伴随着我国产业结构布局调整，涌现出大量重金属污染场地亟待修复，但目前对高浓度重金属污染土的固化缺少有效手段。本项目从环境岩土工程角度出发，提出联合三种工业固废“赤泥、电石渣、磷石膏”形成固化剂的新思路，围绕四种不同类型的重金属污染土，通过力学、渗透、电学、微观、光学等方法开展系统研究，开发适用于不同重金属类型的新型固化剂配方，掌握重金属污染固化土基本工程性质，提出固化土损伤演化的电阻率辨识理论，揭示赤泥、电石渣、磷石膏、黏土、重金属之间的相互作用机理，阐明固化过程对重金属离子形态变化的影响，建立重金属离子在固化土中迁移的对流-弥散-吸附-化学反应耦合模型，通过数值模拟探讨不同酸性环境下重金属离子的迁移转化规律，评价固化土的长期稳定性。研究成果对于高浓度重金属污染土的固化修复具有重要的理论指导意义，同时对于推动工业固废资源化利用也有着重要的现实意义。

With the adjustment of industrial structure layout in China, a large number of heavy metal contaminated sites need to be repaired urgently. However, the effective method is scanty. From the view of environmental geotechnical engineering, in this project, a novel thought of combined curing agent is putting forward, consisting of three kinds of industrial solid wastes, which are red mud, carbide slag and phosphogypsum. Based on four different types of heavy metal contaminated soils, the properties systematically will be studied by means of mechanics, infiltration, electricity, microscopy and optics, and a new solidifying agent formulation suitable for different types of heavy metals will be developed. The basic engineering properties of heavy metal contaminated solidified soils will be mastered. The resistance identification theory of damage evolution for solidified soils will be proposed. The interaction mechanism among red mud, carbide slag, phosphogypsum, clay and heavy metals will be revealed. The influence of solidification process on the morphological changes of heavy metal ions will be clarified. A coupled model of convection-dispersion-adsorption-chemical reaction for heavy metal ions migration in solidified soils will be established. The migration and transformation of heavy metal ions in different acidic environments will be discussed by numerical simulation, and the long-term stability of solidified soil will be evaluated. The research results are important theoretical guiding significance for the solidification and remediation of high concentration heavy metal contaminated soil, and is important practical significance for promoting the utilization of industrial solid waste resources.