The forepoling bolts are used for major anti-sliding measure in soil nailing retaining and protection of foundation excavation. In the forthcoming design of soil-nailing retaining wall with forepoling bolts

the whole stability is only checked or they are used for safe reserve. This paper applies the theory of earth pressure acting on piles in a row

which had already been derived by Ito and Matsui

to analyze forepoling bolts. The anti-sliding action that the forepoling bolts take in the soil nailing retaining wall is studied. The stability analyzing method for the soil-nailing wall with the forepoling bolts is expounded; and it has been verified by an engineering example. By studying the soil-nailing wall with the forepoling bolts

its design theory will be greatly improved. Meanwhile

engineering cost will be decreased.