不同加固方式下的软硬过渡段隧道基底受列车动载影响规律  

Influence Law of the Tunnel Foundation Subjected to Dynamic Train Load under Different Reinforcement Methods in Soft-hard Transition Section

作　　者：段忠辉 王脉 章慧健 赵岩 霍思逊 郑余朝 DUAN Zhong-hui;WANG Mai;ZHANG Hui-jian;ZHAO Yan;HUO Si-xun;ZHENG Yu-chao(China Railway Design Corporation,Tianjin 300308,China;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031 China;China Railway 12th Bureau Group Co.,Ltd.,Taiyuan 030000,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308 [2]西南交通大学土木工程学院交通隧道工程教育部重点实验室,成都610031 [3]中铁十二局集团有限公司,太原030000

出　　处：《科学技术与工程》2024年第2期773-781,共9页Science Technology and Engineering

基　　金：中国铁路设计集团有限公司科技开发课题(2021A230106);国家自然科学基金(52178395)。

摘　　要：在高速铁路列车动载作用下,隧道穿越软硬岩过渡段时易使隧道结构发生损害,而对于此类工程的动力研究及相关减隔振措施还鲜有涉及。鉴于此,依托广湛铁路相思山隧道工程实例,采用数值计算方法,对比分析无加固以及不同桩板结构加固下隧道穿越软硬岩过渡段时结构的动力响应特性。研究结果表明:在列车荷载作用下,位于交界面软岩侧隧道结构的加速度、动位移和动应力响应与硬岩侧隧道结构的动力响应差异很大,导致隧道交界面附近过渡效果较差,不利于结构的稳定。经三种不同桩板结构加固后,软岩段的隧道结构的动力响应有所减小,且与硬岩段隧道结构的动力响应更接近,过渡效果十分显著。在对比之下,桩板结构1(即承载板+托板+钻孔桩)的减振作用与过渡效果最佳。Under the dynamic load of high-speed railway trains,the tunnel structure is easily damaged when it passes through the transition section of hard-soft rock,while the dynamic research and related vibration reduction measures of such kind of engineering are rarely involved yet.Therefore,based on the engineering case of Xiangsishan Tunnel project of Guangzhou-Zhanjiang Railway,numerical calculation method was adopted to compare and analyze the dynamic response characteristics of the tunnel structure passing through the hard-rock transition section without reinforcement and with different pile-plate reinforcement.The research results show that under the action of train load,the acceleration,dynamic displacement and dynamic stress response of the tunnel structure located around the interface of soft rock are very different from that of the hard rock,resulting in poor transition effect near the tunnel interface,which is not conducive to the stability of the structure.After the reinforcement of three different pile-plate structures,the dynamic response of the tunnel structure in the soft rock side decreases and is closer to the dynamic response of the tunnel structure in the hard rock section,and the transition effect is very significant.In contrast,pile-plate structure 1(namely,bearing plate+supporting plate+bored pile)has the best damping and transition effect.

关 键 词：加固方式 过渡段 隧道 列车动载 减振作用 

分 类 号：U25[交通运输工程—道路与铁道工程]