Applicability of the Generalized Zhang-Zhu Criterion in the Numerical Analysis of Deep Buried Tunnel
The intelligent construction of deep rock tunnel is an important development trend of tunnel construction.In order to accurately simulate the three-dimensional stress state of deep rock mass and improve the precision of numerical calculation of deep tunnel,the generalized Zhang-Zhu rock mass strength criterion(GZZ criterion)is introduced into the numerical analysis of deep tunnel.The applicability of the GZZ criterion in numerical analysis of deep buried tunnels is studied from the characteristics,parameters and engineering applications of rock mass strength criterion.The results show that:1)From the perspective of criterion characteristics,the GZZ criterion can reflect the nonlinear characteristics of deep rock mass and the effect of intermediate principal stress,which is suitable for numerical analysis of deep buried tunnels.2)From the point of parameter selection,a GZZ criterion parameter acquisition method is proposed,which is conducive to improving the applicability of the GZZ criterion.3)The engineering case shows that the GZZ criterion has high calculation accuracy in the numerical analysis of deep buried tunnels,and the difference of surrounding rock deformation calculated by the generalized Hoek-Brown criterion reaches 23%-30%.The GZZ criterion is recommended for deep buried rock mass engineering calculation.
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