Abstract:

In this paper, the monitoring data of surface deformation during the construction of pipe jacking tunnel constructed by cut and convert (CC) method are summarized and analyzed; the linear regression analysis method is used to fit the data; the surface deformation law is summarized; the soil disturbance in the upper part of the tunnel is divided into 3 categories; and it is found that the surface deformation during tunneling shows a trend of settlement after uplift. And then the superposition zone of surface deformation affected by the tunnel and the preceding tunnel is proposed, of which the range and shape are described; and the influence degree of the tunnel construction on the surface deformation of the preceding tunnel is analyzed. Finally, the Peck settlement prediction formula is modified; the surface loss correction coefficient and the settlement groove width correction coefficient are introduced; and the applicability of the correction coefficient is verified. Meanwhile, the main factors affecting the surface deformation of the pipe jacking tunnel constructed by CC method are summarized, and the corresponding countermeasures are put forward.

Key words: cut and convert method,  , rectangular pipe jacking,  ,  zero spacing construction,  surface deformation,  modified Peck formula,  settlement control