The basic characteristics

analysis peculiarity and constitutive model of software FLAC3D are introduced. The simulated project is set up based on analyzing the geological conditions and utilizing the hydro-geological model of half infinite space. According to the specific geological and engineering conditions of a certain subsea tunnel

the use of the soft FLAC3D in water inflow computation by taking nine typical profiles as examples is explained. Based on the analysis and comparing the calculation results between analytical method and numerical simulation

the applicable work conditions of the software are summarized. At the same time

some beneficial conclusions are summarized which can be references for tunnel construction organization design and drainage design.