地铁深基坑支护方案的模糊综合分析与评价
The fuzzy comprehensive analysis and evaluation of subway deep foundation pit supporting scheme
徐鹏松 1贺可强1
作者信息
- 1. 青岛理工大学 土木工程学院,青岛 266525
- 折叠
摘要
由于地铁深基坑支护方案的选择是一种受多因素共同作用影响的复杂项目,需对支护方案进行探讨分析与评价,研究和确定最优支护方案,以期提高支护施工效益并减少支护不当造成的安全风险.依层次分析法构建结构模型,通过综合考虑安全可行、经济成本、环境影响、施工方案4个方面,分析13个影响因素,并利用信息熵综合优化权重,再与模糊综合评价相结合,对支护方案进行综合评价.结合青岛地铁深基坑工程实例,对提出的3种备选方案进行打分、计算处理,并通过对比各因素之间重要程度及总综合评价值,进而得出适合本工程的最优支护方案.研究结果表明,3种支护方案的总综合评价值W'3=3.1433<W'1=3.1486<W'2=3.3140,可知方案2(围护桩+内支撑支护)为最佳支护方案,并通过模拟验算其满足施工要求,且支护效果较好;该评价方法较为准确可行,操作简单,且适用于各种基坑的支护方案选择,可为地铁深基坑支护方案评选提供参考.
Abstract
As the selection of the support scheme for subway deep foundation pit is a complex project affected by multiple factors,it is necessary to discuss,analyze and evaluate the sup-port scheme,study and determine the optimal support scheme,so as to increase the efficien-cy of support construction and reduce the safety risk caused by improper support.In this study a structure model is constructed according to analytic hierarchy process,and 13 influ-encing factors are analyzed from the four aspects of safety and feasibility,economic cost,en-vironmental impact and construction scheme.The weights of the 13 factors are optimized by information entropy,and then combined with fuzzy comprehensive evaluation,the compre-hensive evaluation of the support scheme is carried out.Taking Qingdao Metro deep founda-tion pit engineering as the example,the three alternative schemes are scored and calculated,and the most suitable supporting scheme for this project is obtained by comparing the impor-tance degree and total comprehensive evaluation value of each factor.The research results show that the total comprehensive evaluation value of the three support schemes is W'3=3.1433<W'1=3.1486<W'2=3.3140.We can see that scheme 2(envelope pile+internal support)is the best support scheme,because through calculation and simulation we find that it meets the construction requirements and the support effect is good.This evaluation meth-od is more accurate and feasible,easy to operate,suitable for the selection of various founda-tion pit support schemes,and can provide a reference for the selection of deep foundation pit support schemes.
关键词
深基坑工程/支护方案评价/模糊综合评价/组合赋权Key words
deep foundation pit engineering/support scheme evaluation/fuzzy comprehen-sive evaluation/combinatorial weighting引用本文复制引用
基金项目
山东省自然科学基金资助项目(ZR2020KE004)
出版年
2024
NETL
NSTL
万方数据