ARMY UFGS-31 05 22-2008 GEOTEXTILES USED AS FILTERS《用于过滤的土工织物》.pdf
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1、*USACE / NAVFAC / AFCESA / NASA UFGS-31 05 22 (August 2008)-Preparing Activity: USACE (CW) SupersedingUFGS-31 05 22 (April 2006)UNIFIED FACILITIES GUIDE SPECIFICATIONSReferences are in agreement with UMRL dated July 2008*SECTION TABLE OF CONTENTSDIVISION 31 - EARTHWORKSECTION 31 05 22GEOTEXTILES USE
2、D AS FILTERS08/08PART 1 GENERAL1.1 UNIT PRICES1.1.1 Payment1.1.2 Measurement1.1.3 Unit of Measure1.2 REFERENCES1.3 SUBMITTALS1.4 DELIVERY, STORAGE, AND HANDLINGPART 2 PRODUCTS2.1 MATERIALS2.1.1 Geotextile2.1.1.1 General2.1.1.2 Geotextile Fiber2.1.2 Seams2.1.3 Securing Pins2.2 INSPECTIONS, VERIFICATI
3、ONS, AND TESTING2.2.1 Manufacturing and Sampling2.2.2 Site Verification and TestingPART 3 EXECUTION3.1 SURFACE PREPARATION3.2 INSTALLATION OF THE GEOTEXTILE3.2.1 General3.2.2 Placement3.3 PROTECTION3.4 PLACEMENT OF CUSHIONING MATERIAL3.5 OVERLAPPING AND SEAMING3.5.1 Overlapping3.5.2 Sewn Seams3.6 FI
4、ELD TESTING- End of Section Table of Contents -SECTION 31 05 22 Page 1Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SECTION 31 05 22 Page 2Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-*USACE / NA
5、VFAC / AFCESA / NASA UFGS-31 05 22 (August 2008)-Preparing Activity: USACE (CW) SupersedingUFGS-31 05 22 (April 2006)UNIFIED FACILITIES GUIDE SPECIFICATIONSReferences are in agreement with UMRL dated July 2008*SECTION 31 05 22GEOTEXTILES USED AS FILTERS08/08*NOTE: This guide specification covers the
6、 requirements for furnishing, hauling, and placing the geotextile, complete, as specified and shown, and maintaining the geotextile until placement of the granular filter material, bedding material, and/or riprap cover is completed and accepted.Edit this guide specification for project specific requ
7、irements by adding, deleting, or revising text. For bracketed items, choose applicable items(s) or insert appropriate information.Remove information and requirements not required in respective project, whether or not brackets are present.Comments and suggestions on this guide specification are welco
8、me and should be directed to the technical proponent of the specification. A listing of technical proponents, including their organization designation and telephone number, is on the Internet.Recommended changes to a UFGS should be submitted as a Criteria Change Request (CCR).*PART 1 GENERAL*NOTE: T
9、his guide specification is to facilitate the preparation and review of specifications for procurement and installation of woven and nonwoven geotextiles as filter material. It is based on field performance and the laboratory testing of a limited number of geotextiles. Geotextiles possess greatly var
10、ying engineering properties and physical characteristics. Such variations require the designer to decide which testing method and what test criteria are necessary for each application. The apparent opening size (AOS), percent open area SECTION 31 05 22 Page 3Provided by IHSNot for ResaleNo reproduct
11、ion or networking permitted without license from IHS-,-,-(POA), geotextile permeability (Kg), and strength test described in the specifications that follow are physical property tests. While it is acceptable to specify minimum thickness value where it governs performance, it is inappropriate to use
12、thickness to identify a geotextile. Result of these tests are used to judge the acceptability of a geotextile for a particular use. Prospective geotextile suppliers should furnish these test results before their geotextile will be considered for use, or before contract specifications are adjusted to
13、 permit the use of geotextiles whose properties are outside the limits imposed by this guide. For severe soil conditions and/or for a project using a large amount of geotextiles, the specifications should require that the applicable tests be run during construction, either at a specific frequency or
14、 upon demand of the Contracting Officer. For projects requiring small amounts of geotextiles under normal soil conditions the physical properties of the geotextile supported by written authentication from an authorized representative of the manufacturers may be accepted.The actual life of geotextile
15、s is not known, and their use in inaccessible areas must be considered carefully. Therefore geotextiles should not be used as filter material in toe drains, buried collector system, relief wells, or within any portions of embankments. Caution is advised in using geotextiles on the upstream face of e
16、arth dams or to wrap permanent piezometers.Geotextiles are basically inert materials for typical civil engineering applications. However certain applications may expose the geotextile to chemical or biological activities that could drastically influence the filtration properties of the geotextile. S
17、pecific site conditions should be reviewed, and if such conditions exist, testing and specifications should be written to overcome it.Geotextile strength requirements vary with intended use and construction procedures. Experience has shown that when a heavier non-woven geotextile is used, the beddin
18、g material can often be reduced in thickness or be completely eliminated. TABLE I in SI (ENGLISH) UNITS (1) presents the most important geotextile strength properties. It should be noted that the strength requirements listed are only a guideline to the minimum values required for survivability. Spec
19、ific applications may require additional testing.Filter design criteria for geotextiles are based on the apparent opening size (AOS, which is designated as EOS in the previous guide specification), percent open area (POA, for woven only), geotextile permeability (Kg), and an appropriate percent SECT
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