考虑多层施工缝界面效应的富水高铁隧道底鼓变形机制  

Floor heave deformation mechanism of water-rich high-speed railway tunnel considering multi-layered construction joint interface effect

作　　者：陈鑫磊 余楚海 张学民[1,2] 武朝光 张永兴[4] CHEN Xinlei;YU Chuhai;ZHANG Xuemin;WU Chaoguang;ZHANG Yongxing(School of Civil Engineering,Central South University,Changsha 410075,China;MOE Key Laboratory of Heavy-Haul Railway Engineering Structures,Central South University,Changsha 410075,China;Nanjing Yanziji Area Rectification and Development Company Limited,Nanjing 210028,China;School of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中南大学重载铁路工程结构教育部重点实验室,湖南长沙410075 [3]南京市燕子矶片区整治开发有限责任公司,江苏南京210028 [4]南京林业大学土木工程学院,江苏南京210037

出　　处：《铁道科学与工程学报》2025年第1期443-455,共13页Journal of Railway Science and Engineering

基　　金：国家自然科学基金高铁联合基金资助项目(U1934211);南京滨诚整治开发计划项目(PPP202202)。

摘　　要：当前,针对富水高铁隧道底鼓病害的研究尚未考虑隧底分层浇筑施工缝界面效应的影响。为补充相关研究空白,结合既有隧道底鼓病害案例,通过引入内聚力模型模拟隧底分层施工结构缝界面力学效应,建立富水高铁隧道底鼓精细化数值计算模型,分析外水压力作用下高铁隧道底部结构施工缝界面损伤状态、变形模式及应力场分布,揭示高水压作用下高铁隧道轨隆病害及层间离缝形成机制,并对不同仰拱施工方式与不同施工缝界面处理措施开展参数分析。研究结果表明:相较于传统不建立隧底施工缝界面接触单元的计算模型,考虑隧底施工缝界面效应时计算所得底鼓变形明显增大,增幅约31%;外水压抬升隧底结构会造成施工缝界面开裂,界面离缝主要分布于整个仰拱-填充界面,和靠近拱脚侧填充-找平层界面;靠近边墙侧道床板-找平层界面同样会产生损伤,其损伤范围较小,但受列车荷载循环作用该初始损伤存在进一步扩展的风险;仰拱-填充界面是削弱隧道抗底鼓变形能力的主要因素,通过界面凿毛以及涂刷界面剂增强施工缝黏结强度可有效提高隧底结构的抗底鼓变形能力;针对富水深埋高铁隧道,建议施工阶段应当重视仰拱与填充分层浇筑界面的强化处理,而在病害整治过程中应关注相关位置的离缝检测与控制。Current research on the water-rich high-speed railway tunnel’s floor heave disease has not considered the interface effect of construction joints'due to layered concrete pouring.To adress this research gap,a refined three-dimensional numerical model was conducted based on an existing high-speed railway tunnel hydraulic disease case to study the mechanism of tunnel floor heave disease.The cohesive zone model was introduced to simulate the interface mechanical effect of construction joints.By analyzing the distribution of the stress field,the deformation pattern,and the development process of construction joint interface damage,the formation mechanisms of tunnel floor heave,and the delamination of tunnel bottom structure joints were revealed.Then,a parametric analysis of the invert arch construction type and various methods of interface measurement was carried out.The research findings indicate that,compared with the conventional model without considering the interface effect of tunnel floor construction joints,the floor heave value due to external water pressure increases significantly by about 31%when the interfacial effect of construction joints is considered.Hydraulic uplift will cause damage to the construction joints,with interface cracking distributed mainly throughout the invert arch-arch fill interface and near the foot side of the arch fill-leveling layer interface.Damage also occurs at the arch foot side of the track slab-leveling layer interface.Although the extent of the track slab-leveling layer interface damage is small,there is a risk of further extension of this initial damage under the cyclic load of the train.The invert arch-arch fill interface is the main factor affecting the floor heave deformation,and the bonding strength of the construction joints can be enhanced by chiseling the interface and applying an adhesion agent,which can effectively improve the resistance to hydrostatic deformation of the tunnel floor structure.For the water-rich and deep-buried high-speed railway tunnels,it is sug

关 键 词：高铁隧道 高水压 底鼓变形 界面开裂 内聚力模型 

分 类 号：U25[交通运输工程—道路与铁道工程]