【摘要】：通過建立基于承臺(tái)單樁的三維有限元模型,研究了盾構(gòu)隧道穿越高層建筑樁基臺(tái)的變形和內(nèi)應(yīng)力情況,并以此為基礎(chǔ)分析了不同土倉壓力、注漿壓力和剛度折減系數(shù)下盾構(gòu)隧道掘進(jìn)對(duì)樁基性能的影響規(guī)律。研究結(jié)果表明:樁身與掘進(jìn)方向垂直方向位移基本可以忽略不計(jì);樁身沿掘進(jìn)方向時(shí),樁身繞承臺(tái)沿盾構(gòu)掘進(jìn)方向發(fā)生撓曲變形;當(dāng)樁身沿掘進(jìn)豎直方向時(shí),隧道中心沉降達(dá)到最大;由于承臺(tái)的存在使得樁頂層負(fù)摩阻力區(qū)慢慢較小,最終成為正摩阻區(qū);土倉壓力的增大能告便樁身的位移方向,注漿壓力越大,樁頂穩(wěn)定態(tài)的沉降值越小,樁頂承載更多承臺(tái)荷載;土體卸荷擾動(dòng)減小,樁身撓曲變形減小,達(dá)到穩(wěn)定狀態(tài)時(shí)隨對(duì)應(yīng)的樁頂沉降也就越小。
[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.
【作者單位】： 陜西職業(yè)技術(shù)學(xué)院;華北理工大學(xué);
【分類號(hào)】：U455.43

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