基于模糊贝叶斯证据理论的盾构下穿既有隧道安全风险评价  

Preassessment of Safety Risk of Shield Tunneling underneath Existing Tunnel Based on Fuzzy Bayesian Networks and Evidence Theory

作　　者：吴贤国[1] 刘茜[1] 陈虹宇[2] 曾铁梅 王金峰 陶文涛 WU Xianguo;LIU Xi;CHEN Hongyu;ZENG Tiemei;WANG Jinfeng;TAO Wentao(School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China;School of Civil Engineering and Environment,Nanyang Technological University,Singapore City 639798,Singapore;Wuhan Metro Group Co.,Ltd.,Wuhan 430040,Hubei,China)

机构地区：[1]华中科技大学土木与水利工程学院,湖北武汉430074 [2]新加坡南洋理工大学土木工程与环境学院,新加坡639798 [3]武汉地铁集团有限公司,湖北武汉430040

出　　处：《隧道建设（中英文）》2021年第5期713-720,共8页Tunnel Construction

摘　　要：为了对盾构下穿既有隧道实现更加准确有效的安全风险评价,提出一套基于模糊贝叶斯和证据理论的安全风险评价方法。在总结大量文献和相关标准的基础上,选取14个主要影响因素建立一套较为完善的盾构下穿既有隧道安全风险评估体系及评价标准,引入可对不确定信息进行有效融合的证据理论,结合模糊贝叶斯网络构建盾构下穿既有隧道安全评价模型,并以武汉某地铁工程为例开展实证分析。得出:1)基于构建的安全评价模型进行风险推理和敏感性分析,确定工程的安全风险状态为一般,但有向较危险发展的趋势;2)关键控制因素为新建隧道直径、两隧道的平面夹角、内摩擦角、施工环境的复杂性和施工协调的复杂性。To achieve accurate and effective safety risk assessment for shield tunneling underneath existing tunnel,a set of safety risk assessment methods based on the fuzzy Bayesian network and evidence theory is proposed.First,by summarizing a large amount of literature and relevant standards,a set of relatively perfect safety risk assessment systems and evaluation standards for shield tunneling underneath existing tunnel is established by selecting 14 main influencing factors.Second,the evidence theory that can effectively fuse uncertain information is introduced,and the safety evaluation model of shield undercrossing existing tunnel is established by combining it with fuzzy Bayesian network.Third,a metro project in Wuhan is taken as an example to conduct an empirical analysis.Conclusions are drawn as follows:(1)based on the risk reasoning and sensitivity analysis of the constructed model,the safety risk state of the project is determined to be general and tends to be more dangerous;and(2)the key control factors are the clear spacing of the tunnel,diameter of the new tunnel,plane angle of the two tunnels,internal friction angle,complexity of the construction environment,and complexity of the construction coordination.

关 键 词：盾构隧道 下穿施工 风险评价 贝叶斯网络 证据理论 

分 类 号：U45[建筑科学—桥梁与隧道工程]