基于改进群组与模糊软集的深基坑开挖过程安全风险评价

Safety Risk Assessment for Deep Foundation Pit Construction of Metrostation based on Improved Group and Generalized Fuzzy Soft Sets

为确保地铁车站深基坑施工过程安全可靠,提出基于改进群组G2与广义模糊软集相结合的安全风险评估方法.首先,结合工程实际,辨识出开挖过程包含的七个风险点;然后,构建一个包含6个一级指标和25个二级指标的深基坑开挖过程安全风险评价指标体系;第三,在提炼出各风险点的风险因子前提下,基于改进群组G2法对评价指标赋权;最后,采用模糊软集方法对该地铁车站深基坑工程进行综合评价.研究结果表明,基于改进群组与模糊软集的综合评价方法能实现对结构复杂、动态影响因素较多的地铁车站深基坑开挖过程的安全可靠性进行有效评估.

In order to ensure the safe and reliable construction process of deep foundation pit of metro station,a safety risk assessment method based on the improved group G2 and generalized fuzzy soft set is proposed.Combined with the actual construction of a deep foundation pit of a subway station,seven risk sites of the deep foundation pit excavation procession were identified,each safety risk sites were analyzed from each parts of the"man,machine,ring,pipe,natural conditions and accident handling",and a safety risk assessment index system consisting of 6 first-level indicators and 26 second-level indicators is constructed.On the premise of extracting the risk factors of each risk point,the evaluation index is empowered based on the improved group G2 method.Finally,the fuzzy soft set method is used to evaluate the deep foundation pit engineering of the metro station comprehensively.The results show that the comprehensive evaluation method based on improved group and fuzzy soft set can effectively evaluate the safety and reliability of deep foundation pit excavation in metro station with complex structure and many dynamic factors.