隧道仰拱参数对衬砌结构受力变形的影响研究  

Study on the influence of tunnel invert parameters on the stress and deformation of lining structure

作　　者：杨治军 王永刚 刘泾堂 胡金鑫 邱成虎 YANG Zhijun;WANG Yonggang;LIU Jingtang;HU Jinxin;QIU Chenghu(Gansu Province Transportation Planning,Survey&Design Institute Co.,Ltd.,Lanzhou 730030,China)

机构地区：[1]甘肃省交通规划勘察设计院股份有限公司,甘肃兰州730030

出　　处：《甘肃科学学报》2025年第1期85-91,共7页Journal of Gansu Sciences

基　　金：甘肃省重点研发计划项目(21YF1GA381);甘肃省交通运输厅科技项目(2021-09)。

摘　　要：为了研究隧道仰拱参数对二次衬砌结构力学、形变特征的影响规律,建立不同围岩条件下的衬砌荷载-结构计算模型,并进行了衬砌结构受力变形分析。结果表明:隧道净空断面为三心圆时,随着仰拱深度增加,衬砌结构内力(弯矩、剪力、轴力)和变形均逐渐减小,且拱脚处衬砌内力减小幅度最为显著。结合不同仰拱深度条件下衬砌弯矩、剪力的拟合结果,发现三心圆断面仰拱深度在225~235 cm之间(仰拱矢跨比为1/5)时,衬砌结构受力最小。在不同围岩条件下,衬砌结构变形量随着仰拱深度增加而减小,且减小幅度也逐渐变小,发现仰拱结构轴力最大值分布位置与围岩作用条件存在一定相关性。研究结果对隧道衬砌结构设计具有指导意义。The mechanics and deformation characteristics of secondary lining structures under different surrounding rock conditions were investigated by establishing a lining load-structure calculation model,analyzing the force and deformation of the structure,and examining the influence of invert parameters.The results indicate that in the case of a tricentric tunnel clearance section,the internal forces(bending moment,shear force,axial force)and deformation of the lining structure gradually decrease as the invert depth increases.The most significant reduction in internal force occurs at the arch foot.By considering the fitting results of bending moment and shear force for different invert depths,it is observed that when the invert depth of the tricentric section ranges between 225 cm and 235 cm(with an invert span ratio of 1/5),there is minimal stress on the lining structure.Under varying surrounding rock conditions,decreasing trends in deformation are observed with increasing invert depth;and the decrease becomes less pronounced over time.Furthermore,a certain correlation is found between the distribution position of maximum axial force on the invert structure and surrounding rock conditions,which provides valuable guidance for tunnel lining design.

关 键 词：隧道仰拱参数 荷载-结构模型 衬砌内力 衬砌变形 

分 类 号：U451[建筑科学—桥梁与隧道工程]