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法国从七十年代开始用沥青薄膜做坝面防渗材料,经实践证明是成功的。现在采用的沥青薄膜的厚度为4～6毫米,宽度为4～6米,是利用高压耐热合成纤维织物作坯布,经沥青浸渍而成的。施工方法是利用改裝的装载机或挖掘机来铺设,两块沥青防渗膜之间的搭接宽度为0.2～0.5米,搭接段用喷灯加热或浇热沥青;在坝顶开沟槽,将沥青防渗膜锚固;为保护防渗膜,可就地取材将其表面覆盖起来。
France from the seventies began to use asphalt film dam impermeable material, proved to be successful. The bitumen film currently used is 4 to 6 mm in thickness and 4 to 6 m in width. It is made of high-pressure heat-resistant synthetic fabric for gray fabric impregnated with bitumen. Construction method is the use of modified loader or excavator to lay, two asphalt impermeable membrane overlap between the width of 0.2 to 0.5 meters, lap the lap heating or pouring hot asphalt; open trench in the crest, Asphalt impermeable membrane anchoring; to protect the impermeable membrane, the material can be used to cover the surface up.