桩墙式支护结构抗倾覆稳定性探讨

Overturning Stability Calculation for Piles Wall Supporting Structure

桩墙式支护结构抗倾覆稳定性是基坑工程最重要的设计计算内容之一,往往成为基坑支护结构成败的关键。在计算桩墙式支护结构抗倾覆稳定安全系数时,一些书籍甚至国家规范给出了不同的计算模式和公式,表面看都有合理性,但深入分析存在较大问题。该文结合典型算例,针对开挖深度和支撑的5种不同工况,分别用不同的4种计算模式计算支护结构抗倾覆稳定安全系数,最大相对误差可能超过35%,进一步分析了计算结果的规律和误差的原因,从理论和工程实际的角度对4种计算模式进行了讨论,提出了有工程实际意义的建议。

The overturning stability of piles wall supporting structure is the most important design and calculation in foundation pit engineering,often becomes the key to success or failure.In calculating the overturning stability factor of piles wall supporting structure,different calculation modes and formulas are given in some books even national standard,judging by appearance,they are all rational,but large problems exist if we analysis in-depth.Combined with examples,five different cases which devided according to the excavation depth and supporting,respectively calculates different four kinds calculation modes about their overturning stability factor,the maximum relative error may exceed 35%,and the rule of the calculation result and the reason of the error are analyzed further.The four kinds calculation mode from the angle of theory and actual are discussed,and then the practical significance of the project proposal are put forward.