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HDPE土工膜即HDPE防滲土工膜在填埋場(chǎng)中的應(yīng)用技術(shù):
一、 HDPE土工膜的選擇:根據(jù)標(biāo)準(zhǔn)《城市生活垃圾衛(wèi)生填埋技術(shù)標(biāo)準(zhǔn)》(CJJ17-2001)5.0.2.2“高密度聚乙烯土工膜厚度不應(yīng)小于1.5mm,并應(yīng)具有較大延伸率?!钡囊?guī)定,同時(shí)結(jié)合工程的地質(zhì)條件、填埋物性質(zhì)、工程重要程度、設(shè)計(jì)等要求,一般選用厚度為1.5mm和2.0mm的HDPE土工膜,并根據(jù)工程實(shí)際情況確定每卷土工膜的長度。泰安市瑞恒土工材料有限公司yufuhua.cn建議施工單位選用GH-2或建設(shè)部《CJ/T234-2006》標(biāo)準(zhǔn)以上的HDPE土工膜HDPE geomembrane HDPE geomembrane in landfill technology:
A, HDPE geotechnical membrane choice: according to the national standard " city life garbage sanitary landfill technology standard " ( CJJ17-2001 ) 5.0.2.2 " high density polyethylene geomembrane thickness shall not be less than 1.5mm, and should have greater elongation. " Provisions, combined with the engineeringgeological conditions, nature, important degree of landfill engineering, design requirements, generallyselected for the thickness of 1.5mm and 2.0mm HDPE geomembrane, and according to the actual situation,determine the length of each volume geotechnical membrane. Tai'an Ruiheng geotechnical material limited company yufuhua.cn recommended construction unit using GH-2 or the Ministry of construction "CJ/T234-2006 " more than the standard HDPE geotechnical membrane
Two, the structure of impermeable layer of landfill is mainly composed of two parts: a bottom liner system and top cover system.
In 1, the bottom liner system structure is divided into 11 layers, from top to bottom sequentially for compacted soil layer ( 150mm ), modified bentonite ( 100mm ), HDPE geotechnical membrane ( 1.5mm ), non-woven (specifications for 600g/㎡), gravel ( 300mm, local under drains, pipe ), non-woven ( specifications for 400g/㎡),HDPE geotechnical membrane ( 2.0mm ), non-woven ( specifications for 600g/㎡), gravel ( 300mm, locallyunder the drain ), non-woven ( specifications for 400g/㎡), quartz sand ( 150mm ).
In 2, the top cover structure of the system into 8 layers, from top to bottom sequentially for compacted soil layer( 150mm ), modified bentonite ( 100mm ), HDPE geotechnical membrane ( 1.5mm ), non-woven (specifications for 600g/㎡), HDPE geotechnical membrane ( 2.0mm ), non-woven ( specifications for 600g/㎡,concrete ( 300mm ) ( 300mm ), the common soil, planting turf ).
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