利用ABAQUS模拟NATM隧道施工过程

在分析了NATM(新奥法)施工理念的基础上，详细地说明了隧道施工中的2个关键问题：隧道开挖后洞周应力的计算和隧道的开挖施工过程。然后在此基础上，利用大型非线性有限元软件ABAQUS对隧道的施工过程进行显示模拟，从计算得到的结果可以看出，利用有限元方法可以非常清晰直观地模拟隧道的施工过程，并能计算得到相应的应力、位移等计算结果，为设计隧道和施工提供了比较合理的理论支持。

Utilizing ABAQUS modeling new Austrian tunneling method process

The high cost of urban space has significantly increased the demand for tunnels in big urban centers. In such areas, settlement induced by the tunnel excavation may cause serious damage to nearby structures. Therefore, it is necessary to investigate effective means of controlling tunnel-induced settlements. In many countries, tunnel in soil and rock mass are constructed using new Austrian tunneling method (NATM) for its flexibility to adapt to different ground conditions and use of simple equipments. Ago, tunnel designs by NATM are generally based on empirical methods taking into account local experiences. But this method is said to be observational and cannot illustrate the construction process and the stress and strain changing. So that, with the developing of PC and numerical method, using FEM and other method have been utilized in geotechnical engineering. At first, the paper shows the principles of NATM, and illustrating the two key: excavating unloading node force on the tunnel boundary and constructing steps. And on the base of above illustration, utilizing finite element code ABAQUS analyzing and modeling a tunnel. From obtained results, it is shown that the finite element method can model tunnel constructing process reasonably.