潮汐波动带深基坑降水数值计算与方案优化

Numerical Calculation and Scheme Optimization of Deep Foundation Pit Dewatering in the Affected Zone of Tide Wave

在旋流池深基坑降水和冷冻法施工均告失败后,根据场地水文地质条件及受潮汐波动影响情况,对造成失败的原因进行了分析,利用原有的降水资料反求水文地质参数,通过数值计算,对深基坑降水布井方案重新进行了调整和优化,采取降水、堵漏和坑内明排相结合的方法,成功地将基坑内地下水位降至基础设计标高以下,达到了工程降水、基坑开挖和基础施工的目的;同时,还对降水引起的地面沉降进行了监测和评价。

After the losing of deep foundation pit dewatering of cyclone pool and freezing construction, according to the hydrogeological conditions of the field and influence of tide fluctuation, the losing reason is analysed in this paper. The hydrogeological parameters are inversely calculated using the former dewatering material. The scheme of well layout of deep foundation pit dewatering is readjusted and optimized properly through numerical calculation. Combining dewatering with leak stopping and open drainage, the groundwater level in the pit is lowered to below the design elevation of foundation which reaches at the aim of engineering dewatering and foundation construction. At the same time, the ground settlement caused by dewatering is monitored and evaluated.