CONTRAST TESTS IN SITU OF CEMENT-SOIL WALLS BY TRD OR SMC IN THE FOUNDATION EXCAVATION OF LARGE PUBLIC BUILDINGS AND THEIR JOINT FACILITIES FOR THE CENTRAL GREEN IN BEIJING

In the light of many monuments and metro lines around the excavated foundation of the large public landmark buildings and their joint facilities for the Central Green in Beijing Municipal Administrative Center,the underground pedestrian passage of the Grand Theatre for Beijing Municipal Administrative Center passing below it,as well as in considerations of complex engineering geology and hydrogeology and the complexity of construction,the cement-soil walls by the trench cutting remixing deep wall method (TRD) were proposed to be adopted in Beijing first to control groundwater of the project. Comparisons of sealing effects for the cement-soil walls by TRD and the soil-mixing with cutters (SMC) showed curtains by TRD had better performances of isolating groundwater than that by SMC. The construction processes of SMC needed to be improved further.