半湿润区毛细阻滞覆盖层实际储水能力与防渗设计参数研究  

Water-storage capacity of capillary barrier cover in semi-humid areas and design parameters of anti-seepage

作　　者：莫加成 焦卫国[1,2] 赵青 庹斌[3] 罗宇 张松 MO Jiacheng;JIAO Weiguo;ZHAO Qing;TUO Bin;LUO Yu;ZHANG Song(College of Civil Engineering,Guizhou University,Guiyang 550025,China;Guizhou Institute of Technology,Guiyang 550003,China;Guizhou Zhongjian Architectural Research and Design Institute Co.,Ltd.,Guiyang 550006,China;Qianxinan Prefecture Urban Construction Investment(Group)Co.,Ltd.,Xingyi 562400,China)

机构地区：[1]贵州大学土木工程学院,贵州贵阳550025 [2]贵州理工学院,贵州贵阳550003 [3]贵州中建建筑科研设计院有限公司,贵州贵阳550006 [4]黔西南州城市建设投资(集团)有限公司,贵州兴义562400

出　　处：《岩土工程学报》2025年第5期968-976,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52069005,52268053);中建四局CSCEC4B-2020-KT-49;贵州理工高层次人才8XJGC2019091。

摘　　要：为掌握西北半湿润气候条件下毛细阻滞覆盖层长期服役性状和实际储水能力,在西安填埋场开展了现场足尺试验,通过极端降雨试验和长期监测自然气候条件下覆盖层的水力变化,定量对比了植被对覆盖层水分释放的影响,揭示了区域气候条件下毛细阻滞覆盖层实际渗漏模式及其储水能力发挥程度。结果表明:①西北半湿润区夏季植被生长茂盛的条件下,有植被时水分释放速度显著大于无植被裸土,前者累计释放量(45.80 mm)是后者(26.55 mm)的1.73倍。②中国西北半湿润气候区长时弱降雨气候条件,如小到中雨,毛细阻滞覆盖层渗漏时实测储水量约为理论储水量的93%。土层裂缝等优先流通道对其防渗性能影响小,渗漏诱发原因是土层实际储水量超过理论值。短时强降雨气候条件,如夏季午后的大到暴雨,渗漏时实测储水量约为理论储水量的73%~84%。坡面径流(或积水)通过土层裂缝优先下渗是覆盖层多发的、常见的渗漏诱发机制。防渗设计中,建议在储水理论值基础上考虑1.1~1.3的防渗富余系数。To investigate the service behavior and water-storage capacity of capillary barrier cover systems in semi-humid areas of northwest region of China,a full-scale cover system is constructed in Xi’an,and the rainfall and long-term serviceability monitoring tests are conducted.The results show that:(1)Under lush vegetation growth in summer,the water release rate with vegetation is significantly higher than that without vegetation,with the former(45.80 mm)being 1.73 times greater than the latter(26.55 mm).(2)Under light to moderate rainfall conditions in the northwest region,the measured water-storage capacity is approximately 93%of the theoretical one.The soil cracks and other preferential flow pathways have the minimal impact on the impermeability performance,with leakage primarily occurring when the actual water-storage capacity exceeds the theoretical value.During short bursts of heavy rainfall,the measured water-storage capacity is approximately 73%to 84%of the theoretical one.The soil cracks preferentially infiltrating are a common and frequent induction mechanism for leakage in the soil cover layer.This may result in the inadequate utilization of water-storage capacity of soil.It is suggested that a safety margin coefficient of 1.1 to 1.3 should be considered to enhance impermeability.

关 键 词：半湿润气候 毛细阻滞覆盖层 防渗 储水能力 诱发机制 裂缝 

分 类 号：TU47[建筑科学—结构工程]