平顶隧道下穿地下建筑物的影响研究

Analysis of flat-topped tunnel excavation's impacts on underground buildings

文章以青岛某段新建平顶隧道开挖为例,采用三维有限元方法对此段隧道的五导洞开挖方式进行数值模拟。新建隧道开挖过程中,地铁车站附属结构、地铁车站和地下商厦的附加内力和沉降会发生变化,甚至可能导致地下建筑物倾斜或倒塌,此外,地下建筑的自重和刚度也影响了地表土体的移动。鉴于此段新建隧道下穿地下建筑较为复杂,施工难度大,文章考虑整体因素,对隧道、地下建筑和地表之间的共同作用进行分析,为设计与施工提出合理建议,也为类似工程施工提供参考。

A new flat-topped tunnel excavation in Qingdao is taken as an example and the three-dimen- sional finite element method is adopted to implement numerical simulation of the five-heading excava- ting method of this tunnel. During the excavation process of the new tunnel, the additional internal force and sedimentation of the subway station, its adjacent structure and the underground mall will change, and the underground buildings may even incline and collapse in some serious cases. Besides, the self-weight and stiffness of underground buildings also influence the movements of surface soil. Because constructing a tunnel passing down underground buildings is relatively complicated and diffi- cult, the overall factors are taken into consideration, and the coaction among the tunnel, the under- ground buildings and the earth surface is analyzed. Reasonable suggestions are given for both the de- sign and construction. This study provides a reference for simiiar project construction.