Relationship between building density and land subsidence in Shanghai urban zone

The engineering construction gradually becomes the new factor for causing the land subsidence in Shanghai in recent year. Four typical sections of high\|rise and tier building dense area are selected, and the relationships between density and land subsidence are analyzed, and their space\|time change character is also discussed in this paper. The construction scale and its developing speed are directly caused the land subsidence in the meantime. The land subsidence effect is obvious just as centralized construction is bigger than dispersed construction, new area construction is bigger than old inhabited area, high\|rise building is bigger than low\|rise building. In other words, the land subsidence is remarkable in high construction density and high building volumetric fraction. The urban planning may choose the construction way of low dense and low volumetric fraction, may lower the building height, and may enlarge the distance between two buildings. The feasible building volumetric fraction is 0 9～1 2 under the land subsidence control, it may provide a technique index for urban planning.