Chang’an University,

Abstract—Gongbei Tunnel project at the Zhuhai link of Hong Kong-Zhuhai-Macau Bridge is to be constructed by a new construction method – ―Freeze-Sealing Pipe Roof‖ (FSPR), serving as a forepoling system, combining with mining method. The primary purpose of this paper is to analyze the problem of frost heave in FSPR construction. The analyses of the influence of frost heave on the deformation of ground surface and the displacement of the pipes is conducted using numerical simulation. The results demonstrate that: (1) Within the actual buried depth of the tunnel, the buried depth has little impact on the deformation of pipe-roof and ground surface caused by frost heave; (2) Both the amount and the range of the deformation of ground is positively correlated to the thickness of the frozen-wall; (3) The uneven settlement of ground surface caused by frost heave is more obvious within 50m away from the tunnel axis and therefore the gradient of surface elevation beyond 50m is relatively slight; (4) The influence of the deformation of pipe-roof should be taken into consideration during the design of supporting structures as the deformation of pipe-roof caused by frost heave is closely related to the thickness of frozen-wall