基于工程可靠度、工程造价、工期的深基坑支护结构选型研究

针对目前深基坑支护结构选型缺乏科学依据 ,仅凭工程经验判定支护方法等存在的问题 ,通过分析深基坑支护工程的主要参数 ,如基坑深度、岩土性质、地下水位以及周围环境等 ,分别研究工程可靠度、工程造价、工期对支护结构选型的影响 .同时运用非结构性决策模糊集分析法 ,计算了深基坑支护结构在考虑工程可靠度、工程造价、工期时对优的相对隶属度 .由于相同的深基坑支护工程 ,不同的支护结构型式对优的相对隶属度不同 ,据此可进行深基坑支护结构选型的判定 .通过工程实例论证 ,该理论方法新颖 ,工程应用可靠 ,且适用于公路、桥梁、水利等工程的方案优化研究 .图 1,表 1,参 5 .

Study on selection of braced structures of deep-excavation pit considering construction reliability, cost and time limited

The problems which the present selection of braced structures lack scientific evidence, only depend on engineering experiences are analysised firstly, then the influence of construction reliability, cost and time limited on the selection of braced structures are studied by analyzing the main parameters of deep excavation pit,such as the depth of excavation pit,the properties of soil, the situation of under warter and environment.The optimization of relative membership degree for braced structures of deep-excavation are also calculated,with the construction reliability, cost and time limited considered, by using a non-structural decision making with fuzzy set analysis in this paper. To the same braced structure of deep-excavation pits, the optimization of relative membership degree for unlikely braced structure pattern are differences, therefore it is very easy to select the pattern of braced structures. The method has been proved novel and reliable by practical case and can be applied to the project optimization study of highway,bridge and water conservancy engineering.1fig.,1tab.,5refs.