深基坑支护方案的模糊综合评判

Fuzzy comprehensive evaluation of deep-foundation pit support

为了对深基坑支护方案进行评价,通过建立深基坑支护方案的模糊综合评判法,首先依据深基坑安全等级和变形控制等级初步选择方案,按安全可行、经济合理、环境保护、施工便捷等基本准则进行一级模糊评判。然后根据支护体系设计应满足强度、变形和稳定性验算等基本原则,确定影响安全性的因素,根据支护体系施工费用、土方开挖费、施工监测及检测费、环保费用等基本原则,确定影响经济性的因素,最后根据施工对周围居民生活的影响、施工对周围建筑物和地下管线的影响、施工产生的次生灾害影响等基本原则,确定影响环境保护的因素。最后进行现场工程支护方案模糊评判优选分析。

In order to evaluate schemes of the deep-foundation pit support, with the establishment of fuzzy comprehensive evaluation method of deep-foundation pit ,the initial scheme is selected in accordance with the safety grade and deformation control grade. The first-grade fuzzy evaluation is made according to the basic principles of safety feasibility, economic rationality, environmental protection and construction convenience. Then According to the basic principles of the satisfying strength of the support system design and the checking calculation of deformation and stability the factors affecting safety are determined. According to the construction cost of the support system,cost for earthwork, cost for construction supervision and testing and cost for environmental protection, the factors of affection economy are determined and then the factors affection environmental protection are determined according to the effect of the construction on the residents＇ life, the effect of the construction on the surroundings buildings and underground pipelines, and the secondary disasters caused by the construction. Finally the analysis of the fuzzy comprehensive of the support system is made on the spot.