采用新奥法施工隧道的应力分析特点

STRESS ANALYSIS CHARACTERISTICS OF THE TUNNEL CONSTRUCTED BY NEW AUSTRIAN TUNNELING METHOD

隧道支护结构应力分析习惯于采用平面应变问题来处理。当隧道采用新奥法施工时,按平面应变问题来处理则是不完善或不正确的。因为采用新奥法施工的隧道,其喷锚支护是随着隧道开挖紧跟着掌子面完成的,其应力状态相当复杂而且基本上属于三维问题,非采用一般平面分析方法所能解决。本文目的在于建立一个模拟隧道掘进与支护过程的三维计算模型,用以解决新奥法施工隧道的应力分析。

In the tunnel support construction stress analysis, it is conventional to use two dimen-sional strain principle. However this mathod is imperfect when tunnel is constructed by theNATM. An important reason is rock-bolting. and shotcrete lining are applied closely follow-ing the working face which is excavated, the stress state is three dimensions and is very com-plicated during the stress analysis is not solved by planar strain principle. The aim of this pa-per is to set up a three dimensional calculate model which is used to model an excavating andsupporting process of the tunnel and to solve the stress analysis of the tunnel constructed byNATM.