盾构隧道近距离侧穿高层建筑的影响探析
发布时间：2018-08-21 20:15
【摘要】：通过建立基于承台单桩的三维有限元模型,研究了盾构隧道穿越高层建筑桩基台的变形和内应力情况,并以此为基础分析了不同土仓压力、注浆压力和刚度折减系数下盾构隧道掘进对桩基性能的影响规律。研究结果表明:桩身与掘进方向垂直方向位移基本可以忽略不计;桩身沿掘进方向时,桩身绕承台沿盾构掘进方向发生挠曲变形;当桩身沿掘进竖直方向时,隧道中心沉降达到最大;由于承台的存在使得桩顶层负摩阻力区慢慢较小,最终成为正摩阻区;土仓压力的增大能告便桩身的位移方向,注浆压力越大,桩顶稳定态的沉降值越小,桩顶承载更多承台荷载;土体卸荷扰动减小,桩身挠曲变形减小,达到稳定状态时随对应的桩顶沉降也就越小。
[Abstract]:By establishing a three-dimensional finite element model based on single pile of cap, the deformation and internal stress of pile base of shield tunneling through high-rise building are studied, and the pressure of different soil silo is analyzed based on the model. The influence of shield tunneling on pile foundation performance under grouting pressure and stiffness reduction coefficient. The results show that the vertical displacement of the pile body and the heading direction can be ignored basically; when the pile body is along the heading direction, the deflection of the pile body around the cap along the direction of shield tunneling occurs; when the pile body is along the vertical direction of the excavation, Due to the existence of cap, the negative friction zone on top of pile becomes smaller, and finally becomes positive friction zone. The increase of pressure in earth bunker can inform the displacement direction of pile body, the greater the grouting pressure, the greater the grouting pressure. The smaller the settlement value of the pile top is, the more the pile top loads are, and the smaller the unloading disturbance is and the flexural deformation of the pile body is reduced, the smaller the settlement of the pile top is when it reaches the stable state.
【作者单位】： 陕西职业技术学院;华北理工大学;
【分类号】：U455.43
本文编号：2196232
[Abstract]:By establishing a three-dimensional finite element model based on single pile of cap, the deformation and internal stress of pile base of shield tunneling through high-rise building are studied, and the pressure of different soil silo is analyzed based on the model. The influence of shield tunneling on pile foundation performance under grouting pressure and stiffness reduction coefficient. The results show that the vertical displacement of the pile body and the heading direction can be ignored basically; when the pile body is along the heading direction, the deflection of the pile body around the cap along the direction of shield tunneling occurs; when the pile body is along the vertical direction of the excavation, Due to the existence of cap, the negative friction zone on top of pile becomes smaller, and finally becomes positive friction zone. The increase of pressure in earth bunker can inform the displacement direction of pile body, the greater the grouting pressure, the greater the grouting pressure. The smaller the settlement value of the pile top is, the more the pile top loads are, and the smaller the unloading disturbance is and the flexural deformation of the pile body is reduced, the smaller the settlement of the pile top is when it reaches the stable state.
【作者单位】： 陕西职业技术学院;华北理工大学;
【分类号】：U455.43
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