Nonwoven-geotextile is used to construct soil-geotextile capillary barrier for minimizing water infiltration. However, the sand-geotextile capillary barrier breakthrough can occur due to the low water retention ability and the high saturated permeability coefficient of sand. To address this, enzyme induced carbonate precipitation (EICP) technology was applied to the overlying sand layer to improve its hydraulic properties and enhance the sand-geotextile capillary barrier. The precipitated calcium carbonate has the potential to enhance the capillary barrier effect by coating soil particles and filling the soil macro-pores. To investigate the effect of EICP treatment on the sand-geotextile capillary barrier, three column tests were conducted, including one untreated sand-geotextile column and two sand-geotextile columns treated with 0.5 and 1 mol/L urea-calcium chloride solutions and soybean urease liquid, respectively. Transient seepage analysis was carried out based on the column tests to calibrate the hydraulic parameters. A numerical parametric analysis was conducted to assess the effect of EICP-enhancement on the hydraulic behavior and slope stability of a sand-geotextile capillary barrier retaining wall during exposure to rainfall with a 100-year return period. The results of the column infiltration tests show that the occurrence of breakthrough in the sand-geotextile capillary barrier is significantly delayed with increasing concentration of the urea-calcium chloride solutions. The enhanced capillary barrier effect is attributed to the increased water retention ability and reduced saturated permeability coefficient. The results of the parametric analysis show that the matric suction within the backfill is maintained and the factor of safety remains almost unchanged due to the EICP-enhanced sand-geotextile capillary barrier effect.

非织造土工布用于构造土工布毛细屏障，以最大程度地减少水的渗透。然而，由于低的保水能力和高的砂饱和渗透系数，可能会发生砂-土工织物毛细屏障的突破。为了解决这个问题，将酶促碳酸盐沉淀（EICP）技术应用于上覆的砂层，以改善其水硬性并增强砂土工布的毛细屏障。沉淀的碳酸钙具有通过覆盖土壤颗粒和填充土壤大孔而增强毛细屏障作用的潜力。为了研究EICP处理对砂土工布毛细屏障的影响，进行了三列测试，包括一根未经处理的砂土工布柱和两根经0处理的砂土工布柱。分别为5和1 mol / L的尿素-氯化钙溶液和大豆尿素酶液体。基于柱测试进行了瞬态渗流分析，以校准水力参数。进行了数值参数分析，以评估EICP增强对暴露于降雨的具有100年回归期的砂土工布毛细屏障阻挡墙的水力行为和边坡稳定性的影响。柱渗透试验的结果表明，随着尿素-氯化钙溶液浓度的增加，在砂土工布毛细管屏障中穿透的发生显着延迟。增强的毛细管屏障作用归因于增加的保水能力和降低的饱和渗透系数。