湿润地区垃圾填埋场蒸发蒸腾覆盖层参数分析

›› 2012, Vol. 33 ›› Issue (S1): 283-289.

湿润地区垃圾填埋场蒸发蒸腾覆盖层参数分析

邱清文¹，张文杰¹，程泽海²

1. 上海大学土木工程系，上海 200072；2. 浙江科技学院建筑工程学院，杭州 310023

收稿日期:2011-10-09 出版日期:2012-09-11 发布日期:2012-09-21
通讯作者: 张文杰，男，1978年生，博士，副教授，主要从事岩土工程方面的研究工作。E-mail: WJZhang2006@shu.edu.cn E-mail:qiuqingwen105@163.com
作者简介:邱清文，男，1986年生，硕士研究生，主要从事岩土工程方面的研究工作。
基金资助:
国家自然科学基金资助项目（No. 50908140，No. 51178260）；上海大学研究生创新基金资助项目（No. SHUCX112339）

Parametric analyses of evapotranspiration landfill covers in humid areas

QIU Qing-wen¹, ZHANG Wen-jie¹, CHENG Ze-hai²

1. Department of Civil Engineering, Shanghai University, Shanghai 200072, China; 2. Institute of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou 310023, China

Received:2011-10-09 Online:2012-09-11 Published:2012-09-21

摘要/Abstract

摘要： 蒸发蒸腾覆盖层相比传统覆盖层有许多优势，目前这种覆盖层主要应用于干旱和半干旱地区，但研究湿润地区垃圾填埋场蒸发蒸腾覆盖层的水分运移规律和工作性能很有必要。通过二维饱和-非饱和模型，分析覆盖层厚度、土壤类型、植被条件、气候条件等设计参数对蒸发蒸腾覆盖层防渗性能的影响，并对覆盖层中的水分运移规律及其工作性能和适用性进行研究。研究结果表明，随着覆盖层厚度和叶面积指数LAI增加，蒸发蒸腾覆盖层的最终透水量（穿过覆盖层水分）呈减小趋势，但覆盖层厚度和叶面积指数较大时透水量减小趋势不明显；拥有较大储水能力和适当渗透系数的覆盖层能够有效地减少透水量；降雨的季节性分布对蒸发蒸腾覆盖层性能有很大影响，当多雨期与高温期分布一致时，蒸发蒸腾覆盖层的性能可满足设计要求；在非饱和条件下，毛细阻滞型覆盖层利用粗-细粒土之间水力特性的差异形成毛细阻滞效应减少水分向下入渗，其防渗性能优于单一土层型覆盖层，但在不利气象条件组合下，该毛细阻滞作用可能失效, 其防渗性能将大大下降。

关键词: 蒸发蒸腾覆盖层, 湿润地区, 参数分析, 毛细阻滞

Abstract: Evapotranspiration covers offer a number of potential advantages over conventional covers. But they are mainly used in arid and semiarid areas. Analyses of water movement and performance of evapotranspiration covers of landfills in humid regions become interesting. Influences of design parameters such as cover thicknesses, soil types, LAI and climate factors on performance of evapotranspiration covers were investigated by using a two-dimensional saturated-unsaturated flow model. Water movement, performance and applicability of evapotranspiration covers were evaluated. The results show that final percolation decreases with an increasing cover thickness and an increasing LAI. But their influence becomes inapparent when they are relatively large. Cover soils with a large storage capability and a moderate hydraulic conductivity are most effective to minimize percolation. Seasonal distribution of precipitation has a great influence on performance of evapotranspiration covers. The performance of evapotranspiration covers can meet design requirements when most of rainfalls companying with high temperature in a humid region. Capillary covers are more efficient than monolithic covers to minimize percolation under unsaturated condition because of a capillary break caused by the differences in the unsaturated hydraulic conductivity between finer-grained layer and coarser-grained layer. However, the performance of capillary covers will dramatically reduce under bad climatic combination when capillary break fails.

Key words: evapotranspiration covers, humid areas, parametric analyses, capillary break

中图分类号:

S 274

邱清文，张文杰，程泽海 . 湿润地区垃圾填埋场蒸发蒸腾覆盖层参数分析[J]. , 2012, 33(S1): 283-289.

QIU Qing-wen , ZHANG Wen-jie , CHENG Ze-hai . Parametric analyses of evapotranspiration landfill covers in humid areas[J]. , 2012, 33(S1): 283-289.

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