DIN EN ISO 10776-2012 Geotextiles and geotextile-related products - Determination of water permeability characteristics normal to the plane under load (ISO 10776 2012) German versi.pdf

1、December 2012 Translation by DIN-Sprachendienst.English price group 9No 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).IC

2、S 59.080.70!$Z“1929055www.din.deDDIN EN ISO 10776Geotextiles and geotextile-related products Determination of water permeability characteristics normal to the plane,under load (ISO 10776:2012);English version EN ISO 10776:2012,English translation of DIN EN ISO 10776:2012-12Geotextilien und geotextil

3、verwandte Produkte Bestimmung der Wasserdurchlssigkeit normal zur Ebene unter Auflast(ISO 10776:2012);Englische Fassung EN ISO 10776:2012,Englische bersetzung von DIN EN ISO 10776:2012-12Gotextiles et produits apparents Dtermination des caractristiques de permabilit leau, perpendiculairement au plan

4、et sous contrainte (ISO 10776:2012);Version anglaise EN ISO 10776:2012,Traduction anglaise de DIN EN ISO 10776:2012-12www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 14 pages11.12 DIN EN ISO 10776:2012-12 2 A comma is used as the decima

5、l marker. National foreword This standard has been prepared by Technical Committee ISO/TC 221 “Geosynthetics” in collaboration with Technical Committee CEN/TC 189 “Geosynthetics” (Secretariat: NBN, Belgium). The responsible German body involved in its preparation was the Normenausschuss Textil und T

6、extil-maschinen (Textiles and Textile Machinery Standards Committee), Working Committee NA 106-01-11 AA Geotextilien und Geokunststoffe. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 5813 DIN EN 25813 ISO 9862 DIN EN ISO 9862 ISO 1031

7、8 DIN EN ISO 10318 ISO 10320 DIN EN ISO 10320 National Annex NA (informative) Bibliography DIN EN 25813, Water quality Determination of dissolved oxygen Iodometric method DIN EN ISO 9862, Geosynthetics Sampling and preparation of test specimens DIN EN ISO 10318, Geosynthetics Terms and definitions D

8、IN EN ISO 10320, Geotextiles and geotextile-related products Identification on site EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 10776 August 2012 ICS 59.080.70 English Version Geotextiles and geotextile-related products - Determination of water permeability characteristics normal to the

9、 plane, under load (ISO 10776:2012) Gotextiles et produits apparents - Dtermination des caractristiques de permabilit leau, Geotextilien und geotextilverwandte Produkte - Bestimmung der Wasserdurchlssigkeit normal zur Ebene unter Auflast (ISO 10776:2012) This European Standard was approved by CEN on

10、 18 August 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 national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may

11、 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 version in any other language made by translation under the responsibility of a CEN member into its own language and notified t

12、o 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, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland,

13、 Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, 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: Av

14、enue 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 10776:2012: E(ISO 10776:2012) perpendiculairement au plan et sous contrainte Contents DIN EN ISO 10776:2012-12 EN ISO 10776:2012 (E) 2 PageFor

15、eword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Principle 4 5 Specimens 4 5.1 Handling 4 5.2 Selection .4 5.3 Number and dimensions .5 5.4 Specimen conditions .5 6 Apparatus, water supply and measuring devices 5 6.1 Apparatus .5 6.2 Water supply, quality and condition 9 6.3 M

16、easuring devices .9 7 Procedure . 8 Calculation and expression of results .10 9 Test report 11 9Foreword This document (EN ISO 10776:2012) 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 publ

17、ication of an identical text or by endorsement, at the latest by February 2013, and conflicting national standards shall be withdrawn at the latest by February 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 CENEL

18、EC shall not be held responsible for identifying any or all such patent rights. 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 Republi

19、c, 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, Turkey and the United Kingdom. Endorse

