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研究了水泥系深层搅拌桩复合地基承载力概率分析的方法 ,这对复合地基的可靠性设计将起着积极的推进作用。采用面积比的公式来计算搅拌桩复合地基的极限承载力 ,并通过一些实例统计了模型不确定性因子。首先通过分析确定了桩间土极限承载力以及桩体极限承载力的均值和方差 ,并由此得出复合地基极限承载力的概率特性。然后根据复合地基静载试验结果用Bayes更新的方法得到了更为可信的水泥土搅拌桩复合地基承载力的概率特性。最后用一个实例说明了计算过程
The method of analyzing the probability of bearing capacity of cement deep mixing pile composite foundation is studied, which will play a positive role in the reliability design of composite foundation. The formula of area ratio was used to calculate the ultimate bearing capacity of composite foundation. The uncertainties of the model were calculated by some examples. Firstly, the mean and variance of the ultimate bearing capacity of the soil between the piles and the ultimate bearing capacity of the pile are determined by analysis, and the probability characteristics of the ultimate bearing capacity of the composite foundation are obtained. Then according to the static load test results of composite foundation, we obtain the more credible probabilistic characteristics of bearing capacity of composite foundation with cement-soil mixing pile by Bayes update method. Finally, an example illustrates the calculation process