Abstract: The comprehensive investigations indicate that a largescale regional ground subsidence is developing along the Zhengxu Passenger Rail Line induced by the excessive groundwater extraction. These ground subsidence cones are formed centered at the urban area. The geological and hydrogeological characteristics of the soil strata along the rail alignment, groundwater extraction conditions, change of seepage boundary conditions due to the groundwater extracting are evaluated. The groundwater level change was simulated by using Visual Modflow software so that the groundwater seepage field, limits of the settlement cone induced by the groundwater level changes could be obtained. Based on the simulation results, areas with severe ground subsidence potential were instrumented and monitored to provide long term data for the safe operation of the passenger rails.

Key words: Zhengxu Passenger Rail Line, Regional Ground Subsidence, Prediction and Evaluation, Impact Analysis, Engineering Measures