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分析2012年颁布实施的与1999年实施的《建筑基坑支护技术规程》中不同土压力计算方法对基坑支护设计的影响.选用某工程实例,对不同土压力分布下,支护桩的弯矩、剪力、位移及整体抗倾覆安全系数进行计算和分析比较.然后采用Monte Carlo可靠度方法分析两种不同土压力分布作用下,支护结构的抗倾覆稳定性.利用Matlab语言编写计算程序,分析土压力计算方法的改变对基坑支护可靠度的影响.计算结果表明:土压力按三角形分布计算出的抗倾覆稳定系数减小较大,但两种方法计算的可靠度相差很小,说明采用新规范的计算方法在保证了基本稳定性的同时,对工程安全性提出了更高的要求.
The influence of different earth pressure calculation methods on the design of foundation pit supporting design promulgated in 2012 and the “Technical Code of Supporting Pit for Construction” which was implemented in 1999 is selected.Using a project example, under the different earth pressure distribution, The moment, shear force, displacement and the overall anti-overturning safety factor are calculated and analyzed.At the same time, Monte Carlo reliability method is used to analyze the stability of anti-overturning of the supporting structure under the influence of two different earth pressure distributions. The calculation program is used to analyze the influence of the change of earth pressure calculation method on the foundation pit supporting reliability.The calculation results show that the stability coefficient of anti-overturning calculated by the earth pressure distribution decreases greatly, but the difference between the two methods is different Is small, indicating that the calculation method adopting the new standard has ensured the basic stability and put forward higher requirements on the engineering safety.