Study on the Permeability of GCL Materials in Coupled Environment

Abstract

Abstract As a new-type anti-seepage material, Geosynthetic Clay Liner (hereinafter referred to as GCL) has been applied in various anti-seepage projects and achieved good benefits. Based on different salt solution types, concentrations, dry-wet, and freeze-thaw cycles, this paper designs a permeability test of GCL after aging, and the result shows that: (1) under the influencing factors of single salt solution, there is a threshold concentration of 0.15 mol/L, which means that the increase rate of GCL permeability coefficient suffers a significant decrease above this concentration. (2) With fewer numbers (<4 ) of dry-wet cycles the GCL permeability coefficient shows faster growth and then returns gradually to stability. (3) Compared with dry-wet and freeze-thaw environments, cation concentration and valence have a more prominent inhibition effect on the anti-seepage property of GCL. The research results can provide data reference and reasonable advice for the deterioration of various indicators of GCL material and its service life in corresponding projects in saline soil areas.