总结分析了目前高速铁路大断面软弱围岩或土质隧道施工中存在的问题，认为如何处理好掌子面前方的“待挖核心体”是控制此类隧道整体稳定性的关键，运用沿隧道纵向全断面预加固的易切削玻璃纤维锚杆来提高“待挖核心体”的等效刚度，控制“待挖核心体”的变形，使得隧道周边的拱效应能自然发挥作用，可以保证隧道能够全断面安全、顺利开挖掘进。介绍了隧道全断面预加固技术的一些基本概念，并运用有限元方法对隧道全断面预加固进行了三维数值模拟，同时阐述了设计施工的基本应用原理，为该法在我国的应用、推广提供了一定的理论支持。

The key of maintaining the tunnel stability lies on how to deal with the advance core soil ahead of working face, which is obtained on basis of analysis on the problems in high speed railway tunnels with big crosssections in soft surrounding rock or soil. Fullface prereinforcing method by fiberglass bolts can enhance the equivalent rigidity of the advance core soil and control the deformation of the advance core soil, so that arch effect can play its role naturally and assure the excavation safety. The paper presents some basic concepts for the fullface prereinforcing method by fiberglass bolts and takes the finite element method to implement 3D numerical simulation of this construction method. Simultaneously, the basic application principle of this method in design and construction is presented. This paper can provide theoretical support for the application and popularization of this method in tunnel construction.