Stability Of Expansive Soil Slope

The influence of swelling deformation on the stability of expansive soil slope was discussed in this paper. And a limit equilibrium method for calculating slope stability was proposed while considering swelling deformation of expansive soil using the equivalent deformation force. The horizontal deformation force coefficient of expansive soil which was obtained from model test was substituted into Fellini's formula to calculate the safety factor of slope. Taking a high expansive slope in constructing Yun-Gui high-speed railway, safety factor of slope considering horizontal deformation force is reduced by 10.5%. The results show that the limit equilibrium method for slope stability considering horizontal deformation is reasonable and practicable. It is a safe design for supporting structures to determine the safety factor by considering the influence of deformation force.