盾构隧道近距离斜侧穿建筑物群桩基础施工参数影响研究

Study on the Influence of Construction Parameters of Shield Tunnels Obliquely Sideways Through the Pile Foundation of Buildings at Close Range

为了研究盾构隧道近距离斜侧穿建筑物群桩基础时不同施工参数对桩体的影响,以济南轨道交通1号线盾构隧道近距离斜侧穿济南西站东广场建筑物管桩为工程背景,通过数值模拟建立盾构隧道斜侧穿建筑物管桩基础计算模型,分析盾构掘进施工过程中不同施工参数对桩体的位移和内力影响。主要结论为,盾构隧道斜穿建筑物桩基时,注浆量的提高能减小桩体横向位移而增大桩体纵向位移;注浆压力的提高能减小桩体的横向位移而增大桩体的纵向位移;注浆量的增加对桩身轴力无显著影响而会增大桩身弯矩;注浆压力增大,桩身轴力与弯矩随之增大。

In order to study the influence of different construction parameters on the pile foundation when the shield tunnel crosses the pile foundation of the building group obliquely at a short distance, this paper takes Jinan Rail Transit line 1 shield tunnel obliquely crossing the building pipe pile of the east square of Jinan West Railway Station as engineering background. The calculation model of the shield tunnel obliquely crossing the pipe pile foundation of the building is established through numerical simulation, and the influence of different construction parameters on the displacement and internal force of the pile body during the construction of the shield tunnel is analyzed. The main conclusions are as follows: When the shield tunnel crosses the building piles obliquely, the increase of the grouting amount can reduce the lateral displacement of the pile and increase the longitudinal displacement of the pile;The increase of the grouting pressure can reduce the lateral displacement of the pile, and increases the longitudinal displacement of the pile body;The increase of the grouting amount has no significant effect on the axial force of the pile body and will increase the bending moment of the pile body;When the grouting pressure increases, the axial force and bending moment of the pile body increase accordingly.