挤压性地层TBM隧道形变压力计算方法研究  

Research on the Calculation Method for Deformation Pressure of TBM Tunnel in Squeezing Ground

作　　者：李志军[1] 王明年[1] 王志龙[1] 于丽[1] 姜志毅[1] 张霄[1] 上官宇文 LI Zhijun;WANG Mingnian;WANG Zhilong;YU Li;JIANG Zhiyi;ZHANG Xiao;SHANGGUAN Yuwen(Southwest Jiaotoug University,Chengdu,Sichuan 610031,China)

机构地区：[1]西南交通大学,成都610031

出　　处：《铁道工程学报》2024年第7期63-68,共6页Journal of Railway Engineering Society

基　　金：国家重点研发计划(2022YFB2302403/06,JGYJGBM-JSBZS-2023-0110,2022YFB2302402-01)。

摘　　要：研究目的:目前国内外主要围绕挤压性地层条件下双护盾TBM的设备选型与施工技术进行研究,但是针对管片结构设计方面的研究却较少,尤其是针对管片结构所受围岩压力的研究。为了弥补这方面的研究不足,本文结合TBM隧道施工的时空效应,重点研究双护盾TBM隧道管片在挤压性地层中的形变压力计算方法。研究结论:(1)通过采用遗传蠕变模型,模拟了围岩变形的时序效应,并将其整合到隧道纵向变形曲线中,因此形成了一种考虑时空效应的隧道纵向变形曲线计算方法,通过考虑第一阶段的超前变形量,构建了基于等效开挖洞径的围岩特性曲线公式;(2)利用厚壁圆筒的弹性理论,推导出了管片-豆砾石组合支护的刚度计算公式,同时,建立了临界弹性模量的计算表达式;(3)基于收敛-约束法分析原理,推导出了组合支护力与组合支护位移的公式,进一步形成了管片形变压力的计算方法,最终这一形变压力计算方法的准确性通过实际工程案例得以验证;(4)本研究成果可应用于挤压性地层TBM隧道管片结构的设计。Research purposes:At present,research on double shield TBM is mainly focused on equipment selection and construction technology under squeezing geological conditions both domestically and internationally.However,there is relatively little research on the design of pipe segment structures.In order to make up for the lack of research in this area,based on the temporal and spatial effects of TBM tunnel construction,the focus was on the calculation method of deformation pressure of double shield TBM tunnel segments in squeezing ground.Research conclusions:(1)By using a genetic creep model,the temporal effects of surrounding rock deformation were simulated and integrated into the longitudinal deformation curve of the tunnel,thus forming a method for calculating the longitudinal deformation curve of the tunnel that takes into account the temporal and spatial effects.In addition,the advanced deformation in the first stage was also considered and a formula for the characteristic curve of surrounding rock was constructed based on the equivalent excavation diameter.(2)Using the elastic theory of thick walled cylinders,a stiffness calculation formula for pipe segment gravel composite support was derived,and an expression for calculating the critical elastic modulus was established.(3)Based on the principle of convergence constraint analysis,the formulas for the combined support force and displacement were derived,further forming a calculation method for the deformation pressure of pipe segments.Finally,the accuracy of the deformation pressure calculation method was verified through practical engineering cases.(4)The research result can be applied to the design of TBM tunnel segment structure in squeezing ground.

关 键 词：挤压性地层 管片 双护盾TBM 形变压力 隧道 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]