1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 10772:2012Geotextiles Test methodfor the determination ofthe filtration behaviour ofgeotextiles under turbulentwater flow conditions (ISO10772:2012)BS EN ISO 10772:2012
2、 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO10772:2012.BSI, as a member of CEN, is obliged to publish EN ISO 10772:2012as a British Standard. However, attention is drawn to the fact thatduring the development of this European Standard, the UK votedagains
3、t its approval as a European Standard.The reason for the negative vote is the absence of a procedure inClause 6 for determining the undrained shear strength of the soilto be used in a test. All other parts of the standard meet with theUK approval. The UK committee will be working with CEN TechnicalC
4、ommittee 189, Working Group 4, to pursue the possibility of afuture amendment.The UK participation in its preparation was entrusted to TechnicalCommittee B/553, Geotextiles and geomembranes.A list of organizations represented on this committee can beobtained on request to its secretary.This publicat
5、ion does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 66615 5ICS 59.080.70Compliance with a British Standard cannot confer immunity from
6、legal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2013.Amendments issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 10772 August 2012 ICS 59.080.70 English V
7、ersion Geotextiles - Test method for the determination of the filtration behaviour of geotextiles under turbulent water flow conditions (ISO 10772:2012) Gotextiles - Mthode dessai pour la dtermination du comportement en filtration des gotextiles en rgime dcoulement turbulent (ISO 10772:2012) Geotext
8、ilien - Prfverfahren zur Bestimmung der Filterbestndigkeit von Geotextilien in turbulenten Strmungsbedingungen (ISO 10772:2012) This European Standard was approved by CEN on 14 August 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for g
9、iving 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 Centre or to any CEN member. This European Standard exists in three o
10、fficial 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 the official versions. CEN members are the national standards bodies
11、 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, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spai
12、n, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT 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 nat
13、ional Members. Ref. No. EN ISO 10772:2012: EBS EN ISO 10772:2012EN ISO 10772:2012 (E) 3 Foreword This document (EN ISO 10772:2012) 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
14、 by NBN. This European Standard shall be given the status of a national standard, either by publication 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
15、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 identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound
16、 to implement this European Standard: 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, Netherlands, Norway, Poland, Portugal,
17、 Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 10772:2012 has been approved by CEN as a EN ISO 10772:2012 without any modification. BS EN ISO 10772:2012ISO 10772:2012(E) ISO 2012 All rights reserved iiiContents PageForeword
18、 iv1 Scope 12 Normative references . 13 Terms and definitions . 14 Principles . 15 Test method 16 Test soils 27 Sampling and sample installation . 28 Test apparatus 29 Procedure 310 Evaluation 311 Test report . 4Annex A (informative) Grading curve 9Bibliography .10BS EN ISO 10772:2012ISO 10772:2012(
19、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 in a subject for which a
20、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 Commission (IEC) on all matter
21、s 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 committees are circulated
22、 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 not be held responsible fo
23、r identifying any or all such patent rights.ISO 10772 was prepared by Technical Committee ISO/TC 221, Geosynthetics.iv ISO 2012 All rights reservedBS EN ISO 10772:2012INTERNATIONAL STANDARD ISO 10772:2012(E)Geotextiles Test method for the determination of the filtration behaviour of geotextiles unde
24、r turbulent water flow conditions1 ScopeThis International Standard describes a test method for determining the soil passing through a geotextile filter when exposed to turbulent external water flow conditions.The test provides a value for one specific type of soil as a performance test for the desi
25、gn of erosion protection layers with geotextile filters in hydraulic engineering applications.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 edit
26、ion of the referenced document (including any amendments) applies.ISO 9862, Geosynthetics Sampling and preparation of test specimensISO 12956, Geotextiles and geotextile-related products Determination of the characteristic opening size3 Terms and definitionsFor the purposes of this document, the fol
27、lowing terms and definitions apply:3.1soil passing valueSpvcumulative average soil passing value for the three specimens after the final stage3.2cohesioncuundrained cohesion of the test soil3.3plasticity indexIPplasticity of test soil4 PrinciplesThe test simulates the exposure of geotextiles to turb
28、ulent conditions such as those that occur during wave action, the passage of a ship, etc. The filtration stability of the geotextile is determined by measuring the amount and rate of soil passing through the geotextile during the test.5 Test methodThe mechanical filtration stability of the test soil
29、 and of similar soils is determined by measuring the soil passing through the filter during each stage of the test. The test results will also show whether the rate at which soil passes through the geotextile filter has been stabilized as necessary. ISO 2012 All rights reserved 1BS EN ISO 10772:2012
30、ISO 10772:2012(E)6 Test soilsThe test soil is dried to constant mass at 105C directly before use.An example for the grading curve of a medium to coarse silt as test soil is shown in Annex A. The cohesion of the undrained test soil is less than or equal to 1,5 kN/m2.7 Sampling and sample installation
