The soil-nailing protecting structure is designed by limiting condition generally; and in all

to check its stability is important in design. According to the structure characteristics

analyzing the breakage pattern of soil-nailing protecting structure

making use of the limit broke theories of the slope and the limit analysis method of the structure body

this paper studied that the revolving and gliding breakage of the soil-nailing protecting structure occurred possibly. Depending on this

the stability of the soil-nailing protecting structure was analyzed. The research results show that the soil-nailing structure was broken possibly itself in the weak foundation. The steel pipe shot buries soil-nailing was properly adopted in order to strengthen its bending resistance in engineering design.