Study on Stability Quantitative Evaluation Standard of Surrounding Rockalong Tunnel with Top Soft and Bottom Hard Stratum
ZHAO Wen-juan
WU Bo
Abstract：With the finite element numerical calculation,an analysis study was conducted on the stability quantitative evaluation standard of the tunnel surrounding rock in a typical top soft and bottom hard stratum.The top section was a V grade surrounding rock and the bottom section was II grade surrounding rock.The paper firstly determined a max subsidence value of the arch roof and a safety coefficient reflected the destructed features of the tunnel and the strict mechanics basis as the double index to evaluate the stability of the tunnel surrounding rock.Then with the numerical simulation,a study was conducted on the surrounding rock stability of the tunnel in the top soft and bottom hard stratum.According to the self stability curve of the surrounding rock,a group division was conducted and thus the quantitative evaluation standard of the surrounding rock stability in the typical top soft and bottom hard stratum was established.The study results would play a fine and supplementary role to the grading standard development of the surrounding rock stability in the complex stratum tunnel and could provide the references to the design and construction of the top soft and bottom hard complex stratum.
Keywords：top soft and bottom hard stratumsurrounding rock along tunnelstabilityevaluation indexevaluation standard
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 35-38,47 )