基于模糊综合评价法的地铁车站深基坑风险评价

Risk assessment of deep foundation pit of subway station based on fuzzy comprehensive evaluation

地铁深基坑工程施工环境复杂,存在大量不确定因素,在深基坑工程中运用模糊综合评价法有利于其风险管理。以宁波轨道交通5号线某车站深基坑为例,建立基坑施工安全性评估指标体系,确定因素集与评语集,依据专家打分对各级因素赋权,选择合适的隶属度函数,建立模糊综合评判模型。通过现场监测数据的模糊综合评价,确定该基坑处于安全状态。该评估流程与方法为地铁深基坑的安全施工评价提供了理论依据,有助于基坑施工安全管理的风险控制措施编制。

The construction environment of deep foundation pit engineering is complex and there are a lot of uncertain factors.The application of fuzzy comprehensive evaluation method in deep foundation pit engineering is help for its risk management.Taking the deep foundation pit of a station of Ningbo Rail Transit Line 5 as an example,this paper establishes the construction safety evaluation index system of foundation pit,determines the factor set and comment set,weights the factors at all levels according to the expert score,selects the appropriate membership function,and establishes the fuzzy comprehensive evaluation model.Through the fuzzy comprehensive evaluation of on-site monitoring data,it is determined that the foundation pit is in a safe state.The evaluation process and method provide a theoretical basis for the safety construction evaluation of subway deep foundation pit,and contribute to the preparation of risk control measures for the safety management of foundation pit construction.