The construction stability of large section tunnel considering the deterioration of clay mechanical properties

The stability of large-section clay tunnels is closely related to the mechanical behavior surrounding rock. rock characterized by coupled response physico-mechanical properties material and tunnel construction conditions. Therefore, this paper proposes a numerical experimental study based on surface method quantitatively link with factors. It will provide basis for guiding plan adjustment ensure its stability. Firstly, reserve evaluated considering deterioration rocks, relationship between index factors established according Taylor’s theorem. Secondly, steepest ascent are used find optimal fitting factor Finally, analysis application shows that (a) evaluation physical well representative; (b) “curved” region can be effectively determined slope method; (c) region, second-order more appropriate. This research reveal coupling stability, clay, conditions, which contribute development intelligent construction.