Abstract: To alleviate the pressure on the urban land caused by national economic developments, the construction industry has gradually developed towards the construction of highrise and super highrise buildings. China’s geological conditions are complicated, which requires a higher standard for the bearing capacity and the deformation of foundation soils. This paper presents a highrise building project of a liquefiable soft soil site in Chengdu area as a case history. A numerical model by using software Midas GTS NX to predict the postconstruction settlement deformation of building is established. After the completion of the project, comparing the load test and the settlement monitoring data of binary composite foundation, the measured data and the numerical simulation results are basically consistent, and the bearing capacity and deformation of foundation soils meet the requirements. The results show that in the field of sandy and silty liquefiable soft soils, the application of gravel columns, the Cement, Fly ash and Gravel (CFG) column composite foundation has remarkable effect on eliminating the liquefaction potential and improving the bearing capacity of foundation soils.

Key words: Binary Composite Foundation, Numerical Model, Liquefiable Soft Soil