Optimum Analysis of Soil-nailing Protecting Stability in Foundation Pit

The concept of disturbing force proposed by Sarma is adopted,the limit equilibrium state of soil-nailing wall is analysed. The mathematical model of stability analysis which the interaction of inter-slice force is considered is established for the soil-nailing wall. The most dangerous sliding plane is determined based on the SLP optimization theory. The calculations of the project examples show its advantages and practicality.