岩层隧道荷载结构响应影响因素分析  

Analysis of Factors Influencing the Load-structural Response of Tunnel in Rock Environment

作　　者：陶伟明[1,2] 周子扬 刘议文 郭付康 卢春房 吴林[2] TAO Wei-ming;ZHOU Zi-yang;LIU Yi-wen;GUO Fu-kang;LU Chun-fang;WU Lin(Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;China Railway Eryuan Engineering Group Co.Ltd.,Chengdu 610031,China;China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610000 [2]中国中铁二院工程集团有限责任公司,四川成都610031 [3]中国铁道科学研究院股份有限公司,北京100081

出　　处：《中国公路学报》2024年第1期142-153,共12页China Journal of Highway and Transport

基　　金：国家重点研发计划项目(2021YFB2600900);国家自然科学基金项目(52078430)。

摘　　要：为探究岩层隧道各因素对管片荷载结构响应的影响规律,采用理论模型推导了岩层隧道外荷载与结构内力响应及位移响应的解析解。基于岩层隧道管片荷载结构特征,探究了上覆围岩荷载、水头高度、岩层侧压力系数、等效抗弯刚度系数、隧道直径、管片厚度以及混凝土等级等7个主要影响因素对管片荷载结构响应的影响规律;并结合成都市锦绣隧道现场监测试验进行了验证。研究发现:上覆围岩荷载增大与岩层侧压力系数的减小将显著增大管片内力与位移响应;水头增大对管片弯矩与径向位移的影响较小,将大幅增大管片轴力水平;等效抗弯刚度系数的增大不影响管片内力响应,但会使结构径向位移小幅减弱;隧道直径增大将导致管片弯矩、轴力与径向位移小幅增大;管片厚度对结构内力响应影响较小,厚度减小将使管片径向位移小幅增大;混凝土等级变化对隧道荷载结构响应影响细微。对比现场监测结果与模型计算结果,所得荷载结构响应规律相似,表明所提出的分析方法具有较高的准确性。To investigate the impact of different factors on the structural response of segment loads in rock tunnel structures,this study employs a load structure theory model to obtain analytical solutions for the external load,internal force distribution,and displacement response of rock tunnel structures.Taking into account the structural characteristics of rock tunnel segment loads,this study investigates the impact of seven key influencing factors:overlying strata load,water head height,rock lateral pressure coefficient,equivalent bending stiffness coefficient,tunnel diameter,segment thickness,and concrete grade on the structural response of segment loads.The findings are validated through on-site monitoring tests conducted at the Jinxiu Tunnel in Chengdu.The research reveals that reducing overlying strata load and the coefficient of lateral pressure increases internal forces and displacements of tunnel segments.Increasing hydraulic head height has minimal effect on internal forces but significantly raises axial force levels.Increasing the equivalent flexural stiffness coefficient does not affect internal forces but slightly reduces radial displacement.A slight increase in segment bending moment,axial force,and radial displacement is observed with an increase in tunnel diameter.Segment thickness has a minor impact on internal forces,with thicker segments causing a slight increase in radial displacement.Changes in concrete grade have minimal effect on the tunnel's structural response to load.Comparison between field monitoring results and calculated model results exhibits similar patterns in the structural response under load,indicating a highly accurate analysis method proposed in the study.

关 键 词：隧道工程 岩层环境 现场监测 荷载结构响应 因素分析 

分 类 号：U451[建筑科学—桥梁与隧道工程]