盾构隧道下穿高速铁路的安全因素分析及应用

The analysis and application of safety factors of shield-underneath high-speed railway

基于不同风险因素对高速铁路的安全评价影响程度不同,而实际工程项目往往按照工程经验来实施,具有一定的不确定性与不可靠性,因此,需要对安全评价的各个因素关联度进行分析与研究。以灰色关联分析理论为基础,建立2种关联度模型,计算各个风险因素对安全评价项目的关联度的贡献值,确定不同安全评价中的最主要的影响因素。研究结果表明:加固范围对于盾构下穿高速铁路的安全评价起重要的作用。结合分析所得的结果,利用FLAC3D软件计算不同加固范围下的安全评价值,确定最合理的加固范围。通过工程应用,表明灰色关联分析在盾构下穿高铁工程中具有一定的理论应用,为类似的工程提供一定的理论与实践参考。

Although different risk factors have different influences in the safety assessment for High-speed railway.There is some uncertainty and unreliability when the real projects are often implemented by engineeringexperience in the past; therefore, it is necessary to analyze and investigate the correlation degree of each factor ofthe safety evaluation. Based on the Grey Correlation Analysis Theory, the Deng’s Relational Model and RelativeRelation Grade Model were set up to calculate each risk factors’ condition to the Safety Evaluation Project and todetermine the most important factors in different safety assessment projects. The results show that thereinforcement scope is the maximum correlation with the value of the safety assessment. Combined with theresults of calculation and analysis, the model was applied in a certain engineering example, using the software FLAC^3D to set up three-dimensional numerical model, conducting analog computation for shield excavation, andcalculating the safety evaluation value in different reinforcement scopes. Through the application of engineeringpractice, it is indicated that Gray Correlation Analysis has certain theory application in the shield-underneath high-speed railway engineering, which can provide a reference for similar engineering projects.