基于C-OWA算子的地铁深基坑施工安全可拓评价

Extension Evaluation of Subway Deep Foundation Pit Construction Safety Based on C-OWA Operator

近年来,地铁深基坑安全事故不断出现,给社会的安全性和稳定性造成了严重的威胁,为了减少风险的发生,对地铁深基坑的施工风险进行科学准确的评价至关重要。首先,根据深基坑施工的主要内容将深基坑施工安全风险评价指标分为勘察与监测、土方开挖、地基处理、基坑支护、排水降水、施工环境6个一级指标和18个二级指标,并应用考虑专家主观偏好的COWA算子进行指标的合理赋权;其次,选用物元可拓模型对基坑施工过程的整体安全进行评价,最后结合青岛地铁4号线某深基坑工程进行实例分析。结果显示,该深基坑工程的安全等级为中等,与工程实际相符合,表明基于C-OWA算子的地铁深基坑施工安全可拓模型具有一定的科学性和可行性。

In recent years,safety accidents of deep foundation pit of subway have appeared constantly,which have caused serious threats to social security and stability.In order to reduce the occurrence of risks,it is very important to evaluate the construction risks of deep foundation pit of subway scientifically and accurately.Firstly,according to the main contents of deep foundation pit construction,the safety risk evaluation indexes of deep foundation pit construction are divided into 6 first-class indexes and 18 second-class indexes,including investigation and monitoring,earthwork excavation,foundation treatment,foundation pit support,drainage and precipitation,and construction environment,and the C-OWA operator considering the subjective preference of experts is used to give reasonable weights to the indexes.Secondly,the matter-element extension model is selected to evaluate the overall safety of the foundation pit construction process.Finally,an example of a deep foundation pit project of Qingdao Metro Line 4 is analyzed.The results show that the safety level of the deep foundation pit project is medium,which is consistent with the engineering practice.It shows that the safety extension model of subway deep foundation pit construction based on C-OWA operator is scientific and feasible.