Application of Midas GTS Three Dimensional Numerical Simulation New Technology to the Stability of Hole Wall in HDD Engineering

Analysis of stability of hole wall has been an important technical problem in HDD engineering, but it's difficult to know whether hole wall is instability or not in actual drilling engineering. This paper was analysis of the main factors (Mechanical parameters of rock and soil, slurry pressure) that influence stability of hole wall, and then Midas GTS (Geotechnical and Tunnel analysis System) three dimensional numerical simulation software was used to simulate instability process of the rock and soil mass around hole wall in HDD, it calculated which stress, strain and displacement, and obtained calculation results in the form of corresponding vector cloud pictures. It can determine whether the hole wall is instability or not by this calculation results. This is the first application of GTS three dimensional numerical simulation new technology in HDD engineering. Practice has proved that this new technology is accord with fact and useful for project construction, it is worth to be applied to HDD engineering.