1、August 2010 Translation by DIN-Sprachendienst.English price group 11No 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、 59.080.70!$j#“1712900www.din.deDDIN EN ISO 12958Geotextiles and geotextile-related products Determination of water flow capacity in their plane (ISO 12958:2010)English translation of DIN EN ISO 12958:2010-08Geotextilien und geotextilverwandte Produkte Bestimmung des Wasserableitvermgens in der Eben
3、e (ISO 12958:2010)Englische bersetzung von DIN EN ISO 12958:2010-08Gotextiles et produits apparents Dtermination de la capacit de dbit dans leur plan (ISO 12958:2010)Traduction anglaise de DIN EN ISO 12958:2010-08SupersedesDIN EN ISO 12958:1999-06www.beuth.deIn case of doubt, the German-language ori
4、ginal shall be considered authoritative.Document comprises 20 pages08.10 DIN EN ISO 12958:2010-08 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee ISO/TC 221 “Geosynthetics” in collaboration with Technical Committee CEN/TC 189 “Geosynt
5、hetics” (Secretariat: NBN, Belgium). The responsible German body involved in its preparation was the Normenausschuss Textil und Textil-maschinen (Textiles and Textile Machinery Standards Committee), Working Committee NA 106-01-11 AA Geotextilien und Geokunststoffe. Attention is drawn to the possibil
6、ity that some of the elements of this document may be the subject of patent rights. DIN shall not be held responsible for identifying any or all such patent rights. Amendments This standard differs from DIN EN ISO 12958:1999-06 as follows: a) The standard has been revised and brought in line with th
7、e state of the art. b) Normative references have been updated. c) In clause 5 and subclause 7.7, the notes have been specified as requirements. d) In subclause 7.12, testing at stresses equal to 20 kPa, 100 kPa and 200 kPa has been added. e) In subclause 8.2, the last paragraph has been added. f) Al
8、l figures have been revised and assigned to the corresponding clauses. g) The bibliography has been updated. The DIN Standards corresponding to the International Standards referred to in this document are as follows: IISO 5813 DIN EN 25813 ISO 9862 DIN EN ISO 9862 ISO 9863-1 DIN EN ISO 9863-1 ISO 10
9、320 DIN EN ISO 10320 ISO 25619-1 DIN EN ISO 25619-1 Previous editions DIN EN ISO 12958: 1999-06 DIN EN ISO 12958:2010-08 3 National Annex NA (informative) Bibliography DIN EN 25813, Water quality Determination of dissolved oxygen Iodometric method DIN EN ISO 9862, Geosynthetics Sampling and preparat
10、ion of test specimens DIN EN ISO 9863-1, Geosynthetics Determination of thickness at specified pressures Part 1: Single layers DIN EN ISO 10320, Geotextiles and geotextile-related products Identification on site DIN EN ISO 25619-1, Geosynthetics Determination of compression behaviour Part 1: Compres
11、sive creep properties DIN EN ISO 12958:2010-08 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 12958 April 2010 ICS 59.080.70 Supersedes EN ISO 12958:1999English Version Geotextiles and geotextile-related products - Determination of water flow capacity in
12、their plane (ISO 12958:2010) Gotextiles et produits apparents - Dtermination de la capacit de dbit dans leur plan (ISO 12958:2010) Geotextilien und geotextilverwandte Produkte - Bestimmung des Wasserableitvermgens in der Ebene (ISO 12958:2010) This European Standard was approved by CEN on 8 March 20
13、10. 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 national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained
14、on application to the CEN Management Centre 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 Management
15、Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
16、Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any f
17、orm and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 12958:2010: EContents DIN EN ISO 12958:2010-08 EN ISO 12958:2010 (E) 2 Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Principle5 5 Apparatus and materials.5 6 Specimens 8 6.1 Handling8 6
18、.2 Selection .8 6.3 Number and dimensions.8 6.4 Specimen condition.9 7 Test procedure.9 8 Calculations and expression of results.10 9 Test report 11 Annex A (informative) Determination of the correction factor RTfor conversion to a water temperature of 20 C13 Annex B (informative) Experimental data
