类矩形盾构隧道数值模拟研究及若干施工因素分析

发布时间：2018-05-17 17:56

本文选题：类矩形盾构 + 浅覆土　；参考：《现代隧道技术》2016年S1期

【摘要】：地表变形和管片抗浮是浅埋类矩形盾构隧道施工的重要控制指标。为了探究某些施工因素对地表变形和管片抗浮的影响规律,依托宁波轨道交通3号线项目,通过有限元软件ABAQUS进行的数值模拟,对浆液结石体弹性模量、应力释放率、隧道压重等施工因素进行了分析。结果表明,浅埋类矩形成型隧道地表变形表现为沉降,地表沉降量随着浆液结石体弹性模量增大而变小,随着应力释放率增大而变大;通过压重控制地表沉降效果很小,应采用抗剪强度高、比重大的同步注浆浆液控制管片上浮;合理地调节各施工因素可有效控制地表沉降和管片上浮。研究成果可为类似工程施工因素优化和地表变形控制提供参考。
[Abstract]:Surface deformation and segment anti-floating are important control indexes for shallow-buried rectangular shield tunnel construction. In order to investigate the influence of some construction factors on surface deformation and segment anti-floating, the elastic modulus and stress release rate of slurry stone body were simulated by the finite element software ABAQUS based on Ningbo Rail Transit Line 3 project. The construction factors such as tunnel pressure and weight are analyzed. The results show that the surface deformation of shallow rectangular shaped tunnel shows settlement, the amount of surface settlement becomes smaller with the increase of elastic modulus of slurry stone, and becomes larger with the increase of stress release rate, and the effect of controlling surface settlement by gravity is very small. Synchronous grouting with high shear strength and high specific gravity should be used to control the floatation of segments, and reasonable adjustment of various construction factors can effectively control the surface subsidence and segment floatation. The research results can be used as a reference for the optimization of construction factors and the control of surface deformation in similar projects.
【作者单位】：同济大学地下建筑与工程系;宁波市轨道交通集团有限公司;同济大学岩土及地下工程教育部重点实验室;
【基金】：973资助项目(No.SQ2015CB070563) 上海市科学技术委员会资助项目(No.14DZ1207900) 宁波市重大科技攻关资助项目(No.2015C110017)
【分类号】：U455.43

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