溶液特征对GCL膨胀和渗透特性的影响

Influence of Solution Characteristics on Swelling and Hydraulic Performance of Geosynthetic Clay Liner

摘要:

利用自由膨胀试验和渗透试验研究了溶液阳离子的离子价、浓度和水化离子半径对GCL(土工织物膨润土垫)中膨润土膨胀特性和GCL渗透性能的影响.试验结果表明溶液的这些特征均对GCL的膨胀性和渗透性有不同程度的影响：膨润土的自由膨胀量随着阳离子离子价和浓度的增大而逐渐减小，而GCL的渗透系数则逐渐增大；1价阳离子溶液的浓度对GCL的膨胀量和渗透系数影响显著，而2价或3价阳离子溶液浓度的影响较小；对于1价阳离子溶液，膨润土的自由膨胀量随着水化离子半径的增大而增大，而GCL渗透系数则随之减小.最后，根据研究结果和相关

Abstract:

The influence of solutions with different valence and concentration of cation and different hydrated ionic radiuses on swelling characteristics and hydraulic properties of geosynthetic clay liner (GCL) were explored using free swell tests and hydraulic conductivity tests. It is found that cation valence, concentration and hydrated ionic radius all have impacts on swelling and hydraulic performance of GCL. Test results indicate that the free swell of bentonite decreases,while hydraulic conductivity of GCL gradually increases with the increasing of cation valence and concentration; monovalent cation concentration has greater influence on GCL swell amount and hydraulic conductivity than that of the concentration of divalent or trivalent cations; the free swell amount of bentonite in monovalent cation solutions increases with the increasing of hydrated ionic radius, while hydraulic conductivity of GCL decreases with the hydrated ionic radius. Finally, the mechanical analyses on GCL swelling and hydraulic performance are made based on the related theory and experimental results.