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上硬下软地层盾构隧道开挖面极限支护力分析
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Analysis of Limit Supporting Force of Tunnel Excavation Face for Shield Machine in Upper-hard Lower-Soft Ground
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    摘要:

    极限支护力是保证盾构隧道开挖面稳定性的关键参数.但目前鲜有学者研究上硬下软地层中盾构隧道开挖面极限支护力的现状.本文基于极限平衡法和筒仓理论,假设破坏面为折线,建立了适用于该地层的盾构隧道开挖面极限支护力计算模型,并得到其计算公式;进而对该地层模型进行数值模拟.结果表明,与不考虑地层分层的传统方法相比较,本文方法与数值计算结果更为吻合,证明了当开挖面横跨上硬下软地层时考虑分层的必要性.在此基础上,对埋深、上下土层厚度及土体强度指标等参数对极限支护力的影响进行了分析.结果表明:当上下地层土质不同时,考虑分层与否所得的极限支护力差异较大.因此,上硬下软地层不能等同于均质土层,在工程实践中需予以考虑.

    Abstract:

    Limit support pressure is a key parameter to keep the stability of the excavation face in shield tunnel excavation, but there has been little research on the limit supporting force of tunnel excavation face for shield machine in upper-hard lower-soft ground. Based on the limit equilibrium method, silo theory and hypothesis of sliding surface being a broken line, the limit supporting force calculation model and formula of excavation face for shield tunnel in upper-hard lower-soft ground were established. To check the rationality of the model and the necessity of considering layers, comparative numerical analyses were conducted. The agreement between the two methods is very good. The effect of buried depth, thickness of upper and lower soil layer, cohesion and internal friction angle on limit support force was analyzed. It shows that the results are different when considering layered or not when the layer is uneven. Therefore, it cannot be equated with homogeneous soil, which should be considered in engineering practice.

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赵明华,毛 韬,牛浩懿,刘 猛.上硬下软地层盾构隧道开挖面极限支护力分析[J].湖南大学学报:自然科学版,2016,43(1):103~109

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  • 在线发布日期: 2016-02-29
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