基于螺栓拉伸刚度的地铁盾构隧道纵向刚度计算  

Longitudinal Stiffness Calculation of Metro Shield Tunnel Based on Bolt Tensile Stiffness

作　　者：黄大维[1,2] 姜浩[1,2] 封坤[3] 丁智 彩国庆 金浩 HUANG Dawei;JIANG Hao;FENG Kun;DING Zhi;CAI Guoqing;JIN Hao(State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang Jiangxi 330013,China;Jiangxi Provincial Key Laboratory of Disaster Prevention and Emergency Management,East China Jiaotong University,Nanchang Jiangxi 330013,China;Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu Sichuan 610031,China;Department of Civil Engineering,Hangzhou City University,Hangzhou Zhejiang 310015,China;School of Transportation,Southeast University,Nanjing Jiangsu 211189,China)

机构地区：[1]华东交通大学轨道交通基础设施性能监测与保障国家重点实验室,江西南昌330013 [2]华东交通大学江西省防灾减灾及应急管理重点实验室,江西南昌330013 [3]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [4]浙大城市学院土木工程系,浙江杭州310015 [5]东南大学交通学院,江苏南京211189

出　　处：《中国铁道科学》2024年第4期89-98,共10页China Railway Science

基　　金：国家自然科学基金资助项目(52378398,52078213);江西省主要学科学术和技术带头人领军人才项目(20232BCJ22009)。

摘　　要：针对现有盾构隧道纵向刚度计算方法缺乏试验验证且未考虑螺栓拉伸刚度等因素影响的不足,首先,理论推导盾构隧道纵向刚度的解析计算方法;然后,以上海地铁盾构隧道为背景,设计并开展缩尺模型试验,通过实测结果验证解析计算方法;最后,以珠三角地区盾构隧道为工程背景,计算盾构隧道纵向刚度。结果表明:由于螺栓预紧力的存在,跨中加载较小时的实测隧道纵向刚度偏大,但随着跨中加载的增加,实测结果与理论计算结果趋于接近,验证了解析计算方法的合理性;珠三角地区盾构隧道在弹性阶段、塑性阶段和塑性变形后的纵向螺栓拉伸刚度依次为2.1255×10^(6),0.9859×10^(6)和3.1856×10^(6) N·m^(-1),纵向刚度依次为3.3068×10^(8),1.5345×10^(8)和4.9543×10^(8) N·m^(2);考虑到地铁盾构隧道发生纵向变形时,一定范围内的纵向螺栓所处变形阶段存在差别,在实际纵向刚度取值时应根据隧道最大变形导致的纵向螺栓拉伸量来具体分析确定。In view of the deficiency that the existing calculation method for longitudinal stiffness of shield tunnel was lack of experimental verification and did not consider the influence of factors such as bolt tensile stiffness,the analytical calculation method for longitudinal stiffness of shield tunnel was deduced theoretically at first.Then,taking the shield tunnel of Shanghai Metro as the background,a scale model test was designed and carried out,and the analytical calculation method was verified by the measured results.Finally,the longitudinal stiffness of this type of shield tunnel was calculated based on the project background of the shield tunnel in the Pearl River Delta region.The results show that due to the existence of bolt preload,the longitudinal stiffness of the measured tunnel is larger when the mid-span loading is small,but with the increase of the midspan loading,the measured results tend to be close to the theoretical calculation results,which verifies the rationality of the analytical calculation method.The tensile stiffness of longitudinal bolts of shield tunnels in the Pearl River Delta region in the elastic stage,plastic stage and plastic deformation stage is 2.1255×10^(6),0.9859×10^(6) and 3.1856×10^(6) N·m^(-1),respectively,while the longitudinal stiffness is 3.3068×10^(8),1.5345×10^(8) and 4.9543×10^(8) N·m^(2),respectively.Considering that there are differences in the deformation stages of the longitudinal bolts in a certain range when the longitudinal deformation of the metro shield tunnel occurs,the actual value of longitudinal stiffness should be determined according to the longitudinal bolt tension amount caused by the maximum deformation of the tunnel.

关 键 词：地铁 盾构隧道 纵向刚度 螺栓拉伸刚度 纵向螺栓 模型试验 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]