Abstract: Mountainadjacent tunnel is one of the asymmetrically loaded tunnel and its potential are very predominant. The characters of asymmetrically loaded tunnel were analyzed by FEM through specific project. At the same time the stress and deformation were formulated. With regard to the stress characteristic, the stress of the cave wall which faces the river is a little higher than the stress of inside wall, the maximum stress of the outside wall reaches 1.36 MPa while the inboard wall is only 1.13 MPa, the asymmetrically loaded parts mainly centre in the cave bottom and the spandrel, namely the distribution of the stress is asymmetrical between inside and outside spandrel, and the deformation pressure of outside spandrel increases. The displacement characteristic show that the cave bottom as curve fulcrum and displacement takes on a flat shape curve which offsets to the empty direction. The maximum horizontal displacement offset is about 7.4cm and the vertical is only about 4.1 cm. Distribution of the wall displacement is unsymmetrical and there is no character in consistent with displacement curve of cave bottom. The analysis result has offered the theoretical foundation for engineering design.

Key words: asymmetrically loaded tunnel, FEM, stress, displacement