多层地基深基坑的渗流稳定问题探讨

 对深基坑设计中的渗流分析与防渗体设计问题进行探讨，指出深基坑渗流计算的重要性，给出现有基坑支护规范的局限性、设计上可能存在的问题、施工上的不足以及相应的对策。对基坑支护提出了抗渗透要求及基坑渗流控制措施。采用3种计算方法，分析了基坑的渗流特性。提出应由基坑抗渗要求确定地下连续墙的最小入土(岩)深度。研究结果表明，所提出的措施较为合理，可为相应的基坑工程提供良好的借鉴。

DISCUSSION ON SEVERAL ISSUES OF SEEPAGE STABILITY OF DEEP FOUNDATION PIT IN MULTILAYERED FORMATION

The issues of seepage analysis and design aspect of anti-seepage body in the design of deep foundation pit are concerned. It is shown that the importance of the seepage calculation of deep foundation pit should be focused on. The limits of current support standards for design and construction of deep foundation pit are pointed out. The basic requirements for foundation pit are provided and related countermeasures are also proposed. With three-dimensional finite difference method，the basic seepage characteristics of deep foundation pit are given；and the minimum embedded depth into soil(rock) of the underground continuous diaphragm wall is determined. The achieved results show that the proposed measures are feasible and they can provide references to similar engineering cases of deep foundation pits.