竖井抽水下垃圾填埋场渗滤液运移规律研究

柯瀚; 胡杰; 吴小雯; 孟猛

doi:10.11779/CJGE201805002

竖井抽水下垃圾填埋场渗滤液运移规律研究 English Version

柯瀚^{1, 2},
胡杰^1,2,,
吴小雯³,
孟猛^{1, 2}

1. 浙江大学软弱土与环境土工教育部重点实验室,浙江杭州 310058;
2. 浙江大学岩土工程研究所,浙江杭州 310058;
3. 杭州市城乡建设设计院股份有限公司,浙江杭州 310004

详细信息

作者简介:
柯瀚(1975- ),男,教授,博士生导师,主要从事基础工程和环境土工方面的教学和科研工作。E-mail: boske@126.com。

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出版历程
- 修回日期: 2017-03-20
- 发布日期: 2018-05-24

Investigation into leachate transport in MSW landfills under pumping of vertical wells

KE Han^{1, 2},
HU Jie^1,2,,
WU Xiao-wen³,
MENG Meng^{1, 2}

1. MOE Key Laboratory of Soft Soils and Geoenviromental Engineering, Zhejiang University, Hangzhou 310058, China;
2. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
3. Hangzhou Urban & Rural Construction Design Institute Co., Ltd., Hangzhou 310004, China

摘要

摘要: 城市固废由于组成成分的多样性及分层填埋等原因,导致渗滤液运移存在明显的优先流及各向异性现象。在成都某填埋场开展多口竖井抽水及水位恢复试验,同时结合高密度电法技术（ERT）现场大尺度研究渗滤液分布及运移规律。多口竖井水位恢复试验显示填埋体内渗滤液运移具有明显的不均质性,表现为同一填埋场不同位置的竖井抽排性能差异较大,竖井周围垃圾渗透系数值分布范围为2.35×10^-5~3.90×10^-4 cm/s。竖井抽水下周围监测井的水位异常变化表明渗滤液补给存在明显优先流特征。ERT监测渗滤液抽水及回灌过程中堆体内电阻率变化,进一步揭示了现场渗流存在显著的各向异性和优先流特征,主要渗流路径与水平向呈0~30°。
- 填埋场 /
- 竖井 /
- 渗滤液运移 /
- 优先流 /
- 各向异性 /
- 高密度电法
Abstract: Owing to the composition diversity of MSW and the compacted nature in landfills, the leachate transport in landfills is found to be dominated by the preferential flow and shows significant anisotropy (i.e., horizontal permeability higher than vertical one). The vertical well pumping and leachate level recovery tests are conducted at Chengdu landfill. Meanwhile, the leachate distribution and transportation characteristics are examined quantitatively and qualitatively using electrical resistivity tomography (ERT). Through the vertical well pumping and leachate level recovery tests, it is found that the leachate transport in landfills is highly heterogeneous. The performance of vertical wells at different regions of this landfill shows great difference, and the hydraulic conductivity of the surrounding waste ranges from 2.35×10^-5 to 3.90×10^-4 cm/s. The leachate levels in the surrounding monitoring wells change unusually under pumping of vertical wells. It is mainly due to the existence of preferential flow in the leachate transportation process. In addition, the monitoring results on changes of waste resistivity in the process of leachate pumping and recirculation by ERT further reveal that there are significant anisotropy and preferential flow characteristics in leachate transportation. And the angle between leachate seepage path and horizontal direction is found to be 0~30°.
- landfill /
- vertical well /
- leachate transport /
- preferential flow /
- anisotropy /
- ERT

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参考文献(21)

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