The Influence of the High Geostress Tunnel Construction on Surrounding Rock Stress and Deformation

Based on the stability theory of surrounding rock and through the numerical simulation method,according to some classes of surrounding rock of bigger parameter changes and the same kind of surrounding rock in the small scope parameter changes,the forms of surrounding rock stress and deformation are different in the high geostress circular tunnel excavation,a lot of established numerical models are analyzed.Studies show that in the good surrounding rock tunnel the high ground stress concentration problems are to be solved,and in the weak rock tunnel the deformation problems are to be solved.When the parameters of surrounding rock change little,the parameters from big to small which have the influence on the surrounding rock stress are in turn the internal friction angle,cohesion,poisson ratio,and elastic modulus,and the parameters from big to small which have the influence on the surrounding rock deformation are in turn the elastic modulus,cohesion,internal friction angle,and poisson ratio.