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复合地层盾构隧道管片施工病害特征及成因分析

苏昂, 王士民, 何川, 卢岱岳, 方若全

苏昂, 王士民, 何川, 卢岱岳, 方若全. 复合地层盾构隧道管片施工病害特征及成因分析[J]. 岩土工程学报, 2019, 41(4): 683-692. DOI: 10.11779/CJGE201904011
引用本文: 苏昂, 王士民, 何川, 卢岱岳, 方若全. 复合地层盾构隧道管片施工病害特征及成因分析[J]. 岩土工程学报, 2019, 41(4): 683-692. DOI: 10.11779/CJGE201904011
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SU Ang, WANG Shi-min, HE Chuan, LU Dai-yue, FANG Ruo-quan. Disease characteristics and causes analysis of segments of shield tunnels in composite stratum during construction[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(4): 683-692. DOI: 10.11779/CJGE201904011
Citation: SU Ang, WANG Shi-min, HE Chuan, LU Dai-yue, FANG Ruo-quan. Disease characteristics and causes analysis of segments of shield tunnels in composite stratum during construction[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(4): 683-692. DOI: 10.11779/CJGE201904011
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复合地层盾构隧道管片施工病害特征及成因分析  English Version

  • 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

基金项目: 国家自然科学基金项目（51578461）
详细信息
    作者简介:

    苏 昂(1992- ),男,硕士研究生,主要从事盾构隧道结构理论研究工作。E-mail: suang@163.com。

    通讯作者:

    王士民，E-mail：wangshimin@swjtu.edu.cn

  • 中图分类号: TU435;U45

Disease characteristics and causes analysis of segments of shield tunnels in composite stratum during construction

  • Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China

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    摘要
  • 摘要: 上软下硬复合地层盾构隧道施工,极易发生管片裂损病害,对盾构隧道长期安全影响显著。以某地铁盾构隧道为依托,针对施工阶段管片裂损情况进行了大量现场调查,总结归纳了管片裂损分布规律及裂损特征。在此基础上,采用理论分析和扩展有限单元法,系统分析了管片裂损的成因机制。研究结果表明：盾构隧道管片衬砌裂损按照所占比例由大到小依次为环向区域性剥落、纵向裂纹、边角部裂损,环向区域性剥落和纵向裂纹属于结构性裂损,边角部裂损属于材料性裂损。纵向裂纹与千斤顶推力和接触面不平整有关,其产生及扩展多沿千斤顶推力分界面分布,裂纹扩展是能量积累-释放的往复过程,表现出台阶式渐进递增的特点,开裂机制为受拉破坏。环向区域性剥落与环间错台有关,与榫槽径向允许位移量8 mm相等的错台高差是管片发生环向区域性剥落的临界值。在上软下硬复合地层采用错缝拼装进行盾构隧道施工时,应避免使用带榫管片或减小管片榫槽深度。
    Abstract: The construction of shield tunnels in upper-soft and lower-hard composite strata is easy to cause cracking diseases of segments, and has a serious impact on their long-term safety. Based on a metro shield tunnel, a large number of field investigations are carried out for the segment cracks during the construction stage. The distribution laws and characteristics of cracking damage of linings are summarized. On this basis, causes for cracking of segments are analyzed by means of the extended finite element method. The results show that the scale of proportion of cracking forms in the shield tunnels from large to small is the spallings in the circumferential region, longitudinal cracks, and cracks at corners and edges. The first two can be described as the structural failure while the last one can be indicated as the material failure. The generation and expansion of longitudinal cracks, which are related to the jack thrust and the unevenness of contact surface, mostly distribute along the thrust interface of jacks. The propagation of cracks is a reciprocating process of energy accumulation and release with a step shape growth. The mechanism of fracture is tensile failure. The spallings in the circumferential region are related to slab staggering between the rings. The critical value of slab staggering for the spallings in the circumferential region is 8 mm, which is the same as the allowable radial displacement of mortise and tenon. During the construction period of shield tunnels with staggered joint assembly in upper-soft and lower-hard composite strata, the segments with tenon should be avoided and the depth of the grooves should be reduced.
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  • 收稿日期:  2017-11-09
  • 发布日期:  2019-04-24

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