Abstract: Based on the analytical solution for soil nailing tension model and the field measured data of soil nailing tensile test，the influences of elastic modulus of cement grout Eg and shear deformation coefficient of soil nailing K on the mechanical properties of soil nailing are analyzed. The results show that the displacement of nail head under the maximum loading decreases as Eg increases. With the increase of Eg, the relative displacement and shear force between soil and nail, decrease in the shallow part of the nail body, and increase in its deep part, respectively. Furthermore, the variations of relative displacement and shear force between soil and nail along the nail body direction become much smaller with the increase of Eg, resulting in more homogeneous distribution of side friction resistance along the nail body. As K increases, the relative displacement between soil and nail under the maximum loading decreases and the variation of relative displacement along the nail body direction becomes much smaller, indicating the effect of grouting on soil nailing gradually becomes marginal. With the same change rate of K and Eg,the influence of K on the load-displacement curve of soil nailing is greater than that of Eg, while the influence of K on the shear force between soil and nail is lower than that of Eg.

Key words: soil nailing, grouting ;mechanical properties, load-displacement curve