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冻融-干湿循环作用下土工合成黏土衬垫防渗性能
作者：陈彬1，王宝2，许健1，窦桐桐2，王楼3
（1.西安建筑科技大学 土木工程学院，陕西 西安 710055；
2.西安建筑科技大学 环境与市政工程学院，陕西 西安 710055；
3.中国城市建设研究院有限公司西安分院，陕西 西安 710065）
摘要：土工合成黏土衬垫（Geosynthetic Clay Liners，GCL）是废弃物处置场底部衬垫系统和上部覆盖系统建设中经常使用的一种材料。由于气候的周期性变化对GCL的防渗性能会造成一定的影响，分析了冻融循环和干湿循环作用下GCL渗透系数变化的内在机制及规律。膨润土黏土粒径及双电层变化是影响GCL渗透系数改变的主要原因，冻融循环对GCL防渗性能的影响较小，而干湿循环对GCL渗透系数的影响较大。
关键词：土工合成黏土衬垫；冻融循环；干湿循环；处置场；防渗性能
中图分类号：TU592 文献标识码：A 文章编号：1001-702X（2019）01-0128-06
Change law of hydraulic performance of geosynthetic clay liners under freeze-thaw and wet-dry cycling
CHEN Bin1，WANG Bao2，XU Jian1，DOU Tongtong2，WANG Lou3
（1.School of Architecture & Construction Engineering，Xi'an University of Architecture and Technology，Xi'an 710055，China；
2.School of Environmental & Municipal Engineering，Xi'an University of Architecture and Technology，Xi'an 710055，China；
3.China City Construction Research Institute Xi'an Branch，Xi'an 710065，China）
Abstract：Geosynthetic Clay Liners（GCLs）is a commonly material in the construction of composite bottom liner systems and cover systems for waste disposal sites. As periodic change of climate has some effect on the hydraulic performance of GCLs，the intrinsic mechanism and the trend of the change in hydraulic conductivity for GCLs under freeze-thaw and wet-dry cycling were reviewed in this paper. The changes in particles size and thickness of diffuse double layers primarily account for the changes in hydraulic conductivity of GCLs. Generally，the freeze-thaw cycling has relatively small effect on the hydraulic conductivity of GCLs. In contrast，the wet-dry cycling has significantly large impact on the hydraulic conductivity of GCLs.
Key words：geosynthetic clay liners，freeze-thaw cycling，wet-dry cycling，waste disposal site，hydraulic performance