Abstract: In order to provide decision-making basis for prevention and control of land subsidence in Shengze of Wujiang, the authors analyzed the influence of building load and groundwater exploitation on land subsidence. Based on the Biot's consolidation theory and ground water seepage theory, a three-dimensional fully coupled mathematical model of building load, groundwater exploitation on land subsidence was established. By using this model, the trend of land subsidence was simulated from 2015-09-01 to 2030-08-31 under the conditions of only building load, only groundwater exploitation, and the superposition of building load and groundwater exploitation. According to the prediction results, the effect of building load on land subsidence in Shengze is greater than that of groundwater exploitation. With the first weak clayed soil aquifer and the first confined aquifer as the main compressible layers, under the individual action, the single-layer compression accounted for 43.04% and 54.06% respectively; while with the first confined aquifer and its overlying weak clay soil aquifer as the main compression layer of the superposition of the building load and the groundwater exploitation, the total compression amount accounted for 71.30% of the total compression. The sum of the linear superposition of ground subsidence caused by the building load and groundwater exploitation alone is larger than the ground subsidence caused by the superposition of the two.The land subsidence caused by the superposition of the building load and the groundwater exploitation has a coupling effect.

Key words: Shengze, Wujiang, building load, groundwater exploitation, land subsidence, coupling effect