深基坑支护结构的抗倾覆稳定探讨与可靠度研究

Anti-Overturning Stability Discussion and Reliability Research for the Bracing Structure of Deep Foundation Pit

采用2种规范推荐的方法计算了某深基坑支护结构的抗倾覆安全系数,两种方法计算结果相差甚大.因此,提出用Monte Carlo的可靠度方法分析支护结构的稳定性,并利用Matlab语言编写了相应的计算程序,得到了同一工程的可靠度指标.结果表明:按两种不同计算方法得到的可靠度指标很接近,采用可靠度指标作为深基坑支护结构安全的评价标准更合理,并给出了可靠度的建议指标值.

The anti-overturning safety index of the bracing structure on a deep foundation pit was calculated by using the different methods given by two specifications.While comparing the results,the two indexes are significant different.Then,Monte Carlo reliability method is adopted to analyze the stability of bracing structure.In which Matlab language is used to program and the reliability index is gotten.The results showed that the reliability index is very close though the two different methods are used.So using reliability index was more reasonable than safety index when evaluating the security of deep foundation pit bracing structure and a recommended reliability index values is given.