液体对土工织物膨润土垫膨胀性和渗透性的影响

近年来土工织物膨润土垫（GCL）被越来越多地应用到各种防渗工程中，它的膨胀性和渗透性也成为了设计人员和研究人员所关注的焦点。通过水化膨胀试验、自由膨胀试验和渗透试验，研究了液体对GCL膨胀性能和渗透性能的影响以及膨胀性和渗透性之间存在的相关关系。试验结果表明, 水化液和渗透液的种类对GCL的膨胀性和渗透性有很大影响，其影响分别为：(1) 水化液相同时，渗透液的种类对GCL的渗透系数有影响，而渗透液相同时，水化液的种类对GCL的渗透系数也有影响；(2) GCL的水化膨胀量和渗透系数之间存在相关关系，水化膨胀量越大，渗透系数就越低；(3) GCL中膨润土的自由膨胀量和GCL的渗透系数之间也存在相关关系，自由膨胀量越大，GCL的渗透系数就越低。

Influence of liquids on swelling characteristics and hydraulic properties of heosynthetic clay liners

Recently, geosynthetic clay liners (GCL) were more and more used in different anti-seepage engineering projects; and their swelling characteristics and hydraulic properties become a focus of designers and researchers. The influencing of liquids on swelling characteristics and hydraulic properties of GCL, as well as the relationship between swelling characteristics and hydraulic properties, were researched through hydration swell tests, free swell tests and hydraulic conductivity tests. It was found that hydration liquid and permeation liquid had influences on swelling characteristics and hydraulic properties of GCL. Test results have shown that: (1) the hydraulic conductivity of GCL was influenced by permeation liquids when hydration liquid was the same; and the hydraulic conductivity of GCL was also influenced by hydration liquids when permeation liquid was the same; (2) there was a relationship between hydration swells and hydraulic conductivities; the bigger the hydration swells, the lower the hydraulic conductivities; (3) there was also a relationship between free swells and hydraulic conductivities, the bigger the free swells, the lower the hydraulic conductivities.