BS EN ISO 22282-6-2012 Geotechnical investigation and testing Geohydraulic testing Water permeability tests in a borehole using closed systems《岩土工程勘察和测试 岩土水力学试验 利用封闭式系统在钻孔中进行透水性试验》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 22282-6:2012Geotechnical investigation and testing Geohydraulic testingPart 6: Water permeability tests in a borehole using closed systemsBS EN ISO 22282-6:2012 BRITISH

2、 STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 22282-6:2012.Together with parts 1, 2, 3, 4, and 5 of BS EN ISO 22282, it partially supersedes BS 5930:1999+A2:2010, which is currently being revised in order to remove conflicting material. In the meantime, whereconf

3、lict arises between these documents, the provisions of BS EN ISO 22282-6:2012 take precedence.The test given in this standard is included in BS 5930:1999+A2:2010(Clause 25.5), and conflicting parts are now withdrawn.The UK participation in its preparation was entrusted by Technical Committee B/526,

4、Geotechnics, to Subcommittee B/526/3,Site investigation and ground testing.A list of organizations represented on this subcommittee can beobtained on request to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct

5、 application. The British Standards Institution 2012.Published by BSI Standards Limited 2012.ISBN 978 0 580 76155 3ICS 91.010.30; 93.020Compliance with a British Standard cannot confer immunityfrom legal obligations.This British Standard was published under the authority of theStandards Policy and S

6、trategy Committee on 31 October 2012.Amendments/corrigenda issued since publicationDate Text affected EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 22282-6 June 2012 ICS 93.020 English Version Geotechnical investigation and testing - Geohydraulic testing - Part 6: Water permeability tests

7、 in a borehole using closed systems (ISO 22282-6:2012) Reconnaissance et essais gotechniques - Essais gohydrauliques - Partie 6: Essais de permabilit leau dans un forage en tube ferm (ISO 22282-6:2012) Geotechnische Erkundung und Untersuchung - Geohydraulische Versuche - Teil 6: Wasserdurchlssigkeit

8、sversuche im Bohrloch unter Anwendung geschlossener Systeme (ISO 22282-6:2012) This European Standard was approved by CEN on 31 May 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a nationa

9、l 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 three official versions (English, French, German). A versio

10、n 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 bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Cze

11、ch Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION C

12、OMIT 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 CEN national Members. Ref. No. EN ISO 22282-6:2012: EBS EN ISO 22282-6:2012 EN ISO 22282-6:2012 (E

13、) 3 Foreword This document (EN ISO 22282-6:2012) has been prepared by Technical Committee CEN/TC 341“Geotechnical Investigation and Testing“, the secretariat of which is held by ELOT, in collaboration withTechnical Committee ISO/TC 182 “Geotechnics“. This European Standard shall be given the status

14、of a national standard, either by publication of an identicaltext or by endorsement, at the latest by December 2012, and conflicting national standards shall be withdrawnat the latest by December 2012. Attention is drawn to the possibility that some of the elements of this document may be the subjec

15、t of patentrights. 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 followingcountries are bound to implement this European Standard: Austria, Belgium, Bulgar

16、ia, Croatia, Cyprus, CzechRepublic, Denmark, Estonia, Finland, 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. BS EN ISO 22282

17、-6:2012ISO 22282-6:2012(E)ForewordISO (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 i

18、n 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 Commis

19、sion (IEC) on all matters of electrotechnical standardization.International 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 c

20、ommittees are circulated to the member bodies for voting. Publication 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 no

21、t be held responsible for identifying any or all such patent rights.ISO 22282-6 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

22、1, Geotechnical investigation and testing, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).ISO 22282 consists of the following parts, under the general title Geotechnical investigation and testing Geohydraulic testing: Part 1: General rules Part 2: Wa

23、ter permeability tests in a borehole using open systems Part 3: Water pressure tests in rock Part 4: Pumping tests Part 5: Infiltrometer tests Part 6: Water permeability tests in a borehole using closed systems ISO 2012 All rights reserved iiiBS EN ISO 22282-6:2012BS EN ISO 22282-6:2012 BS EN ISO 22

24、282-6:2012Geotechnical investigation and testing Geohydraulic testing Part 6: Water permeability tests in a borehole using closed systems1 ScopeThis part of ISO 22282 specifies requirements for the determination of the local permeability in soils and rocks below or above the groundwater table in a c

25、losed system by the water permeability tests as part of the geotechnical investigation services according to EN 1997-1 and EN 1997-2.The tests are used to determine the permeability coefficient k in low permeability soil and rock lower than 108m/s. It can also be used to determine the transmissivity

26、 T and the storage coefficient S.NOTE The water pressure test in rock is covered by ISO 22282-3.2 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 ed

27、ition of the referenced document (including any amendments) applies.ISO 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

28、: Identification and descriptionISO 22282-1, Geotechnical investigation and testing Geohydraulic tests Part 1: General rulesISO 22475-1, Geotechnical investigation and testing Sampling method and groundwater measurements Part 1: Technical principles for execution3 Terms, definitions and symbols3.1 T

29、erms and definitionsFor the purposes of this document, the terms and definitions given in ISO 22282-1 apply.3.2 Symbols For the purposes of this document, the symbols given in Table 1 apply.INTERNATIONAL STANDARD ISO 22282-6:2012(E) ISO 2012 All rights reserved 1BS EN ISO 22282-6:2012ISO 22282-6:201

