The interaction between soil nailing and soil is considered and a true three-dimensional finite element model has been developed to analyze the strain-stress and the deformation performances of soil nailings. The optimum design method with deformation control and stress control of soil-nail retaining structure is presented. Using genetic algorithms and complex method
the mathematical model of structural optimal design is established regarding the stress and the deformation as constraint conditions and regarding the project cost as objective function; and the calculation program is compiled correspondingly. Taking a case study and comparing with the result of specification method and the optimal results based on specification method