盾构隧道侧穿既有桥梁工程技术研究

Study on engineering technology of shield tunneling through existing bridges

盾构隧道侧穿既有桥梁施工过程中,隧道开挖扰动四周岩体引发地层变化,对相近的桥桩及地表产生影响。以呼和浩特2号线某标段工程为例,对盾构隧道侧穿既有桥梁引起的工程风险进行研究,通过Midas-GTS NX有限元软件进行数值模拟,结果表明:通过注浆加固等控制措施能有效保证桥梁变形在合理范围内。

During the construction of shield tunnel side through the existing bridge,the tunnel excavation will disturb the surrounding rock mass and causes stratum change,which will affect the adjacent bridge piles and the surface. In this paper,the engineering risk caused by shield tunnel through the existing bridge is studied by taking a section of line 2 in Hohhot as an example. In this paper,the finite element software Midas-GTS NX is used for numerical simulation,and the results show that the control measures such as grouting reinforcement can effectively ensure the deformation of the bridge in a reasonable range.