20、ment notice The text of ISO 10776:2012 has been approved by CEN as EN ISO 10776:2012 without any modification. “ Geosynthetics” in collaboration with Technical Committee CEN/TC 189 “Geosynthetics” the secretariat of DIN EN ISO 10776:2012-12 EN ISO 10776:2012 (E) 3 1 ScopeThis International Standard

21、describes a method for determining the water permeability characteristics of geotextiles or geotextile-related products normal to the plane when subjected to specific normal compressive loads.2 Normative referencesThe following referenced documents are indispensable for the application of this docum

22、ent. 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 interpretation of data Techniques of estimation and tests relating to means and variancesISO 5813, Water quality D

23、etermination of dissolved oxygen Iodometric methodISO 9862, Geosynthetics Sampling and preparation of test specimensISO 10318, Geosynthetics Terms and definitions.ISO 10320, Geotextiles and geotextile-related products Identification on site3 Terms and definitionsFor the purposes of this document, th

24、e following terms and definitions apply.3.1flow velocity vN50/flow velocity normal to the plane at a 50 mm water head under a compressive stress (2, 20 and 200 kPa)NOTE The flow velocity is expressed in metres per second.4 PrincipleThe flow of water normal to the plane of a geotextile or geotextile-

25、related product is measured under a range of constant heads under a compressive stress of 2, 20 and 200 kPa.5 Specimens5.1 HandlingThe 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 withou

26、t any load.5.2 SelectionTake specimens from the sample according to ISO 9862.DIN EN ISO 10776:2012-12 EN ISO 10776:2012 (E) 4 5.3 Number and dimensionsCut five test specimens from the sample, each of suitable dimensions for the water permeability apparatus to be used.Where it is necessary to determi

27、ne the results to within a given confidence interval of the mean, determine the number of test specimens in accordance with ISO 2854.5.4 Specimen conditionsThe specimens shall be clean, free from surface deposits and without visible damage or folding marks.6 Apparatus, water supply and measuring dev

28、ices6.1 ApparatusThe apparatus shall be capable of allowing free water flow through the specimen in a direction normal to its plane while confining it between two planes. An example of the apparatus is shown in Figure 1.The test apparatus shall consist of a cylindrical cell as follows,a) The apparat

29、us shall be capable of installing a 50 mm head loss on the specimen and maintaining a constant head, for example, by adjusting the flow rate for the duration of each test with water on both sides of the specimen.b) The apparatus shall have an internal diameter of 95 mm 2 mm. The internal diameter sh

30、all have a tolerance of 0,1 mm. The diameter of the apparatus shall remain identical on both sides of the specimen. Abrupt changes in diameter shall be avoided (see Figure 2).c) The upper and lower porous circular plates bounding the sample shall consist of metallic plates of diameter that is lower

31、than or equal to 0,5 mm less than the nominal internal diameter of the apparatus. The thickness of each plate shall be greater than or equal to 15 mm. The porous central area of the plate shall be perforated by a series of 2,5 mm 0,2 mm holes that are perpendicular to the face of the plate. The patt

32、ern of holes shall be uniformly distributed about the horizontal and vertical diameter of the plate in accordance with Figure 3. The plates shall have markings that facilitate alignment of the holes The diameter of the specimen that is exposed to flow shall be greater than or equal to 85 % of the in

33、ternal diameter of the apparatus.d) d) A loading mechanism shall be capable of sustaining a constant normal compressive stress on the specimen of 2, 20 and 200 kPa with a tolerance of 5 %. For the purpose of calculating the compressive stress, the area to be used shall be the gross area of the upper

34、 plate.The normal compressive stress shall be applied to the upper and lower porous plates by a circular stainless steel ring of outer diameter 1 mm less than the internal diameter of the apparatus and a thickness lower than or equal to 2,5 mm. The height of the ring shall be greater than 25 mm. The

35、 transference of load from the loading mechanism to the loading ring above the porous plates shall not reduce the flow area of the apparatus by more than 1 000 mm2.e) The apparatus shall be capable of maintaining the proposed normal compressive stress on the specimen without deformations that could

