广义章-朱准则在深埋隧道数值分析中的适用性研究

Applicability of the Generalized Zhang-Zhu Criterion in the Numerical Analysis of Deep Buried Tunnel

深部岩体隧道的智能建造是当今隧道工程建设的重要发展趋势。为准确模拟深部岩体的三维应力状态,提高深埋隧道数值计算精度,将广义章-朱岩体强度准则引入深埋隧道数值分析中,采用理论分析和数值计算相结合的方法从岩体强度准则的特性、参数以及工程应用3个角度对广义章-朱准则在深埋隧道数值分析中的适用性展开研究。结果表明:1)从准则特性的角度,广义章-朱准则能反映深部岩体的非线性特征以及中间主应力效应,适用于深埋隧道数值分析;2)从参数选取角度,提出了一种广义章-朱准则参数估算方法,有利于提高广义章-朱准则的适用性;3)工程案例表明广义章-朱准则具有较高的计算精度,在深埋条件下采用广义Hoek-Brown准则计算得到的围岩变形误差达到23%~30%,建议采用广义章-朱准则进行深埋隧道数值分析。

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.