隧道围岩抗剪强度参数的图表研究

Graphical Study of Shear Strength Parameters of Tunnel Surrounding Rock

基于Hoek-Brown(HB)准则提出了用于估算岩质隧道围岩Mohr-Coulomb(MC)抗剪强度参数(c和Φ)的图表。首先,本文确定了强度比σci/(γH)和等效MC抗剪强度参数(c/σci和Φ)之间的理论关系。研究发现c/σci和Φ的值仅取决于强度比σci/(γH)的大小,不与σci、γ和H中某一个参数的大小相关。基于强度比与等效MC抗剪强度参数之间的关系,本文提出了用HB参数来估算隧道围岩的等效MC抗剪强度参数的图表。本文提出的图表可用于快速获取隧道围岩的抗剪强度参数值。

Charts are used to quickly estimate the deformation of rock mass and the stability of rock slope,but the charts which can be used to estimate the shear strength parameters of tunnel rock mass are limited.Based on the Hoek-Brown criterion,charts which can be used to estimate the shear strength parameters(c andΦ)of Mohr-Coulomb criterion of tunnel rock mass are proposed in this paper.We firstly present the theoretical relationships between the MC parameters(c andΦ)andσci/(γH).It is found that the value ofc/σcianddepend only on the magnitude ofσci/(γH),regardless of the magnitude of the individual parametersσci、γand H.Based on the relationships between the MC parameters(c andΦ)andσci/(γH),charts are plotted to show the relations between the MC parameters and HB parameters.Using the proposed charts can make a rapid estimation of shear strength of tunnel rock masses.