1、BS EN ISO11058:2010ICS 59.080.70NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDGeotextiles andgeotextile-relatedproducts Determination ofwater permeabilitycharacteristics normalto the plane, withoutload (ISO 11058:2010)This British Standardwas published under t
2、heauthority of the StandardsPolicy and StrategyCommittee on 31 May2010. BSI 2010ISBN 978 0 580 67999 5Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 11058:2010National forewordThis British Standard is the UK implementation of EN ISO 11058:2010.It supersedes BS EN ISO 11058:1999
3、 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/553, Geotextiles and geomembranes.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisio
4、nsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 11058 April 2010 ICS 59.080.70 Supersedes EN ISO 11058:1999English Version Geotextiles and geote
5、xtile-related products - Determination of water permeability characteristics normal to the plane, without load (ISO 11058:2010) Gotextiles et produits apparents - Dtermination des caractristiques de permabilit leau normalement au plan, sans contrainte mcanique (ISO 11058:2010) Geotextilien und geote
6、xtilverwandte Produkte - Bestimmung der Wasserdurchlssigkeit normal zur Ebene, ohne Auflast (ISO 11058:2010) This European Standard was approved by CEN on 15 March 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
7、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 Management Centre or to any CEN member. This European Standard exists in three official versions (English, F
8、rench, 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 Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croa
9、tia, Cyprus, Czech 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 and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDI
10、ZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 11058:2010: EBS EN ISO 11058:2010EN ISO 11058:2010 (
11、E) 3 Foreword This document (EN ISO 11058:2010) has been prepared by Technical Committee ISO/TC 221 “Geosynthetics“ in collaboration with Technical Committee CEN/TC 189 “Geosynthetics”, the secretariat of which is held by NBN. This European Standard shall be given the status of a national standard,
12、either by publication of an identical text or by endorsement, at the latest by October 2010, and conflicting national standards shall be withdrawn at the latest by October 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN
13、and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 11058:1999. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements
14、 of EU Directive(s). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hung
15、ary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 11058:2010 has been approved by CEN as a EN ISO 11058:2010 without any modific
16、ation. BS EN ISO 11058:2010ISO 11058:2010(E) ISO 2010 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Test specimens2 4.1 Handling .2 4.2 Selection.2 4.3 Number and dimensions.2 4.4 Condition of specimens2 5 Constant head method2 5.1 Pri
17、nciple2 5.2 Apparatus.2 5.3 Procedure.3 5.4 Calculation and expression of results 4 6 Falling head method4 6.1 Principle4 6.2 Apparatus.5 6.3 Procedure.6 6.4 Calculation and expression of results 6 7 Test report7 Annex A (informative) Determination of the correction factor, RT, to a water temperatur
18、e of 20 C12 Annex B (informative) Relationship between head loss and flow velocity.14 Annex C (informative) Velocity index16 Annex D (informative) Experimental data and calculations .17 BS EN ISO 11058:2010ISO 11058:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization
19、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 t
20、he 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. Interna
21、tional 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
22、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
23、. ISO 11058 was prepared by Technical Committee ISO/TC 221, Geosynthetics. This second edition cancels and replaces the first edition (ISO 11058:1999), which has been technically revised. BS EN ISO 11058:2010INTERNATIONAL STANDARD ISO 11058:2010(E) ISO 2010 All rights reserved 1Geotextiles and geote
24、xtile-related products Determination of water permeability characteristics normal to the plane, without load 1 Scope This International Standard specifies two test methods for determining the water permeability characteristics of a single layer of geotextile or geotextile-related product normal to t
25、he plane: a) the constant head method; b) the falling head method. NOTE If the full permeability characteristics of the geotextile or geotextile-related product have previously been established, then for control purposes it can be sufficient to determine the velocity index at a head loss of 50 mm on
26、ly. 2 Normative references The 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 the referenced document (including any amendments) applies. ISO 2854, Statistical
27、interpretation of data Techniques of estimation and tests relating to means and variances ISO 5813, Water quality Determination of dissolved oxygen Iodometric method ISO 9862, Geosynthetics Sampling and preparation of test specimens ISO 10320, Geotextiles and geotextile-related products Identificati
28、on on site 3 Terms and definitions For the purposes of this document the following terms and definitions apply. 3.1 velocity index VH50velocity corresponding to a head loss of 50 mm across a specimen, expressed to the nearest 1 mm/s BS EN ISO 11058:2010ISO 11058:2010(E) 2 ISO 2010 All rights reserve
29、d4 Test specimens 4.1 Handling The sample shall not be folded and shall be handled as infrequently as possible to avoid disturbance to its structure. The sample shall be kept in a flat position without any load. 4.2 Selection Take specimens from the sample according to ISO 9862. 4.3 Number and dimen
30、sions Cut five test specimens from the sample, each of suitable dimensions for the water permeability apparatus to be used. If it is necessary to determine the results to within a given confidence interval of the mean, the number of test specimens shall be determined in accordance with ISO 2854. 4.4
