深基坑对渗流稳定的影响分析

Analysis on the Influence of Deep Foundation Pit on Seepage Stability

摘要: 过江通道两侧的工作井及接收井多为深基坑，须分析深基坑的存在对邻近堤防渗透稳定的影响。以南京段某一深基坑为例，采用有限元法建立渗流计算模型。根据《堤防工程设计规范》中有关要求，考虑设计洪水位工况下进行渗透稳定计算。计算结果表明：断面逸出点均在背水坡坡脚处，须做好排水设施，逸出点高程在6.8~6.9 m之间，深基坑离水域越近对堤防渗透稳定越不利。

Abstract: The working wells and receiving wells on both sides of the river-crossing channel are mostly deep foundation pits. It is necessary to analyze the influence of the existence of deep foundation pits on the seepage stability of adjacent embankments. Taking a deep foundation pit in the Nanjing branch as an example, a seepage calculation model was established by using the finite element method. According to the requirements of the Design Code of levee project, and considering the design flood level under the condition of seepage stability calculation, the analysis shows that the cross-section escape points are on the back slope foot water and should be well drainaged. The escape point height is between 6.8~6.9 m, and the closer the deep foundation pit is to the water, the more unstable is the levee seepage.