This paper investigates the occurrence of internal erosion and the variation of the permeability of geosynthetic clay liner (GCL) with respect to its geotextile component, polymer type and polymer amount added to its bentonite component, hydraulic head, and subgrade material by performing extensive triaxial permeability tests on the GCL specimens. To do this, Na carboxymethyl cellulose (CMC) and polyacrylamide (PAM) were treated with the bentonite component of the GCLs. Then, the GCLs were placed over poorly graded gravel (GP) and poorly graded sand (SP). Consequently, they were tested with two different woven geotextile components under the hydraulics heads of 0.3 m and 10 m. Results showed that only GCLs tested with woven geotextile, having lower tensile strength, lower mass/area and lower thickness over the gravel at a hydraulic head of 10 m, experienced internal erosion. Critically, Na CMC and PAM treatment caused 2–2.5 orders of magnitude decrease in the permeability. Actually, 2% Na CMC and 1% PAM treatment by dry mass were found to be the optimum polymer contents. Both the environmentally friendly biopolymer Na CMC and the synthetic polymer PAM can effectively be treated with Ca bentonite to enhance the hydraulic performance of the GCLs.

本文通过广泛的三轴渗透研究，研究了土工合成粘土衬垫（GCL）的内侵蚀发生情况以及渗透率随土工织物成分、膨润土成分、水头和路基材料中添加的聚合物类型和聚合物用量的变化。对 GCL 样品进行测试。为此，用 GCL 的膨润土成分处理羧甲基纤维素钠 (CMC) 和聚丙烯酰胺 (PAM)。然后，将 GCL 放置在级配较差的砾石 (GP) 和级配较差的沙子 (SP) 上。因此，他们使用两种不同的机织土工织物组件在 0.3 m 和 10 m 的水头下进行了测试。结果表明，只有使用机织土工布进行测试的 GCL 具有较低的在 10 m 的水头下，砾石的抗拉强度、较低的质量/面积和较低的厚度，经历了内部侵蚀。至关重要的是，Na CMC 和 PAM 处理导致渗透性降低 2-2.5 个数量级。实际上，按干质量计算，2% Na CMC 和 1% PAM 处理是最佳聚合物含量。环保生物聚合物Na CMC和合成聚合物PAM都可以有效地用Ca膨润土处理，以提高GCL的水力性能。