Abstract: Pile foundation construction may have passive effects on the adjacent tunnel; and it makes the settlement and horizontal displacement of the tunnel increase slowly and makes the surrounding soil disturbance. The field measurements are carried out. The results show that the settlements and horizontal displacements of tunnel increase slowly; the pile surrounding soils are disturbed. The correspondent cross section has the maximum segment displacement. The settlement and horizontal displacement of the segments decrease with distance between the piles and the tunnel. The settlements are probably 0.5 times of horizontal displacement-based segments. Soil horizontal displacement moves to direction of the tunnel in one burial depth of the tunnel, while moves to the other direction beyond the burial depth. The test of pile practice shows that it is possible that soils can be cutting by all the steel casing pipe wall spiral; and it has better early warning and controlling construction risk for information monitoring of tunnel and surrounding soil layers during construction. The conclusions can provide the guidance of similar projects and for references.

Key words: adjacent pile foundation, monitoring, shield construction, segment