| 垃圾填埋场抽水试验及降水方案设计 |
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| 引用本文： | 张文杰,陈云敏.垃圾填埋场抽水试验及降水方案设计[J].岩土力学,2010,31(1):211-215. |
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| 作者姓名： | 张文杰 陈云敏 |
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| 作者单位： | 1. 上海大学,土木工程系,上海,200072;浙江大学,岩土工程研究所,杭州,310058
2. 浙江大学,岩土工程研究所,杭州,310058 |
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| 基金项目： | 国家自然科学基金，上海大学创新基金，上海市优秀青年教师科研专项基金 |
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| 摘 要： | 垃圾填埋场中的渗滤液水位过高会引发一系列环境和稳定问题,工程上可用竖井抽水降低渗滤液水位。通过在填埋场现场进行抽水试验,确定垃圾土的渗透系数和抽水影响半径,在此基础上对填埋场降水的瞬态流问题进行有限元模拟,分析了抽水井口径和间距对填埋场降水的影响,提出了降水方案的设计步骤和方法。抽水试验表明,现场垃圾的渗透系数约为3.6×10-4cm/s,抽水影响半径约为20m。数值分析表明,井径的变化对于降水效果影响不大,而合理选择抽水井间距对降水十分关键。进行抽水方案设计时,应首先根据工期和降水幅度要求计算井间距,按井的出水速度选择水泵,再根据水泵确定井径,最后根据井径和过滤层形式确定钻孔尺寸并选择钻机。
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| 关 键 词： | 垃圾填埋场 抽水试验 填埋场降水 瞬态流分析 井径 井距 |
| 收稿时间： | 2008-08-11 |
Pumping tests and leachate drawdown design in a municipal solid waste landfill |
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| ZHANG Wen-jie,CHEN Yun-min.Pumping tests and leachate drawdown design in a municipal solid waste landfill[J].Rock and Soil Mechanics,2010,31(1):211-215. |
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| Authors: | ZHANG Wen-jie CHEN Yun-min |
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| Institution: | 1. Department of Civil Engineering, Shanghai University, Shanghai 200072, China; 2. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310027, China |
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| Abstract: | A number of environmental and stability issues can be caused by a high leachate level in a landfill. Vertical pumping wells can be used to lower the high leachate level. Pumping tests were conducted at a municipal solid waste landfill. Finite element analyses were carried out to simulate the transient flow problem of leachate drawdown. The pumping test gives a hydraulic conductivity of 3.6×10-4cm/s and an influenced radius of about 20m. The numerical analyses show that radius of the pumping well has only a little impact on the pumping efficiency, whereas spacing of the wells is critical to the leachate drawdown. To design a drawdown scheme, spacing of the wells should be determined first considering the demand and time limit of the project. The pump should be selected based on the pumping rate. The radius of the pumping well is then determined by the size of the selected pump. Finally, filter, size of the borehole and type of borer should be determined in sequence. |
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| Keywords: | solid waste landfill pumping test leachate drawdown transient flow analyses radius of wells spacing of wells |
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