超大直径盾构出井吊装对工作井影响研究

以济南黄河隧道南岸接收工作井盾构机出井吊装为工程背景,借助有限元分析软件,重点分析东线隧道贯通及吊装施工对黄河隧道南岸工作井的变形及受力影响。结果表明:(1)东线隧道贯通时,地连墙最大水平位移为-1.13 mm,主体结构最大水平位移为-0.92 mm;吊装施工时,地连墙最大水平位移为-1.06 mm,主体结构最大水平位移为-0.86 mm,受吊装荷载的影响,地连墙顶部出现向坑外的位移。(2)东线隧道贯通、吊装施工时环框梁的最大弯矩值为16325 kN·m,出现在第二道环框梁中部位置;受履带吊吊装施工超载影响,主体结构最大弯矩值为3915 kN·m,出现在东墙(竖向)支座处。(3)受隧道开洞及施工超载影响,主体结构最大弯矩值为2837 kN·m,出现在北墙支座处;受结构埋深影响,环框梁最大弯矩值为9634 kN·m,出现在第三道环框梁端部位置。盾构出井吊装方案可行,施工过程对工作井影响较小,能保证工作井安全;此外,在满足吊装要求的同时,履带吊应尽量远离接收井,以减小对主体结构的影响。

Study on the Influence of Lifting Out of Super Large Diameter Shield on Working Shaft

This paper takes the shield machine hoisting of the receiving working shaft on the south bank of the Jinan Yellow River Tunnel as the engineering background,with the help of finite element analysis software,focusing on the analysis of the east line tunnel penetration and hoisting construction on the deformation and force influence of the working shaft on the south bank of the Yellow River Tunnel.The results show that:(1)when the east line tunnel is through,the maximum horizontal displacement of the ground connecting wall is-1.13 mm,and the maximum horizontal displacement of the main structure is-0.92 mm;during hoisting construction,the maximum horizontal displacement of the ground connecting wall is-1.06 mm,the maximum horizontal displacement of the main structure is-0.86 mm.Affected by the hoisting load,the top of the ground connecting wall is displaced outside the pit.(2)The maximum calculated bending moment of the ring frame beam during the tunneling and hoisting construction of the eastern route is 16325 kN·m,which appears in the middle of the second ring frame beam;affected by the overload of the crawler crane,the bending moment value of the main structure is 3915 kN·m,which appears at the support of the east wall(vertical).(3)Affected by tunnel opening and construction overload,the maximum calculated bending moment of the main structure is 2837 kN·m,which appears at the north wall support;affected by the buried depth of the structure,the maximum calculated bending moment of the ring frame beam is 9634 kN·m,which appears at the end of the third ring frame beam.The hoisting plan of shield machine out of the well is feasible,and its construction process has little impact on the working well,which can ensure the safety of the working well;in addition,while meeting the hoisting requirements,the crawler crane should be as far away from the receiving well as possible to reduce the impact on the main structure.