Influence of swelling on permeability of geosynthetic clay liner
Geosynthetic clay liner(GCL)has good water-absorbing and swelling properties,and is widely used as an imper-meable material in environmental engineering and water conservancy projects.The amount of swelling of the GCL is affected under loads.The relationship between the load and the amount of swelling and the effect of swelling on the permeability coefficient were investigated using expansion and permeability tests.The results show that the swelling of GCL decreases significantly with the in-crease of load,and almost no swelling occurs after the load exceeds 1000 kPa.The permeability of GCL decreases with large swelling,and the permeability coefficient increases by one order of magnitude when the swelling reaches 12 mm.Based on the ex-pressions of the fitted swelling amount and overlying load,swelling amount and permeability coefficient,the swelling amount and permeability coefficient at different stacking heights were calculated.It was suggested that GCL could be covered with 0.2 m of sand or soil to improved the safety of geosynthetic clay liner.
万方数据
维普
