地裂缝对高速铁路桥梁的破坏机理研究

发布时间：2018-06-27 07:57

本文选题：地裂缝 + 高速铁路　；参考：《铁道建筑》2014年06期

【摘要】：在实验室内,采用几何比尺1∶20的物理模型试验模拟分析高速铁路桥梁45°穿越地裂缝带时,地裂缝不同活动量对桥墩桩端应力、桥上轨道变形、稳定性等的影响。研究结果表明:随地裂缝上盘沉降量的增加,桩端压力主要表现为上盘减小,下盘靠近地裂缝处桩端压力明显增大;当地裂缝垂直位错量达到2 cm时地表出现开裂;当地裂缝垂直位错量达到3 cm时轨道道床板靠近地裂缝处开始出现裂缝;当沉降量达到4 cm时地裂缝贯穿道床板;地裂