地下水污染源带粘土基垂直阻截墙兼容性研究

预防和控制是地下水污染防治经济、高效的手段，随着我国地下水污染治理工作的深入，更多的污染场地需要进行地下水污染的阻断，地下水污染的垂直阻断技术越来越会受到重视。因此，研究地下水污染垂直阻断在实际应用中存在的技术难题意义重大。未污染地下水的防渗阻断技术已经成功应用于水利工程等领域，但在污染严重的地下水污染源带，由于地下水中污染物与阻截介质的各种作用，有可能导致污染阻截的失效。本项目针对地下水污染阻断中常用的粘土基垂直阻截墙技术，模拟我国地下水污染中存在的极端酸、碱环境条件，高污染负荷情形，研究污染物与不同配比的粘土基阻截墙介质的作用机理、兼容性能及强化机制，明确地下水污染粘土基垂直阻截墙实际应用的安全性，为提升污染阻断性能提供技术支撑；构建污染物流体与粘土基垂直阻截墙兼容性的评判方法和模型，为阻截墙长期有效性评价奠定基础，对预防地下水污染阻断“失效”带来的污染风险具有重要意义。

Precaution and control are the most effective and economic measures for groundwater pollution. Vertical engineering barrier(VEB) is considered as one of the most important techniques for groundwater plume control. Therefore, it is very important to study the difficulties that may occur in the application of VEB technology. VEB for uncontaminated groundwater has been used successfully in the water conservancy engineering, but the compatibility problem between contaminated groundwater and barrier materials may influence the block effect and even cause the failure of the barrier in the heavily polluted source zone. The major research contents and objectives of this project are as follows: to study the reaction mechanisms and compatibilities between clay based VEB and the heavily polluted groundwater under different extreme acid-base environments, which can provide theoretical bases for the application of VEB system; to built the compatibility evaluation methods and models for VEB regarding to contaminated fluids, which can lay the foundation for the long-term effect assessment of VEB system.