The numerical simulation analysis on safety stability in underground space of urban track transportation system

In order to study and demonstrate the safety condition of urban track transportation system in mechanics area, and to determine the key points and difficulties of this system, it uses FLAC3D numerical simulation software, combines the applied examples of engineering projects, carries on simulation analysis on aspects of surrounding soil's deformation rule during construction stages, the mechanics analysis during main structure's construction, and the system surrounding soil's stress-strain rules during operation stages, etc.. Feasible safety measures and suggestions were proposed accordingly. The applied research indicates that the numerical simulation analysis can express the risk characteristics and rules well during engineering construction and after construction, and further avoid potential hazards or accidents' occurrence, which has important meanings for ensuring the safety of engineering projects during the whole process.