Abstract: To ensure the quality and safety of the formal construction of the permanent and temporary integrated prefabricated underground diaphragm wall, tests are conducted on the model components of the prefabricated underground diaphragm wall, and the assembly process and the grouting process of the inter-width joints are summarized, addressing the construction control issues of the fine-length and large-tonnage prefabricated underground diaphragm wall components. Single CT and double CT components are used as the joint structure of the model members of the underground diaphragm wall, field tests are carried out to check the processing quality of the joint structure of the members, and the assembly control measures are summarized. Through the installation test of the underground diaphragm wall model, the influence of different joint combination forms, U-shaped strip bag structure, CT connection structure, C filling material, and concrete forming quality on the component assembly is examined. The grouting effect of geopolymer and high-strength cement-based special grouting materials is analyzed according to the key parameters such as grouting time, consumption, and amount of staggered joints at different depths. The results show that: (1) Single CT component is easier to assemble than double CT component. (2) The use of geopolymer for CT grouting can satisfy the grouting effect while reducing consumption of grouting materials and improving the grouting efficiency.

Key words: permanent-temporary integration, prefabricated underground diaphragm wall, model test