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首页> 外文期刊>Australian Geomechanics >REVISITING THE APPLICABILITY OF VOUSSOIR BEAM THEORY FOR TUNNEL DESIGN IN SYDNEY
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REVISITING THE APPLICABILITY OF VOUSSOIR BEAM THEORY FOR TUNNEL DESIGN IN SYDNEY

机译：回顾Voussoir梁理论在悉尼隧道设计中的适用性

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The design of semi flat-roofed tunnels, i.e. with a high arch radius to roof span ratio, in Sydney has been proven successful over time. The horizontally bedded nature of Sydney's Hawkesbury Sandstone draws designers to the voussoir beam theory. Such analogy and the associated method of analysis can be easily implemented in computer spreadsheets, which significantly facilitates the design of semi flat-roofed tunnels in geological conditions such as Hawkesbury Sandstone. Like any other engineering simplified model or theory, the voussoir beam theory has some limitations. However, it seems that some of these limitations are not well understood and often ignored and/or misinterpreted. Such lack of understanding of the theory and its limitations often raises question about the applicability of the analytical solution in practice, misleading engineers to believe that the only reliable and comprehensive design method is through numerical analysis such as Distinct Element Method (DEM). This paper investigates the applicability of the analytical or closed-form solution of the voussoir beam theory through comparison with numerical modelling, focusing on some of the perceived limitations and their impact on the design of tunnels in Sydney. The results illustrate that the voussoir beam theory can be confidently used in practice if its limitations are well understood and good engineering judgment is applied to take the local geology into account. In addition, the results also demonstrate that some of the limitations can be on the conservative side. For example, the potentially positive effect of high horizontal stresses ignored in the voussoir beam theory may explain why some of the unfavourable conditions are less pronounced in practice.
机译：随着时间的推移，已证明在悉尼设计具有高拱半径与屋顶跨度比的半平屋顶隧道是成功的。悉尼霍克斯伯里砂岩的水平层状性质将设计者吸引到了伏索梁理论。这样的类比和相关的分析方法可以在计算机电子表格中轻松实现，从而极大地方便了在诸如霍克斯伯里砂岩等地质条件下设计半平顶隧道。像任何其他工程简化模型或理论一样，容积梁理论也有一些局限性。但是，似乎其中一些局限性没有得到很好的理解，并且常常被忽略和/或误解。缺乏对理论及其局限性的了解经常使人们对分析解决方案在实践中的适用性提出疑问，使工程师误认为唯一可靠且全面的设计方法是通过数值分析，例如离散元方法（DEM）。本文通过与数值模型进行比较，研究了Voussoir梁理论的解析或封闭形式解决方案的适用性，重点研究了一些可感知的局限性及其对悉尼隧道设计的影响。结果表明，如果能很好地理解其局限性，并运用良好的工程判断力来考虑当地的地质情况，就可以在实践中放心地使用voussoir梁理论。此外，结果还表明，某些限制可能在保守方面。例如，在沃索尔梁理论中忽略了高水平应力的潜在积极影响，这可以解释为什么某些不利条件在实践中不太明显。

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