Abstract The self-healing of a GCL with artificial defects (circular holes and rectangular slits, both with and without the carrier geotextile preserved below the holes) upon hydration on a Godfrey silty sand (GSS) subgrade with wfdn = 5, 10 and 16% under 2–100 kPa is examined. Circular holes with the carrier geotextile missing below holes with diameters up to 25.4 mm self-healed on the wfdn = 5% and 10% GSS but not on 16% GSS, while none self-healed when carrier geotextile was preserved below the holes. When DI water was introduced to the surface under 100 kPa, circular holes with diameter up to 38.1 mm self-healed. Neither the single 15 mm-wide slit nor double 15 mm-wide parallel slits with 20 mm-wide strip of undamaged GCL between them resting on wfdn = 10% GSS under 20 kPa fully self-healed. The introduction of simulated synthetic landfill leachate (SSL) to the GCL surface under 70 kPa did not result in self-healing. Post-hydration k tests found that GCL without a carrier geotextile below a hole up to 25.4 mm in diameter would not have a significant adverse effect on the hydraulic conductivity compared with an intact GCL provided the permeant was tap water rather than SSL.

中文翻译：

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外加应力下粉质砂水化后 GCL 中圆形和狭缝缺陷的自修复

摘要 在 wfdn = 5、10 和 16% 的 Godfrey 粉质砂 (GSS) 路基上水化后，具有人工缺陷（圆形孔和矩形狭缝，有和没有保留孔下方的载体土工布）的 GCL 的自修复检查低于 2-100 kPa。在直径达 25.4 毫米的孔下，带有载体土工布的圆形孔在 wfdn = 5% 和 10% GSS 上自愈，但在 16% GSS 上没有，而当载体土工布保留在孔下方时没有自愈。当在 100 kPa 下将去离子水引入表面时，直径达 38.1 mm 的圆形孔会自愈。无论是单 15 毫米宽狭缝还是双 15 毫米宽平行狭缝，它们之间都有 20 毫米宽的未损坏 GCL 条带，它们搁在 wfdn = 10% GSS 上，在 20 kPa 下完全自愈。在 70 kPa 压力下将模拟合成垃圾渗滤液 (SSL) 引入 GCL 表面并没有导致自愈。水化后 k 测试发现，与完整的 GCL 相比，如果渗透剂是自来水而不是 SSL，那么在直径达 25.4 毫米的孔下方没有载体土工织物的 GCL 不会对水力传导率产生显着的不利影响。