砂土地层盾构隧道开挖面成拱临界深度分析
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TU94.1

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国家自然科学基金(51978019)


Research on Critical Arching Depth and Ultimate Supporting Force of Shield Tunnel Excavation Surface in Sandy Ground
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National Natural Science Foundation of China (51978019)

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    摘要:

    砂土地层盾构隧道施工过程中,合理的支护力对于开挖面的稳定性至关重要。其计算方法在深埋与浅埋工况下是有明显差异的,但是目前的研究未给出深、浅埋的明确界定。借助已有刚性截锥体破坏模式,将土压力理论的一般性与极限分析法的严格性结合,提出了适用于深、浅埋不同工况的计算方法。最后,利用理论解析法与数值模拟方法对山西中部引黄工程某标段区间盾构隧道段进行开挖面稳定性分析,理论解析法与数值模拟所得极限支护力相互印证,但理论解析法计算更为便捷,为砂土地层盾构隧道的工程实践提供借鉴与指导。

    Abstract:

    During the construction of shield tunnel in sandy soil layer, a reasonable support pressure is essential to the stability of the tunnel face. The calculation method is obviously different between deep and shallow burying conditions, but the current research does not give a clear definition of deep and shallow burying. With the aid of the existing rigid truncated cone failure mode, combining the generality of the earth pressure theory with the rigorousness of the limit analysis method, a calculation method suitable for different working conditions of deep and shallow burial is proposed. Finally, the theoretical analysis method and numerical simulation method are used to analyze the stability of the tunnel face of a shield tunnel section of a bid section of the Central Shanxi Yellow River Diversion Project. The limit support pressures obtained from the theoretical analysis method and the numerical simulation are mutually confirmed, but the calculation of the theoretical analysis method is more convenient, and it provides reference and guidance for the engineering practice of shield tunnels in sandy soil.

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王林,万涛,狄启光,等. 砂土地层盾构隧道开挖面成拱临界深度分析[J]. 科学技术与工程, 2021, 21(30): 13078-13085.
Wang Lin, Wan Tao, Di Qiguang, et al. Research on Critical Arching Depth and Ultimate Supporting Force of Shield Tunnel Excavation Surface in Sandy Ground[J]. Science Technology and Engineering,2021,21(30):13078-13085.

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历史
  • 收稿日期:2021-01-22
  • 最后修改日期:2021-08-31
  • 录用日期:2021-08-04
  • 在线发布日期: 2021-11-10
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