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首页> 外文期刊>KSCE journal of civil engineering >Analytical approach for support mechanism of feet-lock pipe combined with steel frame in weak rock tunnels
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Analytical approach for support mechanism of feet-lock pipe combined with steel frame in weak rock tunnels

机译：弱岩隧道脚锁管与钢框架结合的支撑机理分析方法

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摘要

In the past few decades, an effective support method, i.e., adopting feet-lock pipe combined with steel frame, has been successfully applied to the settlement control in excavation of many weak rock tunnels. However, the mechanism of this combined support has not yet well been understood, and there is a lack of a general approach to explain it. This paper aims to present an analytical approach to explain and evaluate the mechanism of this support. First, an arch model with elastic supports and an elastic foundation beam model are established respectively to model the steel frame and feet-lock pipe. With the force and deformation compatibility conditions between the two members, the formulae for calculating the deflection and internal forces of the feet-lock pipe are derived. The theoretical support effects of the feet-lock pipe are calculated and compared with the existing studies through case studies. Then, with two cases of under symmetrical and unsymmetrical earth pressures being considered, the mechanical behaviors of the feet-lock pipe are analyzed in detail. Finally, a parametric study of an example tunnel is conducted in detail.
机译：在过去的几十年中，一种有效的支撑方法，即采用脚锁管与钢框架相结合，已成功地应用于许多弱岩隧道的开挖控制中。但是，对这种联合支持的机制尚不十分了解，因此缺乏解释它的一般方法。本文旨在提供一种分析方法来解释和评估这种支持的机制。首先，分别建立了具有弹性支撑的拱形模型和弹性基础梁模型，以对钢框架和脚锁管进行建模。根据两个构件之间的力和变形相容条件，推导了脚锁管挠度和内力的计算公式。计算了脚锁管的理论支撑效果，并通过案例研究将其与现有研究进行了比较。然后，在考虑对称和不对称土压力的两种情况下，详细分析了脚锁管的机械性能。最后，详细研究了示例隧道的参数。

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