断裂带错动对地铁高架桥的影响及结构优化研究  

Study on the Influence of Fault Dislocation on Metro Viaduct and its Structural Optimization

作　　者：屈阳 黄强兵[1,2] 解庆禹 苗晨阳 李伦 孙振岳 QU Yang;HUANG Qiangbing;XIE Qingyu;MIAO Chenyang;LI Lun;SUN Zhenyue(School of Geological Engineering and Geomatics,Chang’an University,Xi’an 710054,China;Research Institution of Geotechnical and Underground Engineering,Chang’an University,Xi’an 710054,China;MCC Capital Engineering and Research Incorporation Limited,Beijing 100176,China;Beijing Urban Construction Design and Development Group Co.,Limited,Beijing 100034,China)

机构地区：[1]长安大学地质工程与测绘学院,西安710054 [2]长安大学岩土与地下工程研究所,西安710054 [3]中冶京诚工程技术有限公司,北京100176 [4]北京城建设计发展集团股份有限公司,北京100034

出　　处：《铁道标准设计》2025年第1期84-95,共12页Railway Standard Design

基　　金：国家自然科学基金项目(41772274,41072222);中央高校基本科研业务费专项基金(300102262904)。

摘　　要：城市活断层蠕滑错动对市政建设构成潜在安全威胁,不同于突发型地震灾害,断层蠕滑错动为缓变型灾害,具有可控性。为揭示蠕滑错动对地铁高架桥的影响规律,以西安地铁10号线高架桥跨渭河断裂(F1)、泾阳—渭南断裂(F3)为工程背景,基于有限元数值软件建立地层-断裂带-高架桥计算模型,分析断裂带蠕滑错动作用下不同跨度与桩长地铁箱梁高架桥的变形特征。结果表明:断裂错动作用下高架桥场地地层土体变形近似呈“V”形,且上盘影响范围大于下盘;桥梁结构与地表变形均随桩长的增大而减小,当桥梁跨度为40 m、桩长为60 m时,地表沉降、高架桥箱梁及桥墩的变形最小;桥梁结构的变形与其跨越断裂带的角度有关,小角度跨断裂带时桥梁结构变形大于正交和大角度跨越工况;当高架桥以较大角度或正交跨越断裂带时,高架桥最优跨长约40 m、邻近断裂带桥桩的最优桩长约55 m;当高架桥以较小角度跨越断裂带时,高架桥最优跨长约50 m、邻近断裂带桥桩的最优桩长约60 m;地铁高架桥跨断裂带可通过采取大角度跨越、合适的桩长与桥梁跨长以减轻活动断裂错动对桥梁的影响。The creep-slip and dislocation of urban active faults poses a potential safety threat to municipal construction.Different from abrupt earthquake disasters,the creep-slip dislocation of fault is a slowdeforming disaster with controllability.In order to reveal the influence of creep-slip dislocation on metro viaducts,this paper takes the Xi’an Metro Line 10 viaduct crossing the Weihe fault(F1)and JingyangWeinan Fault(F3)as the engineering background,a strata-fault zone-viaduct calculation model is established with finite numerical software,and the deformation characteristics of the metro box girder viaduct with different spans and pile lengths under the creep-slip dislocation of the fault are analyzed.The results show that the strata deformation in the viaduct site is approximately“V”shaped under the fault dislocation,and the influence range in the hanging wall is greater than that in the footwall of active fault.Under the creep-slip dislocation of active fault,the deformation of the bridge structure crossing active fault and the ground surface decreases with the increase of viaduct pile length,and when the span of the bridge is 40 m and the pile length is 60 m,the surface settlement and the deformation of box girder and pier of viaduct are the smallest.The deformation of the bridge structure is related to its angle across the fault zone.When crossing the fault zone at a small angle,the deformation of the bridge structure is greater than that of the orthogonal and large angle crossing conditions.When the viaduct crosses the fault zone at large angle obliquely or orthogonally,the optimal span of viaduct is about 40 m and the optimal pile length for bridge piles adjacent to the fault zone is about 55 m.When the viaduct crosses the fault zone at a smaller angle,the optimal span of viaduct is about 50 m and the optimal pile length of the bridge pile adjacent to the fault zone is about 60 m.The impact of fault dislocation of metro viaduct on the bridge can be reduced by adopting large angle intersection,appropriat

关 键 词：地铁 高架桥 断裂错动 数值模拟 变形特征 最优跨长与桩长 

分 类 号：U231[交通运输工程—道路与铁道工程] U44[建筑科学—桥梁与隧道工程]