交通荷载下浅埋暗挖地铁软土隧道稳定性及设计参数研究
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东华理工大学

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U45

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中国博士后科学基金(2022M711429);江西省自然科学(20224BAB204058)


Research on Stability and Design Parameters of Shallow Buried and Undercut Subway Soft Soil Tunnels under Traffic Load
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East China University of Technology

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    摘要:

    为探讨车辆荷载下浅埋软土暗挖通道合理的衬砌断面厚度,采用荷载-结构法和地层-结构法分别建立二维有限元模型,量化了不同埋深、车辆荷载以及衬砌厚度下地铁暗挖通道的受力特性及安全系数。研究结果表明:无论有无车辆荷载,隧道弯矩最大值均位于的拱脚或拱肩处,而轴力最大值均位于拱腰,安全系数最小值则位于拱顶。按原设计配筋,无论是否有车辆荷载,安全系数随埋深增大而减小,随二次衬砌增大而增大。本文浅埋工况下,荷载-结构法计算的安全系数均比地层-结构法计算的安全系数小。荷载-结构法计算结果表明:在车辆荷载与围岩压力下,二次衬砌厚依次为60 cm、90 cm、100cm时,埋深分别不超过8m、12 m、14.6m时满足规范安全系数要求;地层-结构法计算结果表明:在车辆荷载与围岩压力下,二次衬砌厚依次为60cm、80cm、100cm时,其埋深分别不超过12 m、15.5m、19m能满足规范安全系数要求。

    Abstract:

    To explore the reasonable lining section thickness of shallow buried soft soil excavation channels under vehicle loads, two-dimensional finite element models were established using load structure method and strata structure method, respectively. The stress characteristics and safety factors of subway excavation channels under different burial depths, vehicle loads, and lining thicknesses were quantified. The research results indicate that regardless of the presence or absence of vehicle loads, the maximum bending moment of the tunnel is located at the arch foot or arch shoulder, while the maximum axial force is located at the arch waist, and the minimum safety factor is located at the arch crown. According to the original design reinforcement, regardless of whether there is vehicle load, the safety factor decreases with increasing burial depth and increases with increasing secondary lining. Under shallow burial conditions, the safety factors calculated by the load structure method are smaller than those calculated by the stratum structure method. The calculation results of load structure method show that under vehicle load and surrounding rock pressure, the secondary lining thickness is 60 cm, 90 cm, and 100 cm respectively, and the burial depth does not exceed 8 m, 12 m, and 14.6 m respectively, meeting the safety factor requirements of the specifications; The calculation results of the stratum structure method show that under vehicle load and surrounding rock pressure, when the thickness of the secondary lining is 60cm, 80cm, and 100cm respectively, its burial depth does not exceed 12m, 15.5m, and 19m, which can meet the safety factor requirements of the specifications.

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刘聪,罗震,杨帆,等. 交通荷载下浅埋暗挖地铁软土隧道稳定性及设计参数研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-03-12
  • 最后修改日期:2024-05-12
  • 录用日期:2024-05-21
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