围岩变形内表比及一种新的巷道围岩分类法

Ratio of internal to external deformation of surrounding rocks and a new kind of classification for tunnel surrounding rocks

根据现场实测资料和数值模拟计算结果，研究了几种不同类型巷道围岩变形规律，提出更能反映围岩变形规律和变形状态的"内表比"概念，进而考虑依据巷道围岩表面变形量和内表比值两个参数，提出一种新的巷道围岩分类法，并根据各种支护所容许的极限变形量，给出相应的合理支护形式。

Based on a great deal of in-situ measured deformation data in tunnel surrounding rocks and the results of numerical simulation, the authors have studied some laws of surrounding rock deformation for two kinds fo soft rock tunnels,then advanced a new concept-ratio of internal to external deformation of surrounding rock which indicates intrinsically the state of deformation of surrounding rock.with the deformation magnitude of the tunnel surface and the value of ratio of surrounding rock, the authors have put forwrd a new kind of classification for tunnel surrounding rocks which is believed to be better that existing classification used for selecting bolting support.