基于集对分析方法的深基坑支护方案优选研究

针对影响深基坑方案优选的因素非常复杂,且各因素相互关联,为了得到优化的最佳方案,本文采用集对分析法(SAP)进行深基坑支护方案优选研究。分析了当前集对分析法进行基坑支护方案优选的缺陷,并提出改进的集对分析法用于基坑支护多方案综合评价的多目标决策的方法和步骤;为更合理地诠释各指标因素的影响,采用层次分析法和熵值法相结合的组合赋权法计算各指标的权重;最后结合实例,对集对分析改进前、改进后和模糊灰关联投影法三种方法进行了比较,结果显示改进后的集对分析方法更符合工程实际的综合评价结果,且概念清晰,方法合理,具有一定的推广和实用价值。

Research on Supporting Scheme Optimization for Deep Foundation Pit Based on Set Pair Analysis

For obtaining the optimized supporting scheme, in this paper, the Set Pair Analysis Method (SPA) is used to conduct a research on the optimal selection of supporting schemes for deep foundation pit which has been affected by a variety of complex and interactive factors during the process of selection. The research analyzes the imperfection of the supporting scheme for deep foundation pit via the method of set pair analysis, proposes an improved set pair analysis method and procedures which are utilized in the multi-objective decision for a comprehensive evaluation of supporting scheme for deep foundation pit. Moreover, it indicates that the impact of the weight of various factors is interpreted more reasonably via the combination weighting method associated by AHP and the entropy method. Finally, by comparing the three methods of grey relation projection, set pair analysis and improved set pair analysis, the result shows that the improved model, which is more reasonable and reliable for the practical engineering, is able to be completely utilized in the optimal selection of supporting schemes for deep foundation pit. Therefore, this method has certain practicability and generalizing value in using.