Abstract: In order to study the mechanism of asymmetric floor heave of tunnel under tunnel bedding effect. The non-uniformity of floor heave and the distribution of surrounding rock stress and pore water pressure under five different strata angles of 0°, 30°, 45°, 60°and 90° are studied through numerical analysis of FLAC^3D. The results show that the distribution of floor heave is controlled by the strata angles, when the rock slope is less than 45°, the bigger the inclination angle is, the stronger the no-uniformity of floor heave is. When the rock slope is more than 45°, the non-uniformity of the tunnel floor heave is gradually weakened. The maximum vertical displacement of the tunnel is related to the strata angle. If the angle is less than 60°, the angle between normal and vertical directions of the maximum displacement is approximately equal to the angle of strata. If the angle is larger than or equal to 60°, the direction of the maximum displacement is controlled by the dip angle, which is approximately the same as the dip angle. The distribution of stress and pore water pressure in tunnel surrounding rock increases with the increase of the dip angle of rock strata, and the asymmetry is enhanced.