Study on Factor Affected to Instable Failure of Surrounding Rockalong Tunnel with Top Soft and Bottom Hard Stratum
ZHAO Wen-juan
WU Bo
Abstract：An orthogonal test and range analysis combined method was applied to an analysis comparison on the tunnel span W,the buried depth h,high span ratio λ,tunnel excavation method and tunneling size as well as other engineering factors affected to the stability of the top soft and bottom hard stratum.When the soft and hard strata were differently combined,the paper had an analysis and study on the stability of the tunnel in the top soft and bottom hard strata under the joint role of the W,h,λ,parameter β at the location of the interface structure in the soft and hard strata,the physical mechanics parameter Ds of the top soft strata,the physical mechanics parameter Dx of the bottom hard strata and other geological factors as well as the engineering factors.The results showed that W and h were the two major factors in the engineering factors affected to the stability of the tunnel in the top soft and bottom hard strata and λ was the secondary factor.After the tunnel was excavated,when the tunnel self was stable,W was the major factor affected to the stability of the tunnel under the joint role of the geological factor and engineering factor and whereas W would be Ds.
Keywords：top soft and bottom hard stratumtunnelinstable failuresensibility analysisstability
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：7( 53-58,27 )