A study on the method of stability calculation of soil nailing expansive soil slope

Abstract

In order to analyze the stability and optimize the project of soil nailing engineering for expansive soil slope, the calculation formulas for unsaturated soils strength, soil nailing surface bond strength, and nail withdraw strength was deduced based on the Mohr-Coulomb strength formula and national regulations. The sliding resistance of the soil nailing was taken into consideration based upon the Bishop slice method; Calculating models on soil nailing expansive soil slope stability analysis was designed; The influence of fissure, rain infiltration, and soil nailing on the expansive soil slope stability were also taken into account. Based on engineering example, fixed slope soil parameter and according soil nailing parameter, the influential factors were analyzed by changing soil nails inclination, installation position, and length. As it was demonstrated by engineering example, the methods and corresponding calculating procedure were reasonable for stability analysis and design optimization for soil nailing expansive soil slope. It is of certain engineering application value.