隧洞洞挖及一次支护方案

Tunnel Excavation and One Time Support Scheme

文章通过位于某水库右岸引水隧洞的施工过程从岩石力学的观点出发,运用新奥法施工原理对隧洞洞挖及一次支护施工方案进行了阐述。隧洞在开挖过程中,蕴藏在山体中的地应力由于开挖成洞而产生再分配,承载地应力的主要是围岩体本身。使围岩体自身的承载能力得到最大限度的发挥,同时起到了安全储备和装饰美化作用。

In line with the construction process of a water diversion tunnel located on the right bank of a reservoir,based on the view of rock mechanics,this paper applied the theory of New Australian Tunnelling Method（ NATM） to describe tunneling and one time support scheme. The crustal stress contained in the mountainous body generated redistribution due to excavation during the process of tunnel excavation,and the bearing stress was mainly the surrounding rock body itself,which resulted in the limited effects of the bearing capability of surrounding rock,meanwhile,taking the roles of safe storage and decorating and beautifying.