ABSTRACT
ABSTRACT: The foundation pit dewatering has an important position in the construction process of deep foundation pit; and the selection of diaphragm wall of foundation pit and dewatering scheme and their rationality of the design have a great impact on the project quality, construction period and project cost. On account of some problems in the existence of diaphragm wall of deep foundation pit and dewatering scheme design currently, the deep foundation pit dewatering scheme in the complex formation condition is optimized and designed with multi-index evaluation method by combining the deep foundation pit dewatering project of Puzhu Road station of Nanjing Metro Line 3, and the conclusion is drawn. The calculation result shows that: Scheme I is optimum dewatering scheme, the buried depth for bottom of diaphragm wall of foundation pit is 41.5m, and the buried depth of 15 filters arranged inside the foundation pit is 22-37m of pumping well. This scheme can let the groundwater level meet the excavation requirement during rainfall, and the number of land subsidence outside the foundation pit is within the controllable scope. After comparison with the actual observed value, the built groundwater seepage model is reasonable, and the calculation result is correct and reliable, which has a certain reference value to the deep foundation pit dewatering project design.
