Pumping Test and Numerical Simulation in an Excavation Engineering

The design scheme of a project in Yichun, Jiangxi Province involved karst landform and ancient river and did not fully consider the impact of groundwater. The large-scale settlement and cracks were begot around the excavation which accompanied construction dewatering. The foundation pit was forced to backfill above the groundwater level. In order to ensure the safety of the surrounding environment of the foundation pit during the secondary excavation, it was necessary to re-formulate the groundwater control scheme. The foundation pit dewatering numerical simulation was carried out by using the field pumping test data, geological survey data and Midas GTS finite element numerical analysis. The final groundwater control scheme was determined after the comparison of safety and economy. The excavation engineering should considered the groundwater conditions and the surrounding environment, and could be tested by the numerical simulation. Combining pumping test and numerical simulation, different groundwater control schemes were analyzed and reasonable design scheme was proposed. This method has certain reference significance to the foundation pit dewatering project under the complex hydrogeological condition.