基坑工程长期地下水回灌控沉应注意的几个问题

地下水回灌正被广泛用于基坑工程中以减小由于基坑降水而引起的坑外沉降。然而，如果回灌设计及操作过程不合理，该方法恐将无法成功控制环境变形，反而会带来不利的工程环境效应。文章提供了某基坑工程长期地下水回灌案例，通过对基坑施工及回灌过程中坑外水位及建筑物沉降的长期观测，得到水位及建筑物沉降随时间的演化规律，阐明降水-回灌作用下建筑物沉降发展的机理。在此基础之上，总结基坑工程长期地下水回灌控沉应注意的几个问题，并提出一系列措施以帮助工程人员更好地利用回灌来进行沉降控制。

Problems needed to be noticed for artificial recharge in deep excavation for settlement control

Artificial recharge is increasingly applied in deep excavation to minimize the dewatering-induced surrounding groundwater drawdown and ground settlements. However, if the recharge is not reasonably designed and conducted, the recharge may be not able to successfully restrict the dewatering-induced environment deformation. In this study, a case study of long-term recharge in deep excavation is reported. The development of groundwater level and building settlement outside the excavation are investigated based on long-term monitoring data. The mechanism of building settlement under the couple action of dewatering and recharge is clarified. On this basis, we summarize the problems needed to be noticed for artificial recharge in deep excavation for settlement control, and further propose a series of measures for engineers to help them better use recharge for settlement control.