多信息融合的地铁基坑安全状态评价方法

Evaluation Method for Safety Status of Subway Foundation Pit Based on Multi-Information Fusion

依据基坑工程支护结构和周围岩土体的监测项目,将基坑工程自身监测对象分为地表沉降类、围护结构类和内支撑类。根据基坑开挖深度,设定预警监测点的预警关联分析范围,并将此范围作为基坑安全状态评价的对象。在监测预警分级标准的基础上,通过大量案例数据、基坑变形力学关系等,确定地表沉降类、围护结构类和内支撑类的预警标准,并引入熵权理论、区间数和危险度,对预警关联分析范围内的上述3类预警进行融合,创建多因素、多指标综合分析评价基坑安全状态的方法。该方法可实现对多源工程监测数据的融合,客观、快速地评价基坑的安全状态,避免单指标预警和人为判断基坑安全状态时的不全面、不准确等问题,为深基坑安全状态的快速、准确判定提供参考。

According to the monitoring criteria for the supporting structures of foundation pit projects and the surrounding rock and soil mass,the monitoring objectives for these projects are divided into ground settlement type,retaining structure type,and internal support type.Based on monitoring and early warning classification standards,the early warning criteria for these three types are determined using extensive accident case data and the relationships in foundation pit deformation mechanics.Simultaneously,the early warning correlation analysis within the scope of the three types of early warnings is fused,incorporating entropy weight theory and interval numbers,to evaluate the safety state of the foundation pit.This method enables the integration of multi-source engineering monitoring data,providing an objective and rapid assessment of foundation pit safety.It addresses the limitations of single-index early warnings and subjective evaluations of foundation pit safety,offering a valuable reference for the rapid and accurate judgment of deep foundation pit safety conditions.