摘要
分别以自来水和0.05 mol/L的CaCl2溶液作为渗滤溶液研究带缺陷膨润土防水毯(GCL)的渗透性能。试验结果表明:自来水渗滤时,GCL的渗透系数随着缺陷直径的增大而增大,缺陷直径达11 mm时缺陷不能完全愈合,致使渗透系数超过1×10-9m/s。CaCl2溶液渗滤时,随着离子交换作用的进行,渗透系数随孔隙体积流量的增大有增大的趋势;缺陷直径小于5 mm时GCL具有一定的自愈能力,但增至7mm时缺陷不能愈合,溶液和缺陷的共同作用使得GCL的防渗性能很差。
The permeability of damaged geosynthetic clay liner （GCL） was studied by using the tap water and the 0.05mol/L CaCl2 solution as the percolating liquid, respectively. The results show that for the taper water, the hydraulic conductivity of the damaged GCL increases with the increase of hole diameter. The damaged GCL can not self-heal when the hole diameter reaches llmm, and the hydraulic conductivity will be larger than 1 ×10^-9m/s. For the 0.05mol/L CaCl2 solution, the hydraulic conductivity of the damaged GCL increases with the increase of pore volume flows due to ion exchange. The damaged GCL have certain self-healing capacity when the hole diameter is less than 5 mm and can not serf-heal when the hole diameter reaches 7 ram. The combined action of the solution and the defect results in poor permeability performance of the damaged GCL.
出处
《水利水电科技进展》
CSCD
北大核心
2011年第6期16-18,26,共4页
Advances in Science and Technology of Water Resources
基金
武汉市青年科技晨光计划(200950431166)
湖北省杰出青年人才项目(2010CDA091)
湖北省教育厅优秀中青年项目(Q20101408)
国家自然科学基金(51008120)
关键词
膨润土防水毯
防渗性能
自愈能力
渗透系数
孔隙体积流量
geosynthetic clay liner
permeability
self-bealing capacity
hydraulic conductivity
pore volume flow
