首页> 外文会议>International Conference on Soil Mechanics and Geotechnical Engineering(16 ICSMGE) vol.3; 2005; Osaka(JP) >Design and numerical investigations of a deep excavation for a tunnel entrance pit
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Design and numerical investigations of a deep excavation for a tunnel entrance pit

机译:隧道进洞深基坑的设计与数值研究

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摘要

For the crossing of the Trave river in Luebeck, Germany, a new shield tunnel is constructed to replace the existing Bridge. At its entrance the tunnel changes into an open 130 m long pit. In order to carry out the excavation of the open pit, it was necessary to remove the existing access road of the bridge and redirect the existing federal highway to a temporarily constructed road on a 12.5 m high cofferdam. This results in a total height difference of about 25 m from the top of the cofferdam to the bottom of the open excavation. In order to analyse the unpredicted deformations during the execution of the excavation, a numerical analysis of the excavation was performed. The paper presents the construction and design of the retaining structures together with the 12.5 m high cofferdam and shows a detailed description of the boundary conditions and the execution of the numerical computations. Typical result of the field measurement are graphically plotted and described in comparison with the results of the numerical computations. Finally, the measures required for the completion of the excavation without any danger of excessive deformations are discussed and presented.
机译:为了穿越德国吕贝克的特拉夫河,修建了一条新的盾构隧道,以取代现有的大桥。在其入口处,隧道变为一个长130 m的露天坑。为了进行露天矿的开挖,有必要拆除桥梁的现有通道,并将现有的联邦公路改道至高12.5 m的围堰上的临时修建道路。从围堰顶部到开挖底部的总高度差约为25 m。为了分析开挖过程中的意外变形,对开挖进行了数值分析。本文介绍了挡土结构以及12.5 m高的围堰的结构和设计,并对边界条件进行了详细描述,并进行了数值计算。图形化地绘制了现场测量的典型结果,并与数值计算结果进行了比较。最后,讨论并介绍了完成开挖所需的措施,而没有任何过度变形的危险。

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