| Soil-nail is developed in recent decades as a kind of new soil-retained technology, and there are some problems to be solved though it is widely applied now. In this paper , some structural design methods of soil-nail are introduced, at the same time appraisals about them are given and then some unsolved problems in the structural design are discovered , what is more , a method , namely ultimate-equilibrium analysis method of multi-wedge body in soil-nail bracing, is proposed to solve the problem on the selection of destructive mode, moreover, its optimal design is discussedo...
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