Abstract Compared with straight pipe-roof jacking construction, curved pipe-roof jacking is more difficult with respect to accuracy control, interaction between pipes and pipe-roof formation. Using the curved pipe-roof jacking of the Gongbei tunnel of the Hong Kong-Zhuhai-Macao Bridge as an example, the interaction between the pipes of a curved pipe-roof is studied using a model test, a numerical simulation and an in-situ test, and the laws and characteristics of the effects of pipe-jacking on the cumulative disturbance of the soil, soil strain, contact pressure between the pipe and soil and the jacking path are analyzed. The results show that: 1) in the process of pipe jacking, the ground surface uplifts and the transverse and longitudinal soil strain increases in front of the jacking machine; 2) the variation laws of soil displacement and strain obtained by the model test are almost consistent with the numerical simulation results; and 3) with the help of effective jacking parameter controls and appropriate construction measures, the interaction between the pipes of a curved pipe-roof can be effectively reduced and controlled by timely measuring and correcting the jacking deviation to ensure successful formation of the pipe-roof.
Abstract：
Compared with straight pipe-roof jacking construction, curved pipe-roof jacking is more difficult with respect to accuracy control, interaction between pipes and pipe-roof formation. Using the curved pipe-roof jacking of the Gongbei tunnel of the Hong Kong-Zhuhai-Macao Bridge as an example, the interaction between the pipes of a curved pipe-roof is studied using a model test, a numerical simulation and an in-situ test, and the laws and characteristics of the effects of pipe-jacking on the cumulative disturbance of the soil, soil strain, contact pressure between the pipe and soil and the jacking path are analyzed. The results show that: 1) in the process of pipe jacking, the ground surface uplifts and the transverse and longitudinal soil strain increases in front of the jacking machine; 2) the variation laws of soil displacement and strain obtained by the model test are almost consistent with the numerical simulation results; and 3) with the help of effective jacking parameter controls and appropriate construction measures, the interaction between the pipes of a curved pipe-roof can be effectively reduced and controlled by timely measuring and correcting the jacking deviation to ensure successful formation of the pipe-roof.
2015, Vol. 52 