30、2(E)Table 1 SymbolsSymbol Designation UnitCappapparent compressibility of the measurement device Pa1Cwcompressibility of the water Pa1F shape factor g acceleration due to gravity m.s2h hydraulic head mhstpre-test stabilized hydraulic head mk permeability coefficient m.s1k20permeability coefficient a

31、t a temperature of 20 C m.s1L height of the cavity mp pressure PaQ flow rate m3.s1rcradius of the measurement cavity and of the borehole mS storage coefficient T transmissivity (T = k L) m2.s1t time sV volume m3Vwvolume of water submitted to pressure pulse m3zcheight of the middle of the cavity in r

32、elation to the natural land mzcaptheight of the pressure sensor in relation to the natural land m dynamic viscosity of the water Pa.swdensity of the water kg.m3h0variation in initial hydraulic head mV0variation in initial volume m3p0variation in initial pressure Pa4 EquipmentThe basic equipment cons

33、ists of the following parts (see also the example in Figure 1): pump or pressure source capable of injecting or removing water to the water-filled system to produce a pressure pulse in the test interval; pipes; single or double packer; shut-off valve in the pipe above the test section; pressure meas

34、uring and recording device in test section; data acquisition system.2 ISO 2012 All rights reservedBS EN ISO 22282-6:2012ISO 22282-6:2012(E)Table 1 SymbolsSymbol Designation UnitCappapparent compressibility of the measurement device Pa1Cwcompressibility of the water Pa1F shape factor g acceleration d

35、ue to gravity m.s2h hydraulic head mhstpre-test stabilized hydraulic head mk permeability coefficient m.s1k20permeability coefficient at a temperature of 20 C m.s1L height of the cavity mp pressure PaQ flow rate m3.s1rcradius of the measurement cavity and of the borehole mS storage coefficient T tra

36、nsmissivity (T = k L) m2.s1t time sV volume m3Vwvolume of water submitted to pressure pulse m3zcheight of the middle of the cavity in relation to the natural land mzcaptheight of the pressure sensor in relation to the natural land m dynamic viscosity of the water Pa.swdensity of the water kg.m3h0var

37、iation in initial hydraulic head mV0variation in initial volume m3p0variation in initial pressure Pa4 EquipmentThe basic equipment consists of the following parts (see also the example in Figure 1): pump or pressure source capable of injecting or removing water to the water-filled system to produce

38、a pressure pulse in the test interval; pipes; single or double packer; shut-off valve in the pipe above the test section; pressure measuring and recording device in test section; data acquisition system.2 ISO 2012 All rights reservedBS EN ISO 22282-6:2012ISO 22282-6:2012(E)Key1 test section2 inflata

39、ble packer3 packer inflation device4 isolating valve (bottom valve)5 pressure and water temperature device6 hydraulic delivery pipe7 pressure and water temperature indicating and recording device8 water reservoir9 device for application of pressure pulse and measurement of compressibility10 ground l

40、evelFigure 1 Test equipment Example5 Test procedure5.1 GeneralThe principle of water permeability tests in a borehole using closed systems is based on an instantaneous change of the hydraulic head in a test section. The dissipation of imposed head is recorded as a function of time.According to Figur

41、e 1, a volume of water is pressurized on a test section of a borehole closed off by one or more packers in order to determine dissipation of pressure with time. ISO 2012 All rights reserved 3BS EN ISO 22282-6:2012ISO 22282-6:2012(E)The test can be carried out in a borehole of any orientation and dia

42、meter. The test section may be located above or below the groundwater level.5.2 Installation of equipmentThe test rod or tubing shall be installed into the borehole with the valve open.The packer(s) shall be inflated or the sealing plug shall be installed.5.3 Determination of the pre-test stabilized

43、 hydraulic head5.3.1 Below water tableBelow groundwater table, an initial measurement of the initial hydraulic head in the soil or rock to be tested shall be conducted: starting the recording system of the pressure in the test section; closing the isolating valve; monitoring the pressure, until the

44、state of equilibrium is reached.Monitoring shall be continued until the head variation h is less than 10 % of variation in initial head.5.3.2 Above water tableIn the case of a test in initially unsaturated soil, the soil around the test section shall be initially saturated before applying the pressu

45、re pulse. This saturation results in a major reduction of the suction in the vicinity of the test section.The recommended value for the constant hydraulic head for this phase is approximately 1 m of water with respect to the ground level. The volume infiltrated during this phase shall be estimated a

46、nd indicated in the test report. The duration of the infiltration phase depends largely on the permeability of the soil. Table 1 indicates the minimum duration of the saturation phase for various permeability ranges.Table 2 Duration of saturation phase and permeability rangesPermeability coefficient

47、 k (m/s)1,1081,1091,1010Duration of saturation phase (hours)3 10 20After the saturation phase, stabilized hydraulic head is determined according to 5.3.1.5.3.3 Application of the pressure pulseWith the isolating valve still in the closed position, the pressure variation shall be adjusted above the v

48、alve to be produced within the test section.The amplitude of the pressure pulse shall be limited in order to avoid all risks of hydraulic fracturing of the soil within the test section. The hydraulic head increment above ground level shall be less than 30 % of the depth of the test section.The press

49、ure in the test section shall be measured and recorded every second.The isolating valve shall be opened for 2 s to allow the pressure to apply in the whole system, and then it shall be closed.4 ISO 2012 All rights reservedBS EN ISO 22282-6:2012ISO 22282-6:2012(E)The test can be carried out in a borehole of any orientation and diameter. The test section may be located above or below the groundwater level.5.2 Installation of equipmentThe test rod or