在有防水要求的地下工程中,经常采用外贴法地下卷材防水方案。为了使卷材防水层与地下工程的墙体立面防水基层紧密贴合,防止防水卷材变形,保证地下卷材的防水功能,这一防水方案要求卷材防水层表面应承受不小于0.1公斤/厘米~2的防水压力,同时,在回填土方的施工过程中,必须使卷材防水层免受土方及机械的碰撞损坏,以保证其完整性。因此,防水卷材外侧需要设置保护层。目前,大多 In underground works with waterproof requirements, the waterproofing method of underground membranes is often adopted. In order to make the waterproofing layer of the coiled material and the waterproofing layer of the wall of the underground engineering closely fit, to prevent the deformation of the waterproofing coil and ensure the waterproof function of the underground coil, this waterproofing scheme requires that the surface of the waterproofing layer of the coil should withstand not less than 0.1 kg. / Cm ~ 2 waterproof pressure, at the same time, in the construction process of backfilling the earth, the waterproofing layer of the coil must be protected from earthwork and mechanical collision to ensure its integrity. Therefore, a protective layer needs to be provided outside the waterproofing membrane. At present, most of them