Abstract:

South-to-North Water Transfer Project (SNWTP) is a mega infrastructure to solve water crisis in North China, its length is about 1 400 km, of which the section through the expensive soil is about 340 km 。 Centrifuge modeling tests which include three disposal plans of lining, replacement clay and weak swelling rock with geogrid were carried out to study the treatment effect based on existing research results, the impacts of the different replacement clay thicknesses were compared. The conditions of lining leaking, channel water transport all the year round and channel rapid dewatering were simulated, and the changes of vertical deformation, pore water pressures and earth pressure were recorded. Also, the PIV technique was adopted to capture soil displacements by image analysis. In this paper, the effects of different disposal plans for expansive soil slope were discussed and compared.