基于随机场的盾构下穿桥梁行车安全性分析  

Analysis of the Traffic Safety of Shield Underpassing Bridges Based on the Random Field

作　　者：施成华[1] 张轩煜 安斌 SHI Chenghua;ZHANG Xuanyu;AN Bin(Central South University,Changsha,Hunan 410075,China;China Rare Guangxi Rare Earth Co.Ltd,Nanning,Guangxi 530012,China;The 2nd Engineering Co.Ltd of China Railway Tunnel Group,Sanhe,Hebei 065201,China)

机构地区：[1]中南大学,长沙410075 [2]中稀广西稀土有限公司,南宁530012 [3]中铁隧道集团二处有限公司,三河065201

出　　处：《铁道工程学报》2025年第3期48-54,共7页Journal of Railway Engineering Society

基　　金：湖南省自然科学基金资助项目(2021JJ30837);国家自然科学基金资助项目(51778636)。

摘　　要：研究目的:随着城市化进程加快,盾构下穿既有铁路桥的工程日益增多。为分析研判盾构下穿铁路桥行车安全性,采用基于高斯型自相关函数以及Karhunen-Loève(K-L)级数展开法的随机场理论,考虑了地层土体所具有的空间变异性和自相关性,建立精细化的三维有限元模型进行随机性分析,并针对分析结果进一步给出了盾构下穿铁路桥行车安全性的分析方法和应对措施。研究结论:(1)随机场理论能够较好地应用于盾构下穿既有铁路桥梁的钢轨变形分析中,相比于确定性分析,随机性分析方法得到的随机曲线能够更加充分表征钢轨变形的过程、趋势和范围,体现土体参数随机性对钢轨变形的影响;(2)给出了不同控制值下的钢轨变形超标概率以及施工不同阶段下的行车的速度限值,确保施工阶段下的行车安全性;(3)本研究成果能够较好地应用于盾构下穿铁路桥等领域。Research purposes:With the acceleration of urbanization,the number of projects of shield underpassing existing railroad bridges is increasing.To analyze and judge the safety of shield structure under the railroad bridge,the random field theory based on Gaussian autocorrelation function and Karhunen-Loève(K-L)level expansion method is adopted,the spatial variability and autocorrelation of the ground soil are taken into account,and a refined three dimensional finite element model is established for stochastic analysis,and the results of the analysis further give an analytical method and countermeasures for the safety of shield structure under the railroad bridge.The analyzing method and countermeasures are given to the safety of shield structures under railway bridges.Research conclusions:(1)The random field theory can be better applied to the analysis of rail deformation of shield structure underneath the existing railroad bridge;Compared with the deterministic analysis,the stochastic curve obtained by the stochastic analysis method can more fully characterize the process,trend,and deformation range of rail deformation,reflecting the effect of the stochasticity of the soil parameters on the deformation of the rail.(2)This paper gives the probability of rail deformation exceeding the standard under different control values and the speed limit value of traveling under different stages of construction,to ensure the safety of traveling under the construction stage.(3)The research results can be better applied to the shield structure under the railroad bridge and other fields.

关 键 词：盾构下穿 钢轨变形 随机场理论 自相关函数 级数展开法 

分 类 号：TU44[建筑科学—岩土工程]