人民长江
人民長江
인민장강
YANGTZE RIVER
2014年
6期
4-6
,共3页
渠道防渗%衬砌排水%复合土工膜%南水北调中线工程
渠道防滲%襯砌排水%複閤土工膜%南水北調中線工程
거도방삼%츤체배수%복합토공막%남수북조중선공정
anti-seepage of canal%drainage of lining%composited geo-membrane%Middle Route Project of South-to-North Water Diversion
为了减少南水北调中线工程总干渠的输水损失，采用渠道全断面现浇混凝土衬砌的防渗措施，对于土质较好且渗透系数较小的全挖方渠段，能够起到较好的防渗作用。针对存在侧向或者垂直渗漏问题的渠段，采用复合土工膜加强防渗。对于衬砌结构在地下水位高于渠水位时可能发生失稳的安全隐患，设计了由排水垫层、透水软管和逆止阀等配套的排水设施，并在渠坡采用塑料排水盲沟作为排水垫层。现场施工实践表明，这些排水措施取得了良好效果。
為瞭減少南水北調中線工程總榦渠的輸水損失，採用渠道全斷麵現澆混凝土襯砌的防滲措施，對于土質較好且滲透繫數較小的全挖方渠段，能夠起到較好的防滲作用。針對存在側嚮或者垂直滲漏問題的渠段，採用複閤土工膜加彊防滲。對于襯砌結構在地下水位高于渠水位時可能髮生失穩的安全隱患，設計瞭由排水墊層、透水軟管和逆止閥等配套的排水設施，併在渠坡採用塑料排水盲溝作為排水墊層。現場施工實踐錶明，這些排水措施取得瞭良好效果。
위료감소남수북조중선공정총간거적수수손실，채용거도전단면현요혼응토츤체적방삼조시，대우토질교호차삼투계수교소적전알방거단，능구기도교호적방삼작용。침대존재측향혹자수직삼루문제적거단，채용복합토공막가강방삼。대우츤체결구재지하수위고우거수위시가능발생실은적안전은환，설계료유배수점층、투수연관화역지벌등배투적배수설시，병재거파채용소료배수맹구작위배수점층。현장시공실천표명，저사배수조시취득료량호효과。
In order to reduce water delivery loss of Main Canal in Middle Route Project of South-to-North Water Diversion, the anti-seepage measures of whole-section concrete lining was adopted, which is effective for the whole-excavated canal with better geotechnical condition and small permeability coefficient. But for canal section with lateral and vertical seepage problem, the composite geo-membrane is necessary to strengthen the anti-seepage design. The lining structure might be unstable in the case of underground water higher than canal water;therefore the drainage solution, consisted of drainage blanket, pervious hose and check valve, was designed and the plastic blind drainage ditch was used in canal slope. The in-situ practice shows that the drainage measures were effective.
