Sensibility Analysis of Underground Excavation Stability Based on the Hoek-Brown Strength Criterion

Based on the nonlinear strength criterion,Hoek-Brown strength criterion,the sensibility of underground excavation stability on mechanical parameter and in-situ stress using the stability degree(SD) is researched.Conclusions can be drawn as follows: the SD is decreased with increasing of the k while σ3 is invariable,σ1-σ3 increase while σ1 is invariable.the SD is increased with increasing of the GSI,mi and σci.