systems Requirements for measurement processes and measuring equipmentIS
34、O 14688-1, Geotechnical investigation and testing Identification and classification of soil Part 1: Identification and descriptionISO 14689-1, Geotechnical investigation and testing Identification and classification of rock Part 1: Identification and descriptionISO 22475-1, Geotechnical investigatio
35、n and testing Sampling methods and groundwater measurements Part 1: Technical principles for executionISO/IEC Guide 98-3, Uncertainty of measurement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)3 Terms, definitions and symbols3.1 Terms and definitionsFor the purposes of th
36、is document, the following terms and definitions apply.3.1.1equipment for borehole jack testborehole jack, hydraulic pump, measuring unit and cables to connect the borehole jack to the measuring unit and the hydraulic pumpINTERNATIONAL STANDARD ISO 22476-7:2012(E) ISO 2012 All rights reserved 1BS EN
37、 ISO 22476-7:2012ISO 22476-7:2012(E)3.1.2borehole jack soundingseries of successive operations necessary to perform borehole jack testing at a given location, i.e. forming a borehole and performing borehole jack tests in this borehole3.1.3pocket for jack testcircular cylindrical cavity drilled in a
38、borehole in which to insert the borehole jack device3.1.4borehole jackcircular cylindrical instrument in which two diametrically opposed curved plates on the outside are forced apart by the application of hydraulic pressure to one or more small jacks located between them3.1.5borehole jack testproces
39、s of jacking two cylindrical loading plates diametrically outwards against the borehole wall and measuring their associated expansion as a function of pressure and time NOTE 1 See Figure 1.NOTE 2 When testing in a borehole where the hydraulic head in the instrument supply line is likely to exceed th
40、e hydraulic head of the fluid in the borehole, consideration must be given to restricting the expansion of the instrument before it enters the pocket and at the conclusion of the test.3.1.6depth of testdistance between the ground level and the centre of the loading plates measured along the borehole
41、 axisNOTE See Figure 2.3.1.7operatorqualified person who carries out the test2 ISO 2012 All rights reservedBS EN ISO 22476-7:2012ISO 22476-7:2012(E)3.2 Symbols and abbreviationsFor the purposes of this International Standard the symbols and abbreviations of Table 1 apply.Table 1 SymbolsSymbol Descri
42、ption UnitA Projected area of the cylindrical loading plates on the plane normal to the axis of expansionm2AcCross section area in one jack cylinder m2b Width of the loading plates mmd Design diameter of the jack mmd0Initial diameter of test pocket mmdcCurrent diameter of test pocket mmdsDiameter of
43、 the pocket at the start of the test mme Associated loading plate expansion mme1Loading plates expansion at time t1or pressure p1mme2Loading plates expansion at time t2or pressure p2mmeiLoading plates expansion change equals diametral displacement of borehole wallmmEBModulus of borehole jack test fo
44、r loading condition MPaEUModulus of borehole jack test for unloading condition MPaf Specific device factor kftime-dependent strain parameter mml axial length of loading plates mmlTtransducer centre-to-centre length mmp applied pressure MPapccalculated average contact stress MPapmaxmaximum contact st
45、ress MPapsinitial contact pressure MPap1pressure at time t1MPap2pressure at time t2MPaq hydraulic pressure in a jack MPaqmaxmaximum hydraulic pressure to be used MPaqsstarting pressure of the test MParcfriction resistance in one jack cylinder MPat time mint1time 1 of a constant stress test mint2time
46、 2 of a constant stress test minz test depth mzwgroundwater depth m tilt angle of the loading plates opening angle of loading plates pcchange of calculated average contact stress MPa Poissons ratio ISO 2012 All rights reserved 3BS EN ISO 22476-7:2012ISO 22476-7:2012(E)4 EquipmentThe principle of the
47、 borehole jack test is shown in Figure 1.Key1 ground surface2 borehole3 test pocket4 loading platesp applied pressureA-A axial sectionB-B cross sectionFigure 1 Example of a borehole jack testThe equipment to carry out borehole jack tests shall consist of the components shown in Figure 2.4 ISO 2012 A
48、ll rights reservedBS EN ISO 22476-7:2012ISO 22476-7:2012(E)Key1 setting rods 8 borehole jack2 signal cable 9 loading plate3 measuring unit opening angle4 pressure gauge d0initial diameter of test pocket5 hydraulic pump b width of loading plate6 pressure line z test depth7 sediment collection tube B-
49、B cross sectionFigure 2 Diagram of borehole jack equipment (depth less than 100 m)The following components are obligatory: borehole jack (No. 8 in Figure 2); pressure line (No. 6 in Figure 2); signal cable (No. 2 in Figure 2); measuring unit (No. 3 in Figure 2); hydraulic pump (No. 5 in Figure 2); pressure gauge (No. 4 in Figure 2);The following components are recommended: sediment collection tube to protect from caving (No. 7 in Figure 2); ISO 2012 All rights reserved 5BS EN ISO 22
