Abstract: The replacement by cement modified expansive soil is one of the measures to cope with the slope failure caused by expansive deformation. Since the construction technology of cement modified expansive soil is complex, and the construction team lacks on-site experience, there are some difficulties and problems in the construction. Therefore, it was researched by the Chinese national “Twelfth Five-Year Plan” Science and Technology Support Program Construction Technology of Cement Modified Expansive Soil. According to the site investigation and construction of the expansive soil canal of Lushan-Zhengzhou segment of the middle route of South-to-North Water Transfer Project, the main difficulties in the construction, such as material source, construction technique, inspection method, and inspection criterion, are analyzed. Through field test and laboratory research, countermeasures and suggestions are put forward. The research results can be directly applied to the large-scale construction of expansive soil segment of the middle route of South-to-North Water Transfer Project.

Key words: South-to-North Water Transfer, expansive soil, cement modified expansive soil, construction technology