Numerical Simulation Study on Damage and Failure of Surrounding Rock in Large-span Flat Caverns
In view of the unfavorable structural characteristics of the large-span flat arch,the numerical simulation scheme was designed using orthogonal experiments to systematically study the changes in stress and strain of surrounding rock under the influence of factors such as rock mass grade,burial depth,span,and flatness.The main control factors of stress index and deformation index are found by global sensitivity analysis,the boundary standards of tunnel vault span under surrounding rock are determined,and the influence rules of main control factors are analyzed.
large-span flat archglobal sensitivitystress indexacoustic deformation index
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