| Abstrakt: |
To comprehensively investigate the stress distribution patterns of tunnels in cold zone under the joint action of freeze-thaw cycle and non-hydrostatic pressure, an overall frost heave model of freeze-thaw cycle of tunnels in cold zone under non-hydrostatic pressure is established based on compound function considering the inhomogeneous frost-heave characteristics of the frozen surrounding rocks of the tunnels in cold zone and the influence of freeze-thaw cycle on the mechanical properties of the surrounding rocks. Then the elastic solution of the stress of the tunnels in cold zone under the action of non-hydrostatic pressure is deduced, and a comparative validation and parametric analysis are conducted on the obtained solution. Finally, the influence of the number of freeze-thaw cycles, inhomogeneous frost-heave coefficient, lateral pressure coefficient, freezing and expansion rate on the stress of tunnels in the cold zone is discussed. The results reveal the following: (1) The frost-heave force increases by 89% and 26.7% with increasing number of freeze-thaw cycles and inhomogeneous frost-heave coefficient, respectively. (2) The lateral pressure coefficient λ has a considerable impact on the frost-heave force, the frost-heave force increases and decreases with increasing azimuthal angle when λ≥1 and λ<1, respectively. (3) The hydrothermal migration coefficient considerably affects the frost-heave force rather than other three volumetric freezing and expansion rate parameters, which can increase the frost-heave force by 36.4%. [ABSTRACT FROM AUTHOR] |
