研究结果:在总结地下工程建设对地下水环境影响基础上，以西安市城市轨道交通2号线为例，利用经验 公式计算施工期车站基坑降水对地下水的影响，并采用数值模拟的方法预测地铁运营后对地下水流场的 影响。地铁施工期的基坑降水只发生在张家堡站，中心水位下降6. 3 m，降水量为10 454.15 m3/d，影响半径 441 m，对地下水流将产生一定的影响;地铁建成运营以后的地铁线路阻挡了地下水的径流，造成“迎水面”水 位童高，“背水面”水位降低，通过模拟水位变幅在0～1.7 m。

Research results: Based on the summary on influence of understructure work construction on ground water environmental and taking the Line 2 of Xi ˊan City Rail Communication as an example , the influence of foundation pit precipitation in construction period on the groundwater environment is calculated with empirical formula and the influence on the flow field of groundwater after metro operation is predicated with the numerical simulation the method. However, the foundation pit precipitation only occurred in the Zhang Village station with the central water level dropping 6. 3 m, the precipitation of 10 454. 15 m3/d and influencing radius of 441 m. This will have certain influence on the ground-water flow because the underwater flow mute will be dammed by the metro track, resulting in head water raising and rear water lowering with simulation change amplitude of underground water level between 0～1.7 m.