汶川地震中小鱼洞大桥的变形破坏特征与机理
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摘要
在现场调查的基础上,研究了汶川地震中小鱼洞大桥的变形破坏现象,总结了变形破坏的特点,分析了发生变形破坏的机理。小鱼洞大桥在汶川地震中表现出复杂多样的变形破坏现象,包括梁体塌落,引线段断裂、形成断坎,边坡坍塌,路面纵向拉裂,盖梁与桥台之间右行错动,伸缩缝拉开并发生左行错动和桥台搭板移位等。小鱼洞大桥变形破坏的特点主要表现为挤压与拉张现象并存、左行与右行现象并存和水平向振动与竖向振动并存。地震时小鱼洞大桥受到了复杂的力学作用,不仅有水平挤压作用,而且有竖向和水平向的振动作用以及水平剪切作用。
On the basis of site investigation,deformation and failure of Xiaoyudong Bridge caused by Wenchuan earthquake are studied,its characteristics are summarized and mechanism is analyzed.The bridge showed complicated and diversified phenomena of deformation and failure,including collapse of beams,lead section segment and fault scarp formation,slope collapse,longitudinal rupture of road surface,right-lateral dislocation between cap beam and bridge abutment,extension and left-lateral dislocation of expansion joint,abutment slab displacement and so on.The deformation is characterized by co-existing of compression with extension,right-lateral dislocation with left-lateral dislocation,and horizontal vibration with vertical vibration.During the earthquake,Xiaoyudong Bridge subjected not only to horizontal compression,but also to horizontal and vertical vibration and horizontal shearing.
On the basis of site investigation,deformation and failure of Xiaoyudong Bridge caused by Wenchuan earthquake are studied,its characteristics are summarized and mechanism is analyzed.The bridge showed complicated and diversified phenomena of deformation and failure,including collapse of beams,lead section segment and fault scarp formation,slope collapse,longitudinal rupture of road surface,right-lateral dislocation between cap beam and bridge abutment,extension and left-lateral dislocation of expansion joint,abutment slab displacement and so on.The deformation is characterized by co-existing of compression with extension,right-lateral dislocation with left-lateral dislocation,and horizontal vibration with vertical vibration.During the earthquake,Xiaoyudong Bridge subjected not only to horizontal compression,but also to horizontal and vertical vibration and horizontal shearing.
引文
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[4]陈桂华,徐锡伟,于贵华,等.2008年汶川Ms8.0地震多断裂破裂的近地表同震位移及滑移分解[J].地球物理学报,2009,52(5):1384-1394.
[5]李勇,黄润秋,周荣军,等.龙门山地震带的地质背景与汶川地震的地表破裂[J].工程地质学报,2009,17(1):3-16.
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[7]李海兵,王宗秀,付小方,等.2008年5月12日汶川地震(Ms8.0)地表破裂带的分布特征[J].中国地质,2008,35(5):803-813.
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