收敛约束法中隧道开挖面空间效应方法比较

合理的开挖面空间效应方法是充分调动与发挥围岩自承载能力的前提，对2种代表性的开挖面空间效应方法：T-N(09)支护力系数法和V-D(09)位移释放系数法，进行了来源、因素考虑、适用范围、空间效应实现及收敛约束差异等的定性与定量比较。研究结果表明：2种开挖面空间效应方法都易与围岩特征曲线相结合，便于实际工程应用，且在一定参数范围内二者具有很好的一致性；T-N(09)支护力系数法仅适用于理想弹-塑性围岩，得到的支护压力偏小、围岩稳定变形偏大，应对其材料模型及参数范围进行有效拓展；V-D(09)位移释放系数法适用于各种弹塑性围岩，能较直观地反映开挖面空间效应的变化及影响范围，具有广泛的工程应用前景。

Comparisons of spatial-effect approaches for tunnel excavation using convergence-confinement method

A proper spatial effect approach of excavation face is the premise to make full use of the self-bearing capacity of rock mass. In this study, two representative spatial effect approaches of excavation face, i.e., the support stress coefficient approach of T-N (09) and the displacement release coefficient approach of V-D (09), are compared qualitatively and quantitatively about their sources, influencing factors, scopes of application, performances of spatial effect and differences of convergence-confinement and so on. It is found that the two spatial effect approaches of excavation face are both readily combined with ground response curve to practical engineering applications and have good consistency in some range of parameters; the support stress coefficient approach of T-N (09) is only suitable for elastic-perfectly plastic rock, which leads to a smaller support pressure and a larger stable deformation of rock mass, and thus the related material models and parameter ranges should be properly improved. The displacement release coefficient approach of V-D (09) can be applied to various elastoplastic rocks, directly reflecting the changes and influence ranges of spatial effect of excavation face, and thus it has a wide range of engineering applications.