Aiming at the key technology problem of construction period surrounding rock formation influencing factors complexity in Dalian high-tech zone subway, comprehensive using combination Three-Dimensional Fast Lagrangian Analysis Finite Difference numerical simulation and Orthogonai Design to analysis its sensitivity, and various factors affecting to the formation quantitatively and qualitatively.Select include soft-layer thickness, deformation parameters, strength parameter etc.six factors, structure 5 level orthogonal design sample, simulate and analysis the displacements of tunnel's ground settlement, crown settlement, pipeline, tunnel convergence through three-dimensional numerical simulation, obtain the six parameters in sequence of range and sensitivity.This tunnel parameter analysis method makes full use of advantages of orthogonal design and Three-Dimensional numerical simulation.Orthogonal design using finite number of test combinations to experiment and simulate parameter's all-around properties, significantly decreased test workload.Three-Dimensional Fast Lagrangian Analysis Finite Difference numerical simulation calculates fast, and can sufficiently reflect the interaction of structure surrounding rock mass and three dimensional effect nearby the tunnel face.Through the calculation, it is found that soft-layer thickness has a great influence on settlement, next came young modulus and then Poisson's ratio has a big effect to Lateral Deformation.Simulation results have the important guiding significance on construction reasonably.
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