Abstract
Tunnel risk assessment plays an important role in tunnel design, construction and tunnel safety risk control. TBM method is more and more widely used because of its comprehensive advantages, especially in the diversion tunnel engineering. Because the geological conditions in the long tunnel are complex and changeable, TBM machines are extremely sensitive to the changing of geological conditions, various risks may occur during the TBM tunnel construction. But the risks are difficult to assess quantitatively. In this paper, an excavation model of diversion tunnel is established in ANSYS to analyze the deformation of surrounding rock, the instability probability of tunnel is obtained by Monte-Carlo method. Combined with BIM technology, the construction information model of TBM tunnel including personnel distribution, team cooperation, material transportation, structure layout and other engineering information is established. Based on combining surrounding rock information and TBM engineering information, the TBM tunnel is divided into several sections according to time and space by statistical method, the collapse risk of TBM tunnel during construction is quantitatively assessed by zoning to realize the visualization of risk class. The results can be used for TBM tunnel construction risk assessment, improving the efficiency of risk control.
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