The fuzzy comprehensive analysis and evaluation of subway deep foundation pit supporting scheme
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.
deep foundation pit engineeringsupport scheme evaluationfuzzy comprehen-sive evaluationcombinatorial weighting
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