This paper focuses on the effects of chemical precipitation on the permeability of geotextile envelopes for a subsurface drainage system in arid areas by conducting precipitation experiments of the geotextile in static or flowing solution. The results show that the precipitation process is not significantly promoted or inhibited by the network structure of geotextile. The precipitates in the form of rhombus wrap around the fiber surface. The number of geotextile pores with the smaller diameters decreases significantly after precipitation experiments. As the increase of the area density of precipitates (ΔR), the variation of the pore area (ΔS) and the variation of permeability coefficient (ΔK) of the geotextile decrease rapidly at first and then slowly. The ΔK and ΔS VS ΔR data were best fitted with logarithmic trend line. This study provides a preliminary reference for quantifying the chemical clogging process of geotextile envelopes in arid areas.

本文通过在静态或流动溶液中进行土工织物的沉淀实验，重点研究化学沉淀对干旱地区地下排水系统土工织物围护结构渗透性的影响。结果表明，土工布的网络结构对降水过程没有明显的促进或抑制作用。菱形形式的沉淀物包裹在纤维表面。沉淀实验后，直径较小的土工布孔隙数量显着减少。随着析出物面密度（ΔR）的增加，土工布孔隙面积（ΔS）的变化和渗透系数（ΔK）的变化先快后慢。ΔK和 Δ S VS Δ R数据最符合对数趋势线。该研究为量化干旱地区土工布围护结构的化学堵塞过程提供了初步参考。