31、The sampling shall be carried out in accordance with ISO 9862. Three geotextile specimens, each with a diameter of 168 mm, are punched out of the laboratory sample. Each specimen shall be placed in a sample container with the upper surface of the geotextile facing downwards as shown in Figure 1. 1 5
32、00 g of the test soil type are placed loosely on the geotextile and spread evenly over the sample using an adjustable gauge. Compact the test soil by using a pressure that exerts a surface pressure of 2 kN/m2on the geotextile. The load is applied using 1 500 g of the test soil and a 151 mm diameter
33、brass disc weighing 2 130 g. Two pieces of non-woven geotextile material (mass per unit area: 600 g/m2, thickness: 6 mm) with diameters of 152 mm shall be placed between the upper surface of the test soil and the metal disc to prevent any loss of soil at the annular gap between the sample mould and
34、the disc.Fasten the specimen container securely on a vertically oscillating electromagnetic screen (e.g. sieving device according to ISO 12956) for compaction. Place a 5 mm thick plastic disc beneath the geotextile specimen to prevent the material from sagging while the soil is being compacted. The
35、soil shall be compacted at a frequency of 50 Hz and an amplitude of 1,5 mm for 240 s. The lid of the test specimen is then closed and the specimen stored in tap water at a temperature of 20C 5C and left to saturate for at least 16 h. Cover the test specimen with water to a depth of 20 cm. Immerse th
36、e specimen at an angle such as to prevent any air bubbles being trapped under the surface of the geotextile.8 Test apparatusThe test apparatus shall be designed to test with three sample containers simultaneously. It comprises a load-bearing steel frame with a flange-mounted electric motor (the driv
37、e), an electric control system, a v-belt drive, drive shafts fitted with turbulence-producing fans, sample containers and collecting vessels. The dimensions of the test apparatus are shown in Figures 2a), 2b) and 3. The materials, dimensions and structure of the single sample containers are shown in
38、 Figures 1a) and 1b). The sample containers are fastened firmly to the test frame by means of the brass pipe bolted in the centre of the transparent plastic lid. The pipe is also used to evacuate air from the sample containers and equalize the pressure inside them during the test. The water level in
39、 the water tank at rest is set using the millimetre scale on the transparent plastic window at the front of the tank. The rotor speed depends on the fixed v-belt pulley ratios. A reliable means of measuring the speed will be required if a variable-speed motor is used.The four-bladed turbulence-produ
40、cing agitator rotating at 260 rpm produces a turbulent flow that hits the filter sample at speeds between 70 cm/s and 90 cm/s. The passage of the blades beneath the geotextile sample produces pressure pulsations with a frequency of 17,3 Hz.The following are also necessary to carry out the determinat
41、ion of the filtration behaviour of geotextiles under turbulent water flow conditions:8.1 Drying oven, capable of maintaining a temperature of 105C 5C.8.2 Electronic balance (the resolution must be 0,01 g).8.3 Tap water.8.4 Vertically oscillating device, as described in ISO 12956.8.5 Vessels for the
42、water collection, with a volume greater than 60 l.2 ISO 2012 All rights reservedBS EN ISO 10772:2012ISO 10772:2012(E)8.6 Hydrophilic cellulose folded filter, with a diameter of 500 mm and a retention range of 5 m to 13 m.8.7 Stainless steel mesh, mesh size 11 mm, wire size 1 mm.8.8 Spacer, with the
43、dimensions 30 mm 30 mm 90 mm, made of plastic or wood.9 ProcedureThe test procedure includes five loading phases each lasting 30 min with a total duration of 150 min for each geotextile specimen. For each load phase, the following procedure should be used:9.1 Measure the water temperature in the tes
44、t container at the beginning and end of the test, which shall be in the range 20C 5C.9.2 Fill the test container with water up to a height of 20,5 cm.9.3 Remove the specimen container from the water in which it has been stored and place it in the test container immediately, immersing it at an angle
45、to prevent any air bubbles forming beneath the test surface.9.4 Adjust the height of the specimen container by placing a spacer with a height of 30 mm between the lower edge of the stainless steel mesh in the specimen container and the upper surface of the propeller, and fasten it to the test frame.
46、 Remove the spacer for the test.9.5 Subject the filter sample to a turbulent flow. Each phase is started manually at the control unit and terminated by a timer after 30 min.Place vessels for water collection beneath the test container. The outlet of the test container shall be opened to allow for wa
47、ter discharge without significant turbulence. The water with the passed granular material shall be collected to enable measurement and analysis of the soil.9.6 Continue the test after refilling the test container with fresh water for each remaining phase.9.7 The quantity of soil passing through the
48、filter is determined from the water collected in the vessel by filtering, drying (at 105C 5C) and weighing. If required, the grading curve of the soil passing through the filter can be determined. A hydrophilic cellulose folded filter is used for the filtration.10 EvaluationThe mean values for the s
49、oil passing through the geotextile filter obtained for the three specimens are plotted against the loading phases to produce a cumulative curve.The gradient of the slope of the graph shows whether the filtration rate has been stabilized, the relevant values being the quantity of soil washed through the filter in the final test phase (120 min to 150 min after the beginning of the test).The soil passing value for each test phase shall be determined by taking the average weight of the soil passing through the three specimens at e
