摘要
研究目的:隧道施工对邻近建筑物影响的现有研究方法通常首先计算地表位移,然后将地表位移施加于建筑物模型上,忽略了建筑物自重和刚度的影响。建立隧道从框架结构正下方穿越的三维有限元模型,分析地表在隧道开挖和既有框架结构共同作用下的位移变化规律,分析隧道施工对梁、柱和桩体位移及受力的影响,为隧道下穿既有框架建筑物的设计和施工提供参考意见。研究结论:框架结构的自重会显著增大地表沉降值及其范围,其刚度会显著限制地表侧向位移;隧道施工对框架结构的竖向位移影响较大,对其侧向变形影响较小;中梁弯矩变化较小,边梁的的最大负弯矩有较大幅度的增加。中柱的轴向压力降低,边柱的轴向压力增加。在实际工程中,应加强对边梁弯矩和边柱轴力的监控。
Research purposes： Current practice for assessment of effects on adjacent structures due to tunneling usually starts with a procedure in which ground movement is imposed on a structural model of the building. The process ignores the effects of the building＇s weight and stiffness. Numerical modeling of damage to structure due to tunneling is established. The combined effect of tunneling and structures on ground movement is analyzed, and the deformation and endogenous force of frame structure and piles influenced by tunneling are studied. Some reference opinions are provided for the work of design and construction. Research conclusions：The results show that the settlement and its area of the ground increase significantly due to the weight of structure, but the lateral movement of the ground reduces significantly due to the stiffness of structure ; Vertical displacement of the structure is significantly influenced by tunneling, but the lateral deformation is not marked. The bending moment of middle beams change little, but the bending moment of side beams increase marked. The axial force of middle pillars decreases, but the axial force of side pillars increases. In practice, the side beams and side pillars should be measured.
出处
《铁道工程学报》
EI
北大核心
2008年第9期58-61,共4页
Journal of Railway Engineering Society
关键词
隧道
地表位移
框架结构
数值分析
tunnel
ground movement
frame structure
numerical analysis
作者简介
李浩，1965年出生，男，高级工程师。
