岩石地基中群桩基础对相邻车站隧道影响分析——以重庆地铁1号线七星岗站为例

发布时间：2018-12-20 07:46

【摘要】：桩基加载会造成周围土体的位移和应力变化,继而对邻近隧道的内力和位移造成影响,特别是在群桩基础的作用下,这种影响不可忽视。以岩质地基中大跨径车站隧道与群桩基础的相互影响为研究对象,采用有限元软件对群桩位于隧道顶板上方、隧道侧壁破裂面以下及隧道底板3种模型进行对比分析,重点比较桩基加载工况下隧道位移变化及衬砌内力变化。分析表明当桩基础荷载大,隧道洞跨大时,置于隧道顶板的桩基础会明显降低衬砌安全系数,使衬砌结构遭受破坏;通过数值模拟对比分析得出当桩基位于隧道侧墙破裂面以下,且临近隧道侧墙的桩基加长至隧道拱底标高时,能大大降低对隧道衬砌结构和位移的影响,并能确保运营隧道的结构安全。
[Abstract]:The load of pile foundation will cause the displacement and stress change of surrounding soil, and then affect the internal force and displacement of adjacent tunnel, especially under the action of pile group foundation, this kind of influence can not be ignored. Taking the interaction between the medium and long span railway station tunnel and pile group foundation as the research object, three kinds of models of pile group are compared and analyzed by finite element software, which are above the top of the tunnel, below the rupture surface of the side wall of the tunnel and the bottom of the tunnel. The variation of tunnel displacement and lining internal force under the loading condition of pile foundation is emphatically compared. The analysis shows that when the pile foundation is loaded and the tunnel span is large, the pile foundation placed on the top of the tunnel will obviously reduce the safety factor of the lining and cause the lining structure to be destroyed. Through numerical simulation and contrast analysis, it is concluded that when the pile foundation is located below the rupture surface of the tunnel side wall and the pile foundation near the tunnel side wall is lengthened to the elevation of the arch bottom of the tunnel, the influence on the tunnel lining structure and displacement can be greatly reduced. And can ensure the structure of the tunnel operation safety.
【作者单位】：中煤科工集团重庆设计研究院有限公司;
【分类号】：U451;U231.1

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