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 testCopyright European Committee for Standardization Provided by IHS under license
2、 with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 22476-7:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 22476-7:2012. It partially supersedes BS 5930:1999+A2:2010, which is currently being revised in
3、 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 provided in this standard. In the meantime, where conflict arises between these documents, the provisions of BS EN ISO 22476-7:20
4、12 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 represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necess
5、ary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2013. Published by BSI Standards Limited 2013ISBN 978 0 580 77123 1 ICS 93.020 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was
6、 published under the authority of the Standards Policy and Strategy Committee on 31 March 2013.Amendments/corrigenda issued since publicationDate Text affectedCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted
7、without license from IHS-,-,-EUROPEAN STANDARD 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 - Part
8、ie 7: Essai au dilatomtre rigide diamtral (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 Reg
9、ulations which stipulate the conditions 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 mem
10、ber. 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 official versions.
11、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, Norway, Poland
12、, Portugal, Romania, Slovakia, Slovenia, 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 an
13、d by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 22476-7:2012: ECopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 22476-7:2012 EN ISO 22476-7:2
14、012 (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 with Technical Committee ISO/TC 182 “Geotechnics“. This European Standard shall be given the
15、 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. Attention is drawn to the possibility that some of the elements of this document may be the subj
16、ect 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 the following countries are bound to implement this European Standard: Austria, Belgium, Bu
17、lgaria, 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, Spain, Sweden, Switzerland,
18、Turkey and the United Kingdom. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 22476-7:2012ISO 22476-7:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivI
19、ntroduction v1 Scope 12 Normative references . 13 Terms, definitions and symbols 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-fillin
20、g of borehole .105.5 Safety requirements .106 Test results 106.1 Basic equations .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 borehol
21、e jacks and related device factors 14Annex B (normative) Calibration and correction .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 .23Cop
22、yright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 22476-7:2012ISO 22476-7:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide federation o
23、f 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. In
24、ternational 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.International Standards are drafted in accordance with t
25、he 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. Publication as an International Standard requires approval b
26、y 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.ISO 22476-7 was prepared by the European Committee
27、 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 Agreement on technical cooperation between ISO and C
28、EN (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 test Part 4: Mnard pressuremeter test Part 5: Fle
29、xible 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 rights reservedCopyright European Committee for Stand
30、ardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS 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
31、 applied in the test are representative of the stresses caused by the proposed foundation. Local experience normally improves 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 th
32、e evaluation of the tests. In addition, identification and classification results (ISO 14688-1 and ISO 14689-1) are available 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 vCopyright E
33、uropean Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 22476-7:2012Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or
34、 networking permitted without license from IHS-,-,-BS EN ISO 22476-7:2012Geotechnical investigation and testing Field testing Part 7: Borehole jack test1 ScopeThis part of ISO 22476 specifies the equipment requirements, execution of and reporting on borehole jack tests.NOTE This part of ISO 22476 fu
35、lfils 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 specifies the procedure for conducting a borehole jack test in ground stiff enough not to be adversely affected by the drilling operation.
36、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 measured and recorded so as to obtain a stress-displacement relationship of the ground for the range of the expected design stress.This part of
37、 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 for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of t
38、he referenced document (including amendments) applies.ISO 10012, Measurement management systems Requirements for measurement processes and measuring equipmentISO 14688-1, Geotechnical investigation and testing Identification and classification of soil Part 1: Identification and descriptionISO 14689-
39、1, Geotechnical investigation and testing Identification and classification of rock Part 1: Identification and descriptionISO 22475-1, Geotechnical investigation and testing Sampling methods and groundwater measurements Part 1: Technical principles for executionISO/IEC Guide 98-3, Uncertainty of mea
40、surement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)3 Terms, definitions and symbols3.1 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1.1equipment for borehole jack testborehole jack, hydraulic pump, measuring unit an
41、d 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 1Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted with
42、out license from IHS-,-,-BS EN 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 cy
43、lindrical cavity drilled in a 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 the
44、m3.1.5borehole jack testprocess 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 supp
45、ly line is likely to exceed the 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 plat
46、es measured along the borehole axisNOTE See Figure 2.3.1.7operatorqualified person who carries out the test2 ISO 2012 All rights reservedCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from I
47、HS-,-,-BS 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 Description UnitA Projected area of the cylindrical loading plates on the plane normal to the axis of expa
48、nsionm2AcCross 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 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 for loading condition MPaEUModulu
