盾构下穿高速铁路路基与隧道的变形传递机理及特征研究  

Deformation Transfer Mechanism and Characteristics of Subgrade and Tunnel of Shield Undercrossing High Speed Railway

作　　者：林家桢 黄智海 彭华[2] 索晓明 肖骁骐[4] 李子晨 LIN Jiazhen;HUANG Zhihai;PENG Hua;SUO Xiaoming;XIAO Xiaoqi;LI Zichen(Urban Transit Business Division,China Railway Design Corporation,Tianjin 300308,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;China Railway Design Corporation,Tianjin 300308,China;Institute of Track Structure Protection Technology,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]中国铁路设计集团有限公司城市轨道交通事业部,天津300308 [2]北京交通大学土木建筑工程学院,北京100044 [3]中国铁路设计集团有限公司,天津300308 [4]北京交通大学轨道结构保护技术研究所,北京100044

出　　处：《中国铁路》2022年第8期162-168,共7页China Railway

基　　金：中国国家铁路集团有限公司科技研究开发计划项目(N2020G009)。

摘　　要：以5个盾构隧道下穿既有高速铁路隧道或路基工程为依托,通过对既有结构沉降数值模拟计算,研究得到了既有高速铁路工程结构在盾构下穿过程中的变形和传递规律;通过已完工的3个工程案例的结构及轨道现场变形监测数据与理论计算结果对比,验证了模型准确性。研究结果表明:(1)隧道刚度越大,相同条件下轨道与结构的差异变形就越小,盾构隧道与路基U形槽的钢轨差异变形较明挖法隧道增大约25%,最大的差异变形均发生在隧道结构与无砟轨道支承层之间,总差异沉降占比约为60%~85%,而采用碎石道床的计算路基沉降与轨道道床沉降基本一致;(2)不同地层条件对隧道-轨道的变形传导规律无明显影响;(3)在相同结构变形条件下,Ⅱ型板式无砟轨道的轨道变形小于Ⅲ型板式无砟轨道,2种无砟轨道变形传递主要发生在底座板与中间层之间。通过对以上工程的分析以及规律的研究,可为类似盾构下穿高速铁路路基与隧道工程的工前预测准备提供借鉴。Based on five projects of shield tunnel undercrossing existing high speed railway tunnels or subgrade,the deformation and transfer law of existing high speed railway engineering structures during shield undercrossing are obtained from the research through numerical simulation calculation of the settlement of existing structures.The accuracy of the model is verified by comparing the field deformation monitoring data of the structure and track of three completed engineering cases with the theoretical calculation results.The results show that:(1)The greater the stiffness of the tunnel,the smaller the differential deformation of the track and the structure under the same conditions.The rail differential deformation of the shield tunnel and subgrade Ugroove is about 25%higher than that of the open-cut tunnel.The maximum differential deformation occurs between the tunnel structure and the supporting layer of the ballastless track,and the total differential settlement accounts for about 60%~85%.In the case of ballast bed,the calculated subgrade settlement is basically the same as the settlement of the track bed.(2)Different stratum conditions have no obvious impact on the deformation transfer law of tunnel-track.(3)Under the same structural deformation condition,the track deformation of Type II slab ballastless track is less than that of Type III slab ballastless track,and the deformation transfer of both ballastless tracks mainly occurs between the base plate and the intermediate layer.Through the analysis of the above projects and the study of the law,this paper can provide a reference for the pre-construction prediction and preparation of similar shield undercrossing high speed railway subgrade and tunnel projects.

关 键 词：盾构下穿 高速铁路 隧道 路基 数值模拟 变形传递 

分 类 号：U213.2[交通运输工程—道路与铁道工程]