DIN EN ISO 22476-7-2013 Geotechnical investigation and testing - Field testing - Part 7 Borehole jack test (ISO 22476-7 2012) German version EN ISO 22476-7 2012《土工调查和检验 现场检验 第7部分 钻.pdf

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1、March 2013 Translation by DIN-Sprachendienst.English price group 13No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS

2、93.020!$0“1961398www.din.deDDIN EN ISO 22476-7Geotechnical investigation and testing Field testing Part 7: Borehole jack test (ISO 22476-7:2012);English version EN ISO 22476-7:2012,English translation of DIN EN ISO 22476-7:2013-03Geotechnische Erkundung und Untersuchung Felduntersuchungen Teil 7: Se

3、itendruckversuch (ISO 22476-7:2012);Englische Fassung EN ISO 22476-7:2012,Englische bersetzung von DIN EN ISO 22476-7:2013-03Reconnaissance et essais gotechniques Essais en place Partie 7: Essai au dilatomtre rigide diamtrale (ISO 22476-7:2012);Version anglaise EN ISO 22476-7:2012,Traduction anglais

4、e de DIN EN ISO 22476-7:2013-03Together with DIN EN ISO 22476-5:2013-03supersedesDIN 4094-5:2001-06www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 29 pages02.13DIN EN ISO 22476-4:2013-03 andDIN EN ISO 22476-7:2013-03 2 A comma is used a

5、s the decimal marker. National foreword This document (EN ISO 22476-7:2012) has been prepared by Technical Committee CEN/TC 341 “Geo-technical investigation and testing” (Secretariat: ELOT, Greece) in collaboration with Technical Committee ISO/TC 182 “Geotechnics”. The responsible German body involv

6、ed in its preparation was the Normenausschuss Bauwesen (Building and Civil Engineering Standards Committee), Working Committee NA 005-05-09 AA Baugrund, Feldversuche. Amendments This standard differs from DIN 4094-5:2001-06 as follows: a) the content of DIN 4094-5 has been allocated to DIN EN ISO 22

7、746-4, DIN EN ISO 22476-5 and DIN EN ISO 22476-7. Previous editions DIN 4094-5: 2001-06 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) Rec

8、onnaissance et essais gotechniques - Essais en place - Partie 7: Essai au dilatomtre rigide diamtral Geotechnische Erkundung und Untersuchung - Felduntersuchungen - Teil 7: Seitendruckversuch This European Standard was approved by CEN on 25 November 2012. CEN members are bound to comply with the CEN

9、/CENELEC Internal Regulations 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 Cen

10、tre or to any CEN member. 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 th

11、e official versions. 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, Nether

12、lands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 2247

13、6-7:2012: EEUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNG(ISO 22476-7:2012) (ISO 22476-7:2012) Contents Page Foreword . 3 Introduction . 4 1 Scope . 5 2 Normative references. 5 3 Terms, definitions and symbols . 5 3.1 Terms and definitions 5 3.2 Sy

14、mbols and abbreviations 7 4 Equipment . 8 5 Test procedure . 12 5.1 Calibration of the testing device . 12 5.2 Pocket drilling and device placing . 12 5.3 Loading programme. 12 5.4 Back-filling of borehole . 14 5.5 Safety requirements . 14 6 Test results . 14 6.1 Basic equations 14 6.2 Loading tests

15、 15 6.3 Constant load test 15 7 Reporting 15 7.1 General 15 7.2 Reporting of test results 16 7.3 Choice of axis scaling 17 7.4 Presentation of test results . 17 Annex A (normative) Dimensions of borehole jacks and related device factors 18 Annex B (normative) Calibration and correction 19 Annex C (n

16、ormative) Field report example . 20 Annex D (informative) Test example 21 Annex E (normative) Placing the borehole jack in the ground . 24 Annex F (normative) Resolutions and uncertainties . 26 Bibliography 27 2DIN EN ISO 22476-7:2013-03 EN ISO 22476-7:2012 (E) Foreword This document (EN ISO 22476-7

17、: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 status of a national standard, either by publica

18、tion 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 subject of patent rights. CEN and/or CENELEC shall no

19、t 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, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark,

20、 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, Turkey and the United Kingdom. “ ”3DIN EN ISO 224

21、76-7:2013-03 EN ISO 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 improves the applic

22、ation 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 available from every

