宁波轨道交通某车站深基坑工程承压水降压抽水试验及数值模拟

摘要

To reduce the design risk during deep foundation pit construction, it is necessary to take a dedicated pumping test to determine the parameters of various geological layers at the pit, especially those of the confined aquifer. In relation to the complicated hydro-geological conditions at deep foundation pit in Ningbo City Metro, and by way of various hyper pumping tests under different lower pressure regimes, a model is established on the pumping test by means of three-dimensional unsteady flow finite differentiation method and the hydro-geological analysis. This conclusion of the pumping test and findings of expert examination could provide relevant technical support for the design and construction of rail transit lines in Ningbo City.%为降低深基坑工程由于地下水诱发的风险,有必要通过抽水试验确定各地层(特别是承压含水层)的水文地质参数.针对宁波轨道交通某车站深基坑工程,首先通过现场不同降压工况的抽水试验,获得了不同土层的水文地质参数.在此基础上,运用三维非稳定流有限差分法分析了降压方案的可行性,为今后类似工程的设计和施工提供了借鉴.