盾构隧道施工对临近桥桩影响数值及现场监测研究

Numerical analysis and field monitoring for studying effects of shield tunnelling on nearby piles

随着城市内地铁盾构区间隧道临近城市道路桥桩工程的增多,急需研究盾构隧道临近桥桩施工对桥桩的变形影响问题。采用有限元数值计算方法,结合盾构隧道穿越桥桩实际工程,建立了盾构隧道施工对临近桥桩影响的数值分析模型,模拟盾构隧道施工,对盾构隧道穿越临近桥桩的桩体沉降、桩体侧移、地表沉降进行了数值分析研究,盾构隧道穿越时及穿越后桩体沉降、桩体侧移、地表沉降控制结果较为理想,桩体处于稳定状态。结合现场监测成果,对数值计算结果和监测结果进行对比分析,表明采用的数值分析计算模型、参数取值对盾构隧道施工对临近桥桩影响的模拟是可靠的,可以运用文中的数值计算方法预测后续盾构隧道施工引起临近桥桩沉降、桩体侧移和地表沉降结果。

There are more shield tunnellings near the pile of the bridge in the downtown, the problem of the effects of shield tunnelling on the nearby piles of the bridge need to be studied. The numerical analysis method is used to study this problem. And than a numerical analysis model is established. The settlement of the pile, the lateral displacement of the pile and the settlement of the ground induced by the shield tunneling are analyzed. The settlement of the pile, the lateral displacement of the pile, the settlement of the ground during the shield tunnelling and after the tunnel crossing the pile is in controllable. The results of the numerical analysis and the results of monitoring are compared; and the results are similar to each other, so as to show the reliable of using the numerical analysis method to study the effects of the shield tunnelling on the nearby piles.