Abstract: The excavation method is widely used in contaminated soil remediation projects, but the pit formed by contaminated soil excavation is significantly different from the traditional construction of deep excavation projects. In the view of the dual engineering-environmental attributes of excavation for contaminated soil remediation, this paper systematically analyzes the characteristics of contaminated soil excavation projects, including the irregularity and uncertainty of the excavation scope, the risk of secondary pollution, and the sustainability of land reuse. It proposes technical requirements for support design centered on dynamic design, pollution prevention and control, and green construction. A comprehensive technical route for the design of contaminated soil excavation pits is established, encompassing “data collection, determination of excavation scope and depth, foundation pit support design, foundation pit seepage prevention and drainage design, earth excavation, foundation pit monitoring and inspection, and earthwork backfilling.” This paper summarizes common support methods and design essentials for contaminated soil excavation pits. The research results can provide reference for the design of excavation pits for contaminated soil remediation, promote the extension of foundation pit support technology to environmentally sensitive scenarios, and facilitate the restoration, regeneration, and sustainable development of land resources.

Key words: Deep Excavation, Excavation Support Design, Remediation of Contaminated Soil, Excavation of Contaminated Soil, Green Deep Excavation Methods