19、and calculations for a specimen .15 Bibliography 16 Foreword This document (EN ISO 12958:2010) has been prepared by Technical Committee ISO/TC 221 which is held by NBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorseme
20、nt, 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 and/or CENELEC shall not be held responsible for identifyi
21、ng any or all such patent rights. This document supersedes EN ISO 12958:1999. 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,
22、 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 the United Kingdom. Endorsement notice The text of ISO 12958:2010 has been a
23、pproved by CEN as a EN ISO 12958:2010 without any modification. “Geosynthetics” in collaboration with Technical Committee CEN/TC 189 “Geosynthetics” the secretariat of DIN EN ISO 12958:2010-08 EN ISO 12958:2010 (E) 3 1 Scope This International Standard specifies a method for determining the constant
24、-head water flow capacity within the plane of a geotextile or geotextile-related product. NOTE 1 If the full water flow capacity characteristics of the geotextile or geotextile-related product have previously been established, then for control purposes it can be sufficient to determine the water flo
25、w capacity at two loads and both gradients. NOTE 2 The compressibility of the product over time will substantially influence the in-plane water flow capacity. Test methods for assessing the compressive creep behaviour of geotextiles or geotextile-related products are described in ISO 25619-1. The te
26、st report is judged in conjunction with the long-term compressive creep behaviour in order to assess the long-term flow capacity. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. Fo
27、r undated references, the latest edition of the referenced document (including any amendments) applies. ISO 2854, Statistical 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
28、, Geosynthetics Sampling and preparation of test specimens ISO 9863-1, Geosynthetics Determination of thickness at specified pressures Part 1: Single layers ISO 10320, Geotextiles and geotextile-related products Identification on site 3 Terms and definitions For the purposes of this document, the fo
29、llowing terms and definitions apply. 3.1 normal compressive stress compressive stress components normal to the plane of the geotextile or geotextile-related product NOTE The normal compressive stress is expressed in kilopascals. 3.2 in-plane flow fluid flow within the geotextile or geotextile-relate
30、d product and parallel to its plane DIN EN ISO 12958:2010-08 EN ISO 12958:2010 (E) 4 3.3 in-plane water flow capacity volumetric flow rate of water per unit width of specimen at a defined gradient and load NOTE The term transmissivity is related to laminar flow conditions only and equals the water f
31、low capacity at a hydraulic gradient equal to unity. As non-laminar flow may occur, the term water flow capacity is preferred. 3.4 hydraulic gradient ratio of the head loss in the geotextile or geotextile-related product specimen to the distance between the measuring points 4 Principle The flow of w
32、ater within the plane of a geotextile or geotextile-related product is measured under varying normal compressive stresses, with typical hydraulic gradients and with defined contact surfaces. 5 Apparatus and materials 5.1 Constant-head in-plane water flow apparatus, satisfying the following requireme
33、nts: a) The apparatus shall be capable of maintaining a constant head loss at different water levels, at least those corresponding to hydraulic gradients of 0,1 and 1,0, while maintaining a water head at the point of discharge of not greater than 100 mm. b) If the water head exceeds 100 mm, the norm
34、al stress shall be corrected for the excess. c) The apparatus shall be capable of maintaining the proposed normal compressive stress on the specimen without any deformation which would influence the test results. d) The apparatus shall include a loading mechanism capable of exerting a constant norma
35、l compressive stress on the geotextile specimen to an accuracy of 5 %. e) The surfaces contacting the specimen shall be closed-cell foam rubber whose properties satisfy the compression-deflection envelope, illustrated in Figure 1, when tested in accordance with ISO 9863-1. For specimens with a thick
