隧道穿越下埋地管线分布式光纤变形及脱空反演分析  

Inversion analysis of deformation and void formation in buried pipelines induced by tunneling using distributed fiber-optic sensing

作　　者：俞奎 章敏[1,2] 秦文权 孙静雯 张开翔 宋利埼 YU Kui;ZHANG Min;QIN Wen-quan;SUN Jing-wen;ZHANG Kai-xiang;SONG Li-qi(School of Civil Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;Shanxi Key Laboratory of Civil Engineering Disaster Prevention and Control,Taiyuan,Shanxi 030024,China;Guangzhou Electric Power Design Institute Co.,Ltd.,Guangzhou,Guangdong 510610,China)

机构地区：[1]太原理工大学土木工程学院,山西太原030024 [2]土木工程防灾与控制山西省重点实验室,山西太原030024 [3]广州市电力设计院有限公司,广东广州510610

出　　处：《岩土力学》2025年第3期894-904,共11页Rock and Soil Mechanics

基　　金：山西省基础研究计划(No.20210302123168,No.20210302124652);山西省省筹资金资助回国留学人员科研项目(No.2021-061);中央引导地方科技发展资金项目(No.YDZJSX2024B005,No.YDZJSX20231A021)。

摘　　要：针对隧道开挖引起地下管线变形和局部脱空,基于分布式光纤的感知应变,提出了一种非连续管线的变形反演方法。采用双层Winkler地基梁模型模拟管-土相互作用,考虑接头处弯矩-转角关系,基于差分法和共轭梁法,分别推导了应变已知条件下管线位移、转角和土体沉降的反演表达式,对管-土脱空进行了识别。通过与有限元结果的对比,验证了反演理论的合理性和精度。结果表明,接头转动刚度的影响区间基本不受管线弯曲刚度的影响;脱空范围随着管线刚度和土体沉降的增大而增加,当上部土体地基系数较大时,管线主要发生上部脱空,反之,则易发生下部脱空;利用端点和最大应变处双重转角的边界条件,能显著提高反演的抗噪性能。Based on strain measurements from distributed fiber-optic sensors(DFOSs),an inversion method for discontinuous buried pipelines is proposed to predict the deflection and gap formation induced by tunnel excavation.The double-layer Winkler foundation beam model,which takes into account the relationship of bending moment-joint rotation,is employed to investigate the pipeline-soil interaction.The inversed pipeline deflection,rotation,and soil settlement are derived by utilizing the finite difference method and the conjugate beam method,respectively.Furthermore,the extent and location of the interface void are also identified.The inversion accuracy is verified in comparison with the numerical solution of the finite element method.Results show that the influence of joint rotational stiffness on the response lies within a certain range,which is seldom influenced by the pipeline flexural stiffness.The void range increases with the pipeline flexural stiffness and soil settlement.The upper void is likely to occur for an overlying subgrade with a large reaction coefficient,while the lower void is likely for an underlying subgrade.The combined boundary conditions of rotation angles at both endpoints and the position of maximum strain result in high inversion accuracy and markedly improve the anti-noise performance.

关 键 词：分布式光纤 地下管线 隧道 双层Winkler地基 反演 界面脱空 

分 类 号：TU91[建筑科学—建筑理论]