Sensitivity Analysis of Factors Affecting the Stability of Deep Buried Tunnel

The excavation of deep tunnels has significant spatial and temporal effects on the stress distribution surrounding rock. Accurately describing characteristics rock state is a key issue in analyzing failure mechanism Based numerical analysis, study influencing factors during was conducted. results show that (i) divided into mutation, disturbed, stables zones using quantitative index: peak stable value triaxiality, which can reflect influence principal orientation; (ii) evolution law path rocks different areas obtained, detailed loading method laboratory test proposed, could consider magnitude orientation tunnel excavation; (iii) five variable indices were used to conduct sensitivity analysis state. Specifically, direction situ lateral pressure coefficient considerably influences disturbance range, depth buried affects deformation This paper provides modified quantified for stability analysis.