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近20年来,薄膜防渗材料在水利工程上的应用有明显的增长,主要用在渠道、水池、水库防渗,临时挡水围堰防渗,土石坝防渗结构的辅助性措施和补救措施以及低水头挡水土石坝的防渗结构。目前,国内用于水利工程中的薄膜防渗材料,主要有塑料薄膜(聚氯乙烯、聚乙烯、聚丙烯)和沥青玻璃丝布油毡两大类。 对于薄膜防渗材料,人们最关心的问题之一是材料在水压力作用下的破裂强度和适应地基的变形能力。本文首先对薄膜防渗材料的工作条件进行讨论,提出以相对挠度的概念来表示材料适应地基的变形能力。在试验中,将基础支承条件恶化,用薄膜材料在
In the recent 20 years, the application of thin-film impermeable material in water conservancy projects has been obviously increased. It is mainly used in seepage channels, reservoirs, seepage prevention of infrastructures, temporary cofferdam seepage prevention, auxiliary measures for seepage control of earth-rock dam and remedial measures As well as the seepage control structure of low head retaining earth and rock dam. At present, the domestic membrane impermeable materials used in water conservancy projects are mainly plastic film (polyvinyl chloride, polyethylene, polypropylene) and asphalt glass cloth linoleum two categories. One of the greatest concerns for thin-film impermeable materials is the material’s rupture strength under water pressure and the ability to adapt to the deformation of the foundation. This paper first discusses the working conditions of the impermeable material and proposes the concept of relative deflection to represent the deformation ability of the material to adapt to the foundation. In the test, the basic support conditions deteriorated, with film material in