目前,垂直防渗技术广泛应用于缺少水平防渗的非正规垃圾填埋场和周边环境敏感度较高的新建填埋场中.垂直防渗帷幕可有效阻隔填埋垃圾中污染物与地下水土的联系,减少环境污染风险.以某新建飞灰填埋场为例,利用COMSOL仿真软件对防渗墙进行渗流分析,对比防渗墙类型、墙体厚度、墙体深度等因素对防渗效果的影响,定量评价垂直防渗帷幕的防渗性能.最终确定该填埋场垂直防渗采用水泥-膨润土-土防渗墙的形式,墙体厚 0.8 m,将微风化岩层作为相对不透水层,墙体插入微风化岩层 2～4 m.
Analysis of the Vertical Anti-seepage Scheme for a Landfill Based on COMSOL
At present,vertical anti-seepage technology is widely used in informal landfills lacking horizontal anti-seepage and new landfills with high sensitivity to surrounding environment.Vertical anti-seepage curtains can effectively block the connection between pollutants in landfill waste and underground water and soil,and reduce the risk of environmental pollution.Taking a new fly ash landfill as an example,COMSOL simulation software was used to analyze the sewerage of the anti-sewerage wall,compare the influence of factors such as the anti-seepage wall type,wall thickness,and wall depth on the seepage prevention effect,and quantitatively evaluate the seepage prevention performance of vertical anti-seepage curtains.Finally,the vertical anti-seepage of the landfill was determined to adopt the form of cement-bentonite-soil anti-seepage wall,with the wall thickness of 0.8 m.The slightly weathered rock layer was used as a relatively impervious layer,and the wall was inserted 2-4 meters into the rock layer.
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