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用于排水暗管的外包料主要有无机、有机和合成材料等多种类型．对暗管合成外包料进行试验的目的是，比较不同合成外包料的透水防沙效果，并建立选用外包料的准则等．试验装置主要采用了一维及二维渗透试验装置．通过对2种土壤、6种合成外包料所构成的13种组合方案的一维渗透试验，比较了各种外包料的透水防沙性能，并采用二维渗流试验模型，进行了较短期和长期的观测验证，取得了满意的结果．经过试验研究．初步得出了外包料的选择准则为：（1）满足稳定性要求，即O90／d85≤2～4；（2）满足透水性要求，即O99／d15＞4．
Substances used for drainage tube outsourcing mainly inorganic, organic and synthetic materials and other types. The purpose of experimenting on the tube packaging material is to compare the effect of water and sand control of different synthetic packaging materials and to establish the criteria for selection of the packaging materials. The test device is mainly used one-dimensional and two-dimensional infiltration test device. Through the one-dimensional permeation test of 13 kinds of combination schemes composed of two kinds of soil and six kinds of synthetic materials, the water-permeable and anti-sedimentation properties of various kinds of materials were compared. The two-dimensional seepage test model was used to compare the short-term and long-term Observation and verification, and achieved satisfactory results. After experimental research. Preliminary concluded that the selection criteria for outsourcing materials: (1) to meet the stability requirements, that O90 / d85 ≤ 2 ~ 4; (2) to meet the water permeability requirements, that O99 / d15>