隧道初期支护变形侵限分析及补强设计检算  

Analysis of Deformation Intrusion limit of Tunnel Primary Lining and Reinforcement Design Validation

作　　者：柳宝通 LIU Baotong(China Railway Wuyuan Survey and Design Institute Group Co.Ltd.,Beijing 102600)

机构地区：[1]中建铁路投资建设集团有限公司,北京102600

出　　处：《土工基础》2023年第1期36-39,共4页Soil Engineering and Foundation

摘　　要：不良地质条件等原因造成某高铁隧道初期支护发生侵限变形,隧道二次衬砌厚度不能满足原设计的要求,经过对初期支护侵限变形段落的现场量测数据分析,该段初期支护变形已趋于稳定。为减少拆换钢架对隧道初期支护造成的扰动,确保隧道施工和隧道结构安全,采取减薄隧道二次衬砌厚度并对二次衬砌钢筋进行补强的方法进行变更设计,利用Midas-GTS NX软件对隧道二衬结构进行有限元检算分析,得出补强设计的衬砌安全系数满足规范要求,并较侵限段安全系数有增加等结论。按照补强设计施工完成后,隧道侵限段结构安全稳定,未发生变形开裂现象。The intrusion deformation in the tunnel induced by the poor geological conditions and other reasons after the installation of the primary lining was observed and the thickness of the secondary lining did not meet the original design requirements.The evaluation of the construction monitoring data of the intrusion deformation during the primary lining stage indicated that the deformation in the lining system had stabilized.To minimize the disturbance in the primary lining system caused by the removal of the steel supporting system,the design change approach was implemented by reducing the thickness of the secondary lining and strengthening of the steel reinforcement bars in the secondary lining system.The new design approach in the secondary lining system was validated by using MIDAS-GTS NX finite element numerical analysis software.It is concluded that the factor of safety in the strengthening segment met the design requirements.The construction monitoring indicate that the new approach was safe,and no cracking was observed.

关 键 词：隧道 初期支护 侵限变形 二次衬砌 检算 

分 类 号：U456[建筑科学—桥梁与隧道工程]