Sensitivity Research on a Construction Space for a Multi-Partition Excavation Tunnel

In order to improve the mechanical and deformation performance of surrounding rock and supporting structure in the construction of multi-partition excavation tunnel, and improve construction safety. Based on the tunnel construction mechanical properties and principle of orthogonal test design, multiple conditions three-dimensional numerical simulation study on construction space is carried out by finite element software for cross diaphragm with step method, CRD method and CD method applied to partial excavation tunnel commonly. Comparatively analyze response characteristics in aspect of crown settlement, surface displacement and supporting structure stress in different conditions, reveal influence rule about deformation and stress state of multi-partition excavation tunnel in different construction space. In the meantime, consider the maneuverability of the actual construction, then put forward reference comments to select reasonable construction space for multi-partition excavation tunnel, and the final purpose is to guide the construction.