双线盾构扭矩分析及邻近管线变形影响研究

Research purposes: Based on a shield section project of Hangzhou Metro Line 2, the transverse and longitudinal deformation law of pipeline caused by the construction of double shield tunnel is studied. The calculation method of cutter head in shield tunneling in soft soil area of Hangzhou is adopted to calculate various cutter head torque factors corresponding to this project and obtain the maximum theoretical torque value. The obtained cutter head torque factor which will be calculated is compared with other scholars' research results, and the correlation between pipeline deformation and cutter head torque during shield tunneling is studied. Research conclusions:(1)The lateral deformation of pipeline caused by double shield tunneling in soft soil area presents a "W double-peak" shape on the research section, and the deformation caused by the construction of the backward line is greater than that of the leading line. (2)For the longitudinal deformation of pipeline caused by the construction of double shield, it is measured that the pipeline deformation is greatly affected when the shield is close to and just passes through, and the longitudinal deformation of shield tail tends to be stable through the study of section 4 d or so. (3)By comparing the torque calculation factors of cutter head in different cases, it is concluded that the main factors affecting the torque of cutter head in shield construction are T₄ and T₅. (4)The results show that the ratio of pipeline deformation to the torque of cutter head and the amount of soil discharged by a single ring is positively correlated. (5)The research result has reference value for controlling pipeline deformation caused by double shield construction in Hangzhou soft soil area.