36、ness up to 10 mm, foam rubber with a nominal thickness of 10 mm shall be used on each face. For specimens with a thickness between 10 mm and 25 mm, foam rubber with a nominal thickness of 1 to 1,25 times the specimen thickness shall be used on each face. For specimens with a thickness over 25 mm, th
37、e foam rubber on each face shall have a nominal thickness of 25 mm. Two layers of foam rubber may be combined to achieve the desired thickness. The width of the foam shall be the same as that of the loading platen. The length of the foam should normally be the same as the loading platen. However, to
38、 avoid obstruction at both the inlet and outlet due to compression of the foam, it is recommended that its length be reduced, where necessary, by 0,4 times its nominal thickness. When the geotextile-related products to be tested have been designed to perform their hydraulic functions against rigid b
39、oundaries, the foam rubber membranes shall not be used, but shall be replaced by the appropriate boundary, e.g. a stiff high-density polyethylene liner or a concrete panel. Products for such applications can be identified typically by the fact that they have no geotextile layers to prevent soil intr
40、usion and in fact are not placed directly against a soil boundary. When foam rubber layers have not been used, the test report shall include the specific boundary used. DIN EN ISO 12958:2010-08 EN ISO 12958:2010 (E) 5 Key X normal compressive stress, in kilopascals Y thickness reduction, in percent
41、Figure 1 Compression-deflection envelope of an elastomeric closed-cell foam rubber f) The apparatus shall have a minimum width of 0,2 m and a minimum net hydraulic length of 0,3 m. It shall be capable of testing specimens up to a thickness of 50 mm. It shall also be capable of accepting foam rubber
42、with a thickness of 25 mm in contact with both faces of the material to be tested. g) The apparatus shall be essentially leaktight. At the lowest normal compressive stress and the highest hydraulic gradient, when the platen or pressure membranes with the contact surfaces are seated in the unit witho
43、ut the test specimen, the leakage shall not exceed 0,2 ml/s. Some examples of apparatus are shown in Figure 2. For determination of the hydraulic head loss, it is recommended that the apparatus in Figures 2 b) and 2 c) be provided with two manometers at a spacing of at least 0,3 m within the specime
44、n. For very low flows, the leakage shall not exceed 10 % of the flow value. DIN EN ISO 12958:2010-08 EN ISO 12958:2010 (E) 6 Dimensions in millimetres a) b) c) Key 1 water supply 5 membrane 9 loading platen 2 water collection 6 pressure cell 10 overflow weirs at hydraulic gradients 0,1 and 1,0 3 man
45、ometers 7 foam 11 water reservoir 4 specimen 8 load 12 base Figure 2 Typical examples of apparatus DIN EN ISO 12958:2010-08 EN ISO 12958:2010 (E) 7 5.2 Water: For water flow rates up to 0,3 l/(ms), the water used shall be de-aerated or fed from a stilling tank. The water shall be at a temperature be
46、tween 18 C and 22 C and the water temperature should preferably be at or above the ambient temperature of the test laboratory. The water shall not be continuously recycled. The oxygen content shall not exceed 10 mg/kg, when measured at the point where the water enters the apparatus. For water flow r
47、ates greater than 0,3 l/(ms), water from the mains supply may be used. The temperature shall be noted and all necessary measures shall be taken to avoid the inclusion of air in the tap water. NOTE As temperature correction relates only to laminar flow, it is advisable, should the flow be non-laminar
48、, to work at temperatures as close as possible to 20 C to minimize inaccuracies associated with inappropriate correction factors. The water shall be filtered if suspended solids are visible to the naked eye or if solids accumulate on or in the specimen, thus inhibiting flow. 5.3 Dissolved-oxygen met
49、er, or apparatus in accordance with ISO 5813. 5.4 Stopwatch, accurate to 0,1 s. 5.5 Thermometer, accurate to 0,5 C. 5.6 Equipment for determining the water flow rate: When the water flow rate is determined by measurements of volume, a measuring vessel for determining the volume to an accuracy of 1 % is required. When the water flow rate is measured directly by a gauge, it shall be measurable to an accuracy of 5 %. When the volume is determined by weighing, it shall be determined to an accuracy of 1 %. 5.7 Measuring dev
