Numerical Analysis Of Engineered Loess Slope With Soil Nailing

By using of numerical simulation, this paper presents a case study of artifitial loess slope locating at the exit of Lujiaya tunnel. The vertical and horizontal displacement of slope and the axial force of nails were analyzed under the three different operating conditions, i.e., slope without supporting, slope with isometric soil nailing supporting and slope with non-isometric soil nailing supporting.The results of numerical simulation showed that:(1) In the process of excavation, shear stress concentrated at the toe of the slope and increased continuously with the excavation. The concentration of shear stress in slope without supporting was most obvious among three models. (2) The displacement and settlement of the slope increased linearly with the increase of excavation depth. And the displacement of the slope without supporting was the maximum, and that of the slope with non-isometric soil nailing supporting was the minimum. (3) The location where the maximum of the axial force of soil nail appeared shifted into the slope gradually from the surface of the slope as the increase of excavation depth. And the axial force of soil nail in the slope with isometric soil nailing supporting was slightly greater than that in the slope with non-isometric soil nailing supporting.Above all, it is indicated that soil nailing plays a very important role for slope reinforcement. The effect of non-isometric soil nailing supporting is better than that of isometric soil nailing supporting.