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采用有限单元法模拟间距为5m的两个平行顶管隧道的施工,结合实测数据分析新建顶管隧道对已建隧道的附加影响;并在此基础上计算该区域内较小间距下(3m和2m)隧道附加位移和附加内力的变化情况。研究结果表明,该区域新建隧道对间距2~5m的已建隧道的附加位移影响很小,在2mm以内。计算得出,在2~5 m间距内竖向附加位移随着间距的增大而提高,水平附加位移随着间距的增加而降低。隧道结构的最大附加轴力和最大附加弯矩均随着间距的增大而降低。在间距小于3.5m的情况下,隧道结构的轴力和负弯矩的附加值均较为明显。
The finite element method was used to simulate the construction of two parallel pipe jacking tunnels with a spacing of 5m. Based on the measured data, the additional influence of the newly built pipe jacking tunnel on the existing tunnels was analyzed. Based on this, 2m) tunnel additional displacement and additional internal force changes. The results show that the newly built tunnel in this area has little influence on the additional displacement of the built tunnels with the spacing of 2 ~ 5m within 2mm. It is calculated that the vertical additional displacement increases with the spacing between 2 ~ 5 m and the horizontal additional displacement decreases with the spacing. The maximum additional axial force and the maximum additional moment of the tunnel structure decrease with the increase of the spacing. When the distance is less than 3.5m, the added value of axial force and negative moment of the tunnel structure are obvious.