纵向螺栓预紧力对盾构隧道纵向刚度影响分析  

Analysis of influence of longitudinal bolt preload on longitudinal stiffness of shield tunnel

作　　者：黄大维[1] 姜浩[1] 封坤[2] 彩国庆 HUANG Dawei;JIANG Hao;FENG Kun;Cai Guoqing(State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China;Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031,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]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

出　　处：《华中科技大学学报（自然科学版）》2024年第9期110-117,共8页Journal of Huazhong University of Science and Technology(Natural Science Edition)

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：为研究纵向螺栓预紧力对盾构隧道纵向刚度的影响,通过理论计算与模型试验,提出了考虑纵向螺栓预紧力的盾构隧道纵向刚度解析算法,分析了纵向螺栓预紧对纵向刚度的影响.结果表明:纵向螺栓预紧力将影响盾构隧道环缝发生张开的初始弯矩;当环缝处弯矩大于环缝发生张开的初始弯矩时,环缝张开增量与其弯矩增量成正比,而与纵向螺栓预紧力无关;当加载较小时,纵向螺栓预紧力对盾构隧道纵向刚度有显著提升;随着加载的逐渐增大,纵向螺栓预紧力对盾构隧道纵向刚度的提升效果逐渐减小;在分析纵向螺栓预紧力对盾构隧道纵向刚度的影响时建议不考虑纵向螺栓预紧力对地铁盾构隧道纵向刚度的影响.To study the influence of longitudinal bolt preload on longitudinal stiffness of shield tunnel,a method for calculating longitudinal stiffness considering longitudinal bolt preload was proposed in this paper by combining theoretical calculation and model test,and the influence of bolt preload was analyzed.The results show that,the longitudinal bolt preload affects the initial bending moment at the segment ring of shield tunnel;when the bending moment is larger than the initial bending moment,the increment of the opening of the segment ring is proportional to the increment of the bending moment;when the loading is small,the longitudinal bolt preload has a significant improvement on longitudinal stiffness,with the increase of loading,the effect of longitudinal bolt preload on the longitudinal stiffness of shield tunnel decreases gradually,when analyzing the influence of longitudinal bolt preload on the longitudinal stiffness of shield tunnel,it is suggested that the influence of longitudinal bolt preload on the longitudinal stiffness of shield tunnel should not be considered.

关 键 词：盾构隧道 纵向刚度 纵向螺栓预紧力 理论计算 模型试验 

分 类 号：U45[建筑科学—桥梁与隧道工程]