The dynamic interaction of twin tunnels embedded in a homogeneous half-space
The dynamic interaction of twin tunnels embedded in a homogeneous half-space
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DOI：
10.7712/120115.3385.1434
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发表时间：
2015
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影响因子：
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通讯作者：
W. Hamad;H. Hunt;J. Talbot;M. Hussein;D. Thompson
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文献类型：
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作者：
W. Hamad;H. Hunt;J. Talbot;M. Hussein;D. Thompson
地下铁路所产生的振动可能是对附近建筑物的居住者造成干扰的主要来源。地基振动的数值预报是一个复杂的问题，在过去的几十年里得到了广泛的研究关注。然而，简化的假设总是需要在国家的最先进的数值模型，以减少计算工作量和资源。一个常见的简化假设是忽略相邻隧道的存在，尽管世界各地的许多地下铁路线由两条隧道组成。本文研究了均质半空间中两条平行隧道的动力相互作用。两种不同的方法被用来解决这个问题。第一种是完全耦合的方法，其中在隧道耦合的半空间中产生两个腔。第二种方法采用叠加法，将单隧道的两个子模型叠加，计算双隧道的振动响应。在这两种建模方法中，隧道壁采用厚壳理论建模，而边界元法用于模拟地面的半空间。研究了双隧道体系在一个隧道仰拱处简谐点荷载作用下的地表振动响应，并与单隧道进行了比较。叠加法在模拟双隧道的动态相互作用的效率进行评估，对完全耦合的方法在不同的点上的表面。计算结果揭示了双洞相互作用的重要性，也验证了叠加法的准确性。本文还强调了叠加法模拟隧道与桩基动力相互作用的可行性。
Vibration generated by underground railways can be a major source of disturbance to occupants of nearby buildings. The numerical prediction of ground-borne vibration is a complicated problem that has received extensive research attention in the past decades. However, simplifying assumptions are always required in state-of-the-art numerical models in order to reduce computational effort and resources. A common simplifying assumption is to neglect the presence of a neighbouring tunnel, despite the fact that many underground railway lines around the world consist of two tunnels. This paper investigates the dynamic interaction of two parallel tunnels embedded in a homogeneous half-space. Two different methods are used to tackle the problem. The first is a fully coupled approach, where two cavities are generated in the halfspace to which the tunnels are coupled. The second adopts a superposition approach, where two sub-models each consisting of a single tunnel are superposed to calculate the vibration response of the twin tunnels. In both modelling approaches, the tunnel wall is modelled using the thick-shell theory, while the boundary element method is used to simulate the half-space of the ground. The vibration response of the twin-tunnel system on the ground surface due to a harmonic point load at one tunnel invert is studied and compared to that of a single tunnel. The efficacy of the superposition method in modelling the dynamic interaction of the twin tunnels is assessed against the fully coupled approach at different points on the surface. The results reveal the significance of the interaction between the twin tunnels and also demonstrate the accuracy of the superposition method. The feasibility of the superposition method in modelling the dynamic interaction between tunnels and piled-foundations is also highlighted.