Long-Term Performance of GCLs Permeated with Aqueous Inorganic Solutions

GCL的长期性能：无机水溶液渗透的GCL的长期性能土工合成粘土衬垫（GCL）是工厂制造的水力屏障，由夹在两个土工织物之间或粘合到土工膜上的一薄层膨润土（~ 5.0 kg/m2）组成。自1992年以来，GCL因其相对较低的成本和对水的渗透率非常低（k 10 E-8 cm/s）而广泛用于水力密封应用。然而，大多数使用GCL的应用都涉及化学溶液的密封，这些溶液可能与GCL的膨润土部分不相容，并且大多数GCL渗透率测试的结果都是在相对较短的测试时间内完成的（例如，6个月）。因此，本研究的主要目的是评估土工合成粘土衬垫（GCL）的长期性能，土工合成粘土衬垫（GCL）渗透了无机水溶液，测试持续时间从6个月到10个月不等。本研究是科罗拉多州立大学（CSU）和威斯康星州大学麦迪逊分校（UWM）的联合努力。将测定GCL在暴露于蒸馏水和盐溶液渗透之前和之后的物理、水力和机械性能。该研究将包括测试，以评估长期的水力传导性，膨胀，剪切强度，和扩散性质的GCL。此外，CSU和UWM之间的交流计划将建立在教育和研究传播的基础上。这项研究的结果将推进我们对GCL长期行为的理解，并将影响涉及GCL的废物控制系统的设计。

Abstract9820863"Long-term Performance of GCLs: Permeated with Aqueous Inorganic Solutions"Shackelford, CharlesColorado State UniversityLong-Term Performance of GCLs Permeated with Aqueous Inorganic SolutionsGeosynthetic clay liners (GCLs) are factory-manufactured hydraulic barriersconsisting of a thin layer of bentonite (~ 5.0 kg/m2) sandwiched betweentwo geotextiles or bonded to a geomembrane. Since 1992, GCLs have been usedwidely in hydraulic containment applications because of their relativelylow cost and very low hydraulic conductivity to water (k 10E-8 cm/s).However, most applications using GCLs involve the containment of chemicalsolutions that may be incompatible with the bentonite portion of the GCLs,and the results of most hydraulic conductivity tests on GCLs are performedover relatively short test durations (e.g., 6 mos.). As a result, theprimary objective of this study, a joint effort between Colorado StateUniversity (CSU) and the University of Wisconsin at Madison (UWM), is toevaluate the long-term performance of geosynthetic clay liners (GCLs)permeated with aqueous inorganic solutions over test durations ranging from6 mos. to 3 yrs. Physical, hydraulic, and mechanical properties of the GCLsboth before and after exposure to permeation with distilled water and saltsolutions will be determined. The research will include tests to evaluatethe long-term hydraulic conductivity, swell, shear strength, and diffusionproperties of GCLs. In addition, an exchange program between CSU and UWMwill be established based for both educational and research disseminationpurposes. The results of this study will advance our understanding of thelong-term behavior of GCLs, and should impact the design of wastecontainment systems involving GCLs.