31、 Condition of specimens The specimens shall be clean, free from surface deposits and without visible damage or folding marks. 5 Constant head method 5.1 Principle A single, unloaded layer of geotextile or geotextile-related product is subjected to a unidirectional flow of water normal to the plane u
32、nder a range of constant heads. 5.2 Apparatus 5.2.1 Apparatus in which it is possible to observe the presence of air bubbles on the surface of the specimen, with an internal diameter of minimum 50 mm, complying with the following requirements. a) The apparatus shall be capable of installing a maximu
33、m head loss of at least 70 mm and maintaining a constant head for the duration of each test with water on both sides of the specimen. It shall be capable of achieving a constant water head of up to 250 mm. NOTE Some examples of apparatus are shown in Figure 1. b) The mean internal diameter of the ap
34、paratus shall be known to an accuracy of at least 0,1 mm. The exposed diameter of the specimen shall be the same as the internal diameter of the apparatus. The diameter of the apparatus shall remain identical on both sides of the specimen over a length of at least twice its internal diameter see Fig
35、ures 1 a) and 1 b). Abrupt changes in diameter shall be avoided. Alternatively see Figure 1 c), the outflow may discharge into a reservoir with a diameter of at least four times the exposed diameter of the specimen. In this case, the distance from the geotextile to the base of the reservoir shall be
36、 at least 1,5 times the exposed diameter of the specimen. If the product shows an obvious pattern, this pattern shall be included at least three times along any diameter of the specimen. c) Where necessary, to avoid any visible deformation, a grid of 1 mm diameter wire and a mesh size of (10 1) mm s
37、hall be placed downstream of the specimen to support it during the test. d) The head loss measured at any velocity when a test is performed without the test specimen, but including any specimen-supporting grid, shall be less than 1 mm. BS EN ISO 11058:2010ISO 11058:2010(E) ISO 2010 All rights reserv
38、ed 35.2.2 Water supply, of the following quality and condition. a) The water shall be at a temperature of between 18 C and 22 C. NOTE As the temperature correction (see Annex A) relates only to laminar flow, it is advisable to work at temperatures as close as possible to 20 C to minimize inaccuracie
39、s associated with inappropriate correction factors, should the flow be non-laminar. b) Water may not be fed into the apparatus directly from a mains supply due to problems caused by the release of air bubbles, which can be entrapped in the structure of the specimen. The water should preferably be de
40、-aired or fed from a stilling tank. The water should not be continuously recycled. c) The oxygen content shall not exceed 10 mg/kg. The oxygen content shall be measured at the point at which the water enters the apparatus. d) The water shall be filtered if suspended solids are visible to the naked e
41、ye or if solids accumulate on or in the specimen, thus reducing the flow with time. 5.2.3 Dissolved-oxygen meter, or apparatus complying with ISO 5813. 5.2.4 Stopwatch, with an accuracy of 0,2 s. 5.2.5 Thermometer, with an accuracy of 0,5 C. 5.2.6 Measuring vessel, of appropriate size for determinin
42、g the volume of water to an accuracy of 1 % of the capacity of the vessel. When the water flow is determined by volume, use a measuring vessel for determining volume to an accuracy of 1 %. When direct measurement of water flow velocity is made by gauge, the flow velocity shall be measured to an accu
43、racy of 5 %. When determining the water volume by mass, it shall be determined to an accuracy of 1 %. 5.2.7 Measurement device for determining the applied head, to an accuracy of 3 %. 5.3 Procedure 5.3.1 Place the specimens under water containing a wetting agent at laboratory temperature, gently sti
44、r to remove air bubbles and leave to saturate for at least 12 h. The wetting agent is aryl alkyl sodium sulfonate at 0,1 % volume. 5.3.2 Place a specimen in the apparatus and ensure that all joints are watertight. 5.3.3 Fill the apparatus with water until there is a 50 mm water head difference acros
45、s the specimen. Shut off the water supply and if the water heads do not equalize on each side of the specimen within 5 min, investigate the likelihood of any trapped air within the apparatus and repeat the procedure. If the water heads cannot be equalized within 5 min, this shall be noted in the tes
46、t report. 5.3.4 Adjust the flow to attain a head loss of (70 5) mm and record this value to the nearest 1 mm. When the head has been steady for a minimum of 30 s, collect the water passing through the system in the measuring vessel over a fixed period of time and record the volume of water collected
47、 to the nearest 10 cm3and the time to the nearest 1 s. The volume of water collected should be a minimum of 1 000 cm3and the collection time should be a minimum of 30 s. When the water flow is determined by volume, the volume of the measuring vessel shall not exceed twice the volume of the collected
48、 water. If a flow velocity gauge is used, then a maximum velocity giving a head loss of about 70 mm should be set. The real velocity shall be taken as the average of three consecutive readings with a minimum time interval between readings of 15 s. BS EN ISO 11058:2010ISO 11058:2010(E) 4 ISO 2010 All
49、 rights reserved5.3.5 Repeat 5.3.4 for four lower head losses of approximately 0,8; 0,6; 0,4 and 0,2 times the maximum head loss, starting with the highest velocity and ending with the lowest. NOTE If the full permeability characteristics of the geotextile or geotextile-related product have previously been established, then for control purposes it can be sufficient to determine the velocity index at a head loss of 50 mm only. The same principle applies to the velocity when using a flow velocity gauge. 5.3.6 Record the wate
