加筋喷混凝土拱肋支护效应的数值模拟

挪威隧道施工法提出的加筋喷混凝土拱肋支护在国内外工程实践中被证明是一种经济、高效的软弱围岩支护结构。为更好地分析加筋喷混凝土拱肋对软弱围岩的支护效应,以挪威Finnfast海底隧道软弱围岩段为工程实例,结合围岩质量Q系统分类方法,利用有限差分法对比研究了采用和不采用加筋喷混凝土拱肋2种方案下软弱围岩的变形、应力分布规律及屈服区体积。研究结果表明加筋喷混凝土拱肋对软弱围岩具有良好的加固效果。

Numerical Analysis of Supporting Effects of the Reinforced Ribs of Sprayed Concrete

The reinforced ribs of sprayed concrete(RRS) in the Norwegian Method of Tunneling has been proved to be an economical and efficient supporting structure for the weak surrounding rock engineering in China and abroad. The weak zone in the Finnfast subsea tunnel in Norway was taken as a case study to demonstrate the supporting effects of RRS on weak surrounding rock. In view of the Q system for the classification of surrounding rock quality, finite difference method was employed to compare the deformation, the stress distribution, and the yield volume of surrounding rock in the presence and in the absence of RRS. The results show that RRS has good supporting effects on weak surrounding rock.