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首页> 外文会议>International Symposium on Modern Tunneling Science and Technology (IS-Kyoto 2001), Oct 30-Nov 1, 2001, Kyoto, Japan >A new urban tunnelling method adopted to the soft ground with high groundwater level
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A new urban tunnelling method adopted to the soft ground with high groundwater level

机译：高地下水位软土地基的新型城市隧道法

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摘要

Since tunnels in urban areas are, in many cases, driven through soft ground and in locations close to various utilities and structures, maintaining the stability of not only the tunnels but also such nearby existing structures is of utmost importance. Besides, the presence of groundwater could greatly affect the stability of the cutting face during excavation. To solve these problems, Mito Tunnel, constructed by NATM, adopted a new auxiliary system for minimizing displacements as well as that for controlling groundwater. Several new approaches, including ground improvement which stabilize the foot of top heading by a special jet grouting (hereafter called the "X-Jet method"), forepiling with long steel pipes, and drainage system specially designed for unconsolidated ground with high groundwater level, were adopted to ensure the safety of tunnel construction.
机译：由于在许多情况下，城市地区的隧道是通过软土地基以及靠近各种公用事业和构筑物的位置打入的，因此，不仅要保持隧道的稳定性，而且要保持附近这种现有结构的稳定性至关重要。此外，在开挖过程中，地下水的存在会极大地影响切割面的稳定性。为了解决这些问题，由NATM建造的水户隧道采用了新的辅助系统，以最大程度地减少位移以及控制地下水。几种新方法，包括通过特殊的射流灌浆（以下称为“ X-Jet方法”）使地面稳定的方法，以长钢管为前途以及专门为高地下水位的疏松地面设计的排水系统，为了确保隧道施工的安全性而采取的措施。

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