摘要
在深基坑工程中进行地下水回灌是减弱基坑降水对周边环境的影响有效途径之一。以宁波市轨道交通3号线仇毕站深基坑承压水降水回灌为依托,通过开展降水设计、单井抽灌试验、群井抽灌试验、地表沉降监测以及建筑物沉降监测,获得了(8)_3层砾砂的水文地质和回灌设计参数,评价了抽灌作用下的地表变形特性及控制效果,结果表明:回灌井的回灌效率约为28%;回灌井运行后,地面沉降速率有减小趋势;回灌区房屋累计沉降是非回灌区域的50%～66. 7%。在保障基坑安全开挖的前提下,对基坑周边浅基础建筑群附近布设回灌井,是一种控制地面沉降、保护基坑周边环境的措施。
Groundwater recharge in deep excavation project is one of the effective ways to reduce the impact of foundation pit dewatering on the surrounding environment. Based on the reeirculation of confined water in deep foundation pit at Qiubi Station in Ningbo Metro Line 3, this paper conducts a series of experiments such as precipitation design, single-well pumping/recharging experiment, multi-well pumping test, surface subsidence monitoring and building settlement monitoring. The hydrogeology and design parameters of ⑧3 gravel sand for recharging irrigation are obtained, and surface deformation characteristics and control effects under pumping irrigation are evaluated. The results show that the recharge efficiency of recharging wells is about 28%. After filling well operation, the rate of land subsidence has a tendency to decrease. The accumulative total land subsidence in recharge area is 50% - 66.7% of the non-recharge area. Under the precondition of ensuring the safe excavation of foundation pit, it is a measure for controlling the land subsidence and protecting the surrounding environment of the foundation pit by arranging the injection well near the shallow foundation buildings around the foundation pit.
作者
吴绍升
Wu Shaosheng(China Railway 14^th Bureau Group 4^th Engineering Co.Ltd.,Jinan Shandong 250002,China)
出处
《铁道建筑技术》
2018年第7期89-93,共5页
Railway Construction Technology
基金
山东省技术创新项目(201621901112)
关键词
深基坑降水
抽灌一体化
监测
变形控制
deep foundation pit dewatering
pumping and irrigating integration
monitoring
deformation control
