滨海地区某船闸深基坑降水的三维地下水模型

Three-Dimensional Groundwater Model for Deep Foundation Pit Dewatering of a Ship Lock in a Coastal Area

依托实际工程,建立了适用于滨海粉土地基条件下基坑降水的饱和-非饱和三维地下水模型,仿真分析了强涌潮、降雨、井点失效等复杂条件对基坑降水效果的影响。结果表明:在五十年一遇及百年一遇强涌潮作用下口门处基坑的水位变化较大,水位上升迅速,对基坑安全施工存在极大的影响;在降雨工况中持续暴雨对基坑水位影响加大,其水位上升过程较快,而持续大暴雨下,基坑水位上升迅速;在强涌潮和降雨的共同作用时,基坑水位明显提升,且上升迅速。

Based on an actual engineering project,a three-dimensional saturated-unsaturated groundwater model suitable for foundation pit dewatering in coastal silty foundations was established.The model was used to simulate and analyze the impact of complex conditions such as strong tidal surges,rainfall,and well point failures on the effectiveness of foundation pit dewatering.The results show that under the influence of 50-year and 100-year return period strong tidal surges,the water level at the mouth of the pit changes significantly,rising rapidly,which greatly affects the safety of foundation pit construction.During rainfall conditions,continuous heavy rain significantly impacts the water level in the foundation pit,causing it to rise quickly.Under conditions of sustained torrential rain,the foundation pit water level rises rapidly.When strong tidal surges and rainfall act together,the foundation pit water level increases significantly and rapidly.