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1.定义所谓NATM,是一种隧道施工方法,系新奥地利隧道施工法(New Austrian Tunnelling Method)的简称。它是奥地利的腊布希维兹教授于1963年命名的。本方法不是给出隧道施工的次序,而是根据岩体力学的理论,积极地利用围岩本身具有的支持力,或者研究保持围岩、隧道的主要因素来谋求隧道稳定的。 2.NATM的支护理论随着隧道的掘进,洞边的岩体处于平衡状态时的径向应力б~r。(或者,与它相应的衬砌反力)如图——1所示,若变形的话,则内径减小。
1. Definitions The so-called NATM is a method of tunnel construction, short for the New Austrian Tunnelling Method. It was named after Professor Rabschwitz in Austria in 1963. This method does not give the order of tunnel construction. Instead, it uses the theory of rock mechanics to actively use the supporting power of the surrounding rock, or to study the main factors of maintaining the surrounding rock and tunnel to seek stability of the tunnel. 2. NATM support theory With the tunnel excavation, the radial stress б~r of the rock mass in the hole is in balance. (Or, corresponding to its lining reaction force) as shown in Figure -1, if deformed, then the inner diameter decreases.