CAJ | 학술논문

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。
장기가재회조성주위토체적위이화응력변화，계이대린근수도적내력화위이조성영향，특별시재군장기출적작용하，저충영향불가홀시。이암질지기중대과경차참수도여군장기출적상호영향위연구대상，채용유한원연건대군장위우수도정판상방、수도측벽파렬면이하급수도저판3충모형진행대비분석，중점비교장기가재공황하수도위이변화급츤체내력변화。분석표명당장기출하재대，수도동과대시，치우수도정판적장기출회명현강저츤체안전계수，사츤체결구조수파배；통과수치모의대비분석득출당장기위우수도측장파렬면이하，차림근수도측장적장기가장지수도공저표고시，능대대강저대수도츤체결구화위이적영향，병능학보운영수도적결구안전。
The loading of pile foundations may cause displacement and stress variation of the surrounding ground,which may further pose impact on the internal force and displacement of adjacent tunnels,especially under the action of pile group foundations.In this paper,comparison and contrast is made among 3 models,including the model with the pile group being above the tunnel roof,the model with the pile group extending below the failure surface of the tunnel sidewall and the model with the pile group extending below the tunnel floor,by means of finite element software,and the variation of the displacement of the tunnel and the variation of the internal force of the lining under the loading of the pile foundation are analyzed,with a large-span rock station of Chongqing Metro as an example.The analysis shows that:Under the condition of huge pile foundation loading and big tunnel span,the lining structure of the tunnel will be damaged when the pile foundation is located above the tunnel roof;The influence of the pile group on the tunnel lining and the displacement can be minimized when the pile foundation is extended below the failure surface of the sidewall and the pile foundation adjacent to the side wall is extended below the tunnel floor.