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.