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基坑降水会改变基坑周围地下水位,进而引起不均匀沉降,影响周围建筑物安全性,实践证明,回灌法是解决此类工程问题的有效手段之一。以济南轨道交通R1线某深基坑降水工程为研究目标,利用Visual Modflow软件分析基坑降水与回灌,分别模拟基坑在止水帷幕与回灌不同工况条件下降水与回灌对周围地下水位与沉降的不同影响效果。仅回灌模拟结果表明:回灌井设在基坑周围10 m处,保持回灌量大于等于抽水量,地下水位控制效果相对较好;回灌结合止水帷幕模拟结果表明:回灌量控制在抽水量的2/3左右,回灌井设在基坑周围30 m处,回灌在整个模型区域地下水位控制效果最好,沉降小于0.1 cm。根据模拟结果得出适用于该工程地下水位扰动最小的回灌方式及最优方案,为工程施工提供理论依据与参考。
Dewatering in foundation pit will change the groundwater level around the foundation pit, which will cause uneven settlement and affect the safety of the surrounding buildings. Practice has proved that recharge method is one of the effective measures to solve such engineering problems. Taking the project of deep foundation pit dewatering in R1 railway of Jinan Rail Transit as the research goal, the Visual Modflow software was used to analyze the foundation pit dewatering and recharge, which simulated the influence of precipitation and recharge on the surroundings of the foundation pit under different conditions of water curtain and recharge Different effects of groundwater level and settlement. The simulation results show that the recharge wells are located at 10 m around the foundation pit and the recharge quantity is greater than or equal to the pumping capacity, and the control effect of groundwater level is relatively good. The simulation results of combined recharge and water stop curtain show that the recharge quantity control About two-thirds of the pumping capacity, recharge wells located 30 m around the foundation pit, recharge in the model area the best control of groundwater level, settlement less than 0.1 cm. Based on the simulation results, it is concluded that the method and the optimal scheme for the minimum disturbance of groundwater table in this project provide the theoretical basis and reference for the project construction.