36、influence the test results.f) The apparatus shall be capable of preventing flow at the edge of the specimen.DIN EN ISO 10776:2012-12 EN ISO 10776:2012 (E) 5 23567164Key1 Glass tube 5 Specimen location (see detail on Figure 1b)2 Loading device 6 Carrying plate for accommodation of dead weights3 Hydra

37、ulic head application device 7 Central plate4 Overflow Figure 1 Example of apparatus; schematic principle for the determination of the permeability characteristics under loadDIN EN ISO 10776:2012-12 EN ISO 10776:2012 (E) 6 24387651Key1 Glass tube 5 Lower perforated plate2 Central plate 6 Upper perfo

38、rated plate3 Specimen 7 Loading device4 O-ring 8 Hydraulic head application deviceFigure 2 Schematic drawing (not to scale) of central part of the cell with specimenDIN EN ISO 10776:2012-12 EN ISO 10776:2012 (E) 7 Dimensions in millimetres243651114,40,52,52,2 2,2Key1 Ring notch2 Hole perforation3 Be

39、aring4 Hole perforation5 Lower face of the top plate6 Upper face of the top plateFigure 3 Perforation pattern and upper and lower plate arrangementDIN EN ISO 10776:2012-12 EN ISO 10776:2012 (E) 8 6.2 Water supply, quality and conditionThe water shall be at a temperature between 18 C and 22 C.Water m

40、ay 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 shall be de-aired or fed from a stilling tank. The water shall not be continuously recycled unless special measures a

41、re taken to avoid the accumulation of sediment or particles and that the water is continuously monitored to ensure the acceptability of the water quality.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.The water

42、shall be filtered if suspended solids are visible to the naked eye or if solids accumulate on or in the specimen, thus reducing the flow with time.6.3 Measuring devices6.3.1 A dissolved-oxygen meter or apparatus conforming to ISO 5813.6.3.2 A stopwatch with an accuracy of 0.1 s.6.3.3 A thermometer w

43、ith an accuracy of 0.2C.6.3.4 A measuring vessel for determining the volume of water which has a maximum permissible error lower than or equal to 20 ml. Alternatively, the volume may be determined by weighing with a balance having a maximum permissible error lower than or equal to 2 % of the measure

44、d value.Where direct measurements of flow velocity are made, the gauge shall be calibrated to a maximum permissible error of 5 %.6.3.5 A measurement device to determine the 50 mm head loss with an accuracy of 3 %.7 Procedure7.1 Place the specimens under water containing a wetting agent (aryl alkyl s

45、odium sulfonate at 0,1 % V/V content) at laboratory temperature, gently stir to remove air bubbles and leave to saturate for at least 12 h.7.2 Assemble the apparatus and ensure that all joints are watertight. The plates must be installed so that the holes in both plates are aligned.7.3 Place a seati

46、ng stress of 2 kPa on the loading plates (without specimen) and fill the apparatus inlet reservoir with water to allow water to flow through the plates in order to remove air. Take all necessary precautions to avoid preferential flow paths along the boundaries of the specimen(s). If such flows are o

47、bserved, re-seal and re-seat the plates.7.4 Charge the apparatus with water until there is a 50 mm head loss across the plates. Shut off the water supply and, if the water heads do not equalize in the reservoirs on each side of the specimen(s) within 5 min., investigate the likelihood of any trapped

48、 air within the apparatus and repeat the procedure. If the water heads cannot be equalized within 5 min, this shall be noted in the test report.7.5 Adjust the flow to attain a 50 mm head loss or a head loss as close as possible to 50 mm (so that the flow is such that there is no loss or gain in head) and record this value with a resolution of 1 mm . When the head loss has been steady for a minimum of 30 s, collect the water passing through the system in the measuring vessel over a fixed pe