多重竖向隔离屏障在污染场地中的应用研究

Application study of multiple vertical isolation barriers in the contaminated site

针对污染场地竖向隔离技术,当前研究主要集中在垂直屏障的隔离材料、服役性能、施工工艺及修复应急措施等方面,对隔离屏障的现场设计及施工形式的研究相对较少。基于土壤中污染物迁移机理,提出了一种多重竖向隔离屏障的设计理念及施工方法,将污染物的渗流作用、弥散作用及吸附作用区分,引入缓冲层概念,旨在提高隔离屏障的服役年限。通过理论分析和有限元模拟,对多重竖向隔离屏障的服役效果进行评价,发现相比传统的同厚度单层竖向隔离屏障,多重竖向隔离屏障系统能够更好地阻隔污染物的迁移,明显提高竖向屏障的长期服役性能。将提出的多重竖向隔离屏障应用于某实际工程中,结合监测结果,发现该屏障系统能够满足该工程的实际需求。

The current research of vertical isolation technology in contaminated site mainly focuses on the isolation materials,service performance,construction technology,and emergency response measures of vertical barriers.There are relatively few studies on the design and construction of isolation barriers.Based on the migration mechanism of pollutants in soil,a design concept and construction method for multiple vertical isolation barriers is proposed.The seepage,dispersion and adsorption effects of pollutants were differentiated and introduced into the buffer layer concept to extent the service life of isolation barriers.Through theoretical analysis and finite element simulation,the service effect of multiple vertical isolation barriers was evaluated.It is found that multiple vertical isolation barrier systems could block better the migration of pollutants compared to the traditional single-layer vertical isolation barrier with the same thickness,and obviously improve long term service performance.The multiple vertical barrier system could meet the project requirement according to the application in a project based on the monitoring results.