CFG桩复合地基承载力模糊能度可靠性分析方法.doc
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1、CFG桩复合地基承载力模糊能度可靠性分析方法Fuzzy Possibilistic Reliability Analysis Method for Stability of Bearing Capacity of the CFGpiles Composite Foundation CAO Wengui, TAN Jiling, ZHANG Yongjie (Institute of Geotechnical Engineering, Hunan Univ, Changsha, Hunan 410082,China) Abstract: Based on the analysis of bear
2、ing capacity calculation method of the CFGpiles composite foundation, according to the interval and fuzzy characteristics of its influence factors, triangular fuzzy numbers were used to express the calculating parameters, and then the fuzzy analysis model of bearing capacity calculation of CFGpiles
3、composite foundation was presented. Triangular fuzzy parameters of bearing capacity of CFGpiles composite foundation were proposed by discussing the method to determine triangular fuzzy numbers. And then, based on the given safety factors and the bearing capacity design method to get performance fun
4、ctions, the levelsets technique and interval number algorithm were introduced to establish the fuzzy possibilistic reliability analysis method for bearing capacity of CFGpiles composite foundation. The engineering example analysis shows that the proposed method is rational and simple. On the conditi
5、on that design and survey datas are so limited that we can not directly adopt probability of reliability analysis method, this method can still provide a higher precisive analysis and evaluation for the bearing capacity reliability of CFGpiles composite foundation. Key words:foundations; triangular
6、fuzzy number; uncertainty; fuzzy possibilistic reliability CFG桩复合地基是地基处理中一种常用的处理方法,而承载力取值的合理性是其成功应用的关键之一,闫明礼1对CFG桩复合地基承载力确定方法进行了研究,取得了长足的进步.但是,现有分析方法大多未考虑地质条件的随机性、勘察取样点的离散性和复合地基施工条件与水平的差异性等导致的计算参数取值的不确定性,即便考虑了也均采用随机概率方法2,而在勘测资料有限的情况下计算参数概率分布形式是很难确定的,进而影响其计算结果的准确性,因此,有必要在现有研究基础上探讨CFG桩复合地基承载力不确定性分析新方法
7、,即能在有限数据样本下恰当反映承载力计算参数所具有的不确定性.基于区间理论与模糊数学理论的非概率模糊能度可靠性分析方法3-4,为本文提供了一条新的研究思路,这也正是本文研究的核心与出发点. 本文在深入探讨CFG桩复合地基承载力计算方法基础上,考虑计算参数取值不确定性,采用三角模糊数表示CFG桩复合地基计算参数取值,进一步探讨计算参数三角模糊数取值方法,从而建立CFG桩复合地基承载力非概率模糊能度可靠性分析功能函数.通过综合运用区间数学理论和模糊能度可靠性分析方法,建立出CFG桩复合地基承载力非概率模糊能度可靠性分析方法,对地基承载力进行评价,以期完善CFG桩复合地基承载力分析理论与方法. 1
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