复合地基承载力的模糊可靠度分析

Ambiguous Reliability Analysis of Composite Foundation Load-bearing Capacity

复合地基的稳定在一定程度上可视为一模糊事件 ,由于影响复合地基承载力的因素常常表现出不同程度的随机变异性 ,复合地基承载力也具有随机变异性。建立了复合地基的极限状态方程 ,进而利用概率理论与模糊数学建立复合地基失稳的模糊概率公式 ,并对参数 c、、γ之间的关系做了分析。得出地基承载力的模糊概率分析中 ,主要的影响因素来自于 c、的变异 ,而 γ的变异系数影响很小 ,可以忽略不计 ,计算中可以按常量来计算。

Since all kinds of factors, which affect on bearing capacity of composite foundation, always appear variability in random, then does the bearing capacity of composite foundation, composite foundation stability can be regarded as an ambiguous event at a degree. In this paper, the limit equation of composite foundation stability is established, the formula of ambiguous probability of composite foundation losing its stability have been established by means of probability theory and ambiguous mathematics. The relationship of parameter c,φ,γ have been analyzed. The conclusion is below: the major parameter influenced is parameter c,φ .