23、 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.)4DIN EN ISO 22476-7:2013-03 EN ISO 22476-7:2012 (E) 1 ScopeThis part of ISO 22476 specifies the equipment requirements, execution of and reporting on borehole jack tests.NOTE Thi

24、s 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 specifies the procedure for conducting a borehole jack test in ground stiff enough not to be adversely affected by th

25、e 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 measured and recorded so as to obtain a stress-displacement relationship of the ground for the range of the expected desi

26、gn 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 for the application of this document. For dated references, only the edition cited applies. For undated references, t

27、he latest edition of the 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

28、 descriptionISO 14689-1, 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

29、-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 this document, the following terms and definitions apply.3.1.1equipment for borehole jack testborehole jack, hydraulic p

30、ump, measuring unit and cables to connect the borehole jack to the measuring unit and the hydraulic pump5DIN EN ISO 22476-7:2013-03 EN ISO 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 boreho

31、le and performing borehole jack tests in this borehole3.1.3pocket for jack testcircular cylindrical 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 apa

32、rt by the application of hydraulic pressure to one or more small jacks located between them3.1.5borehole 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

33、Figure 1.NOTE 2 When testing in a borehole where the hydraulic head in the instrument supply 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 t

34、est.3.1.6depth of testdistance between the ground level and the centre of the loading plates measured along the borehole axisNOTE See Figure 2.3.1.7operatorqualified person who carries out the test6DIN EN ISO 22476-7:2013-03 EN ISO 22476-7:2012 (E) 3.2 Symbols and abbreviationsFor the purposes of th

35、is 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 expansionm2AcCross section area in one jack cylinder m2b Width of the loading plates mmd Design diamete

36、r 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 plate

37、s expansion change equals diametral displacement of borehole wallmmEBModulus of borehole jack test for 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-t

38、o-centre length mmp applied pressure MPapccalculated average contact stress MPapmaxmaximum contact stress 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 MP

39、arcfriction resistance in one jack cylinder MPat time mint1time 1 of a constant stress test mint2time 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 7

40、DIN EN ISO 22476-7:2013-03 EN ISO 22476-7:2012 (E) 4 EquipmentThe principle of the 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

41、borehole jack tests shall consist of the components shown in Figure 2.8DIN EN ISO 22476-7:2013-03 EN ISO 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

42、 plate6 pressure line z test depth7 sediment collection tube B-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

43、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);9DIN EN ISO 22476-7:2013-03 EN ISO 22476-7:2012 (E) setting rods (No. 1 in Figure 2).The nomi

44、nal diameter of the borehole shall be some millimetres larger than the external diameter of the closed borehole jack.NOTE In the case of a borehole diameter of 101 mm, a borehole jack with an external diameter of 95 mm has been shown to be suitable.Annex A shows the geometrical parameters for variou

45、s instruments.The hydraulic pressure applied to the jacking cylinders between the loading plates shall be measured by an electric transducer in the instrument (see Figure 3). The pressure may be recorded by a suitable measuring device at the ground surface.10DIN EN ISO 22476-7:2013-03 EN ISO 22476-7

46、:2012 (E) Key1 displacement transducer d design diameter of the jack2 hydraulic cylinders (variable No.) l axial length of loading plates3 spherical bearing surface lTcentre-to-centre distance of transducers4 loading plate A-A axial section5 axis of cylinder expansion B-B cross sectionb width of the

47、 loading plateFigure 3 Sketch of expanded borehole jack: axial section and cross section11DIN EN ISO 22476-7:2013-03 EN ISO 22476-7:2012 (E) The expansion of the loading plates shall be monitored by one or more electric transducers. If the loading plates are moved by hydraulic cylinders connected in

48、 parallel, at least two such transducers should be provided so that any tilt of the loading plates is recorded. If the plates cannot tilt then a single transducer is sufficient.The pressure line and the signal cable shall connect the downhole instrument to the measuring and control units at the surf

49、ace. The pressure line shall be connected to a hydraulic pump and a pressure gauge. The signal cable shall connect the transducers in the instrument to the measuring unit.5 Test procedure5.1 Calibration of the testing deviceBefore testing, the equipment shall have been calibrated and applicable corrections determined (see Annex B). Copies of the calibration documents shall be available at the job site. The following components of the equipment shall be calibrated: displacement measuring system; pressure me