Stress distribution and stability analysis of buttress retaining wall under different filling thickness

Abstract

Buttressed retaining wall can effectively prevent the unstable movement of soil filling. In order to obtain the influence of soil filling on the bearing deformation law of buttressed retaining wall, this paper studies the deformation stability of buttressed retaining wall under different filling thicknesses, and discusses the influence law of the filling thickness on the displacement of the retaining wall and the distribution of internal forces of the structure. The result show that:(1) When the thickness of the filling is low, the horizontal displacement at the top of the retaining wall increases with the increase of the filling amount. The horizontal displacement at the bottom of the wall continues to increase with the increase of the filling amount, and the pressure at the bottom increases, so there is a risk of tilt.(2) The internal force change of the retaining wall is analyzed, and it is found that the lateral earth pressure and internal shear stress of the retaining wall increase with the increase of the filling height. Especially in the rib section, the shear stress reaches a peak at a certain position. In addition, the shear stress distribution is closely related to the displacement mode of the retaining wall, and the retaining wall may rotate and move, resulting in the redistribution of internal stress. The design strength and layout of the floor are very important to disperse the soil pressure and reduce the shear stress concentration.(3) The increase in the thickness of the fill causes the internal stress level of the retaining wall to rise, especially in a certain position below the ground in front of the wall, the stress reaches the maximum value. The stress at the base is relatively small due to the dispersion of the foundation. During the design, it is necessary to pay attention to the influence of the change of fill thickness on the overall mechanical properties of the retaining wall to ensure that the structure is still stable enough under the most unfavorable conditions.

Keywords

buttress retaining wall / numerical calculation / stress distribution / metamorphosis / stability