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输水隧洞灌浆式预应力衬砌结构承载机理研究

朱悦悦 刘成

朱悦悦,刘成. 输水隧洞灌浆式预应力衬砌结构承载机理研究[J]. 水利水运工程学报. doi:  10.12170/20220319001
引用本文: 朱悦悦,刘成. 输水隧洞灌浆式预应力衬砌结构承载机理研究[J]. 水利水运工程学报. doi:  10.12170/20220319001
(ZHU Yueyue, LIU Cheng. Study on bearing mechanism of grouting prestressed lining structure of water conveyance tunnel[J]. Hydro-Science and Engineering(in Chinese)) doi:  10.12170/20220319001
Citation: (ZHU Yueyue, LIU Cheng. Study on bearing mechanism of grouting prestressed lining structure of water conveyance tunnel[J]. Hydro-Science and Engineering(in Chinese)) doi:  10.12170/20220319001

输水隧洞灌浆式预应力衬砌结构承载机理研究

doi: 10.12170/20220319001
基金项目: 国家自然科学基金资助项目(51508278)
详细信息
    作者简介:

    朱悦悦(1998—),男,安徽怀宁人,硕士研究生,主要从事隧道结构与有限元模拟研究。E-mail:zyy465696@163.com

    通讯作者:

    刘 成(E-mail:lcheng83@163.com

  • 中图分类号: TV672

Study on bearing mechanism of grouting prestressed lining structure of water conveyance tunnel

  • 摘要: 输水隧洞双层混凝土衬砌之间采用预应力灌浆可以提高结构的承载能力,但此类灌浆式预应力衬砌结构的承载机理尚未得到系统阐释。基于弹性理论,采用荷载结构法,建立了考虑变形协调关系的灌浆式预应力衬砌力学分析模型。通过对衬砌结构进行受力分析,揭示了预应力灌浆提高衬砌结构承载力的机理,推演了衬砌结构环向拉应力判定式,以及环向抗拉强度与灌浆预应力的关系式。利用有限元数值模拟验证了理论方法的合理性,针对工程案例分析了灌浆预应力对衬砌结构的定量影响规律。结果表明:结构能承担的最大内水压力与灌浆预应力及外部水土压力,均近似呈线性正相关,内衬结构的径向变形和环向应力随灌浆预应力增大而减小,外衬结构的径向变形和环向应力随灌浆预应力增大而显著增大。这种考虑临界情况的分析和计算方法,揭示了灌浆式预应力衬砌结构的承载机理,可为该类型输水隧洞的力学分析和结构设计提供理论依据。
  • 图  1  灌浆式预应力衬砌受力分析模型

    Figure  1.  Stress analysis model of grouting prestressed lining

    图  2  衬砌受力分析模型

    Figure  2.  Lining stress analysis model

    图  3  临界情况关系

    Figure  3.  Critical situation diagram

    图  4  预应力灌浆承载机理

    Figure  4.  Prestressed grouting bearing mechanism

    图  5  极限情况关系

    Figure  5.  Limit relation diagram

    图  6  有限元计算模型

    Figure  6.  Finite element calculation model

    图  7  内衬内半径处环向应力(单位:kPa)

    Figure  7.  Circumferential stress at inner radius of inner lining (unit:kPa)

    图  8  外衬内半径处环向应力(单位:kPa)

    Figure  8.  Circumferential stress at inner radius of outer lining (unit: kPa)

    图  9  有无预应力灌浆对结构承载力的影响

    Figure  9.  Influence of prestressed and non-prestressed grouting on structural bearing capacity

    图  10  灌浆预应力大小对结构应力和变形的影响

    Figure  10.  Influence of grouting prestress on structural stress and deformation

    表  1  模型计算参数

    Table  1.   Model calculation parameters

    材料E/MPaμr/mR/m
    外衬(C50) 3.45×103 0.17 2.700 0 3.000 0
    灌浆层(凝固后) 20.00 0.30 2.698 5 2.700 0
    内衬(C35) 3.15×104 0.17 2.300 0 2.698 5
    下载: 导出CSV

    表  2  衬砌环向应力的数值分析与解析计算结果

    Table  2.   Numerical analysis and analytical calculation results of circumferential stress of lining 单位:MPa

    分析位置无预应力有预应力
    数值解析数值解析
    內衬内半径 1.35 1.34 0.982 0.971
    外衬内半径 2.52×10-2 3.45×10-2 0.503 0.511
    下载: 导出CSV
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