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目的分析研究轨道交通建设对地下水环境的影响途径,探讨轨道交通建设与城市环境协调发展的思路。方法结合西安市城市快速轨道交通二号线工程区的水文地质条件和工程施工方案,定性分析工程在施工期对地下水环境的影响,利用VisualMODFLOW软件定量分析工程在营运期对地下水流场的影响。结果工程在施工期只有张家堡车站采用轻型井点降水,预测降水量为10 454.15 m3/d;89%的区间隧道采用盾构法和浅埋暗挖法施工,不需工程降水,11%的区间隧道采用高压旋喷注浆桩间止水的控水方式;工程在营运期对地下水的影响无论在抬升区还是下降区,潜水位的变幅基本在0.04~1.75 m之间。结论根据工程在不同阶段对地下水环境的影响程度,采取必要的减缓措施,使轨道交通建设对地下水环境的影响减少到最小。
Objective To analyze and study the impact of rail transit construction on the groundwater environment and to explore ways to coordinate the development of rail transit and urban environment. Methods Based on the hydrogeological conditions and construction plans of Xi’an Metro Rapid Transit Line 2 project area, qualitative analysis of the impact of the project on the groundwater environment during construction period was conducted. VisualMODFLOW software was used to quantitatively analyze the influence of the project on the groundwater flow field during the operation period. Results Only Zhangjiapu Station was constructed with light well point precipitation during the construction period, with a predicted rainfall of 10 454.15 m3 / d. 89% of the tunnels were constructed by shield tunneling method and shallow-buried tunneling without the need of engineering precipitation and 11% Of the interval tunnel adopts high-pressure rotary jet grouting to stop the water between the piles; the impact of the project during the operation period on the groundwater fluctuates between 0.04 and 1.75 m in both the uplift zone and the down zone. Conclusion According to the degree of impact of the project on the groundwater environment at different stages, the necessary mitigation measures are taken to minimize the impact of rail transit construction on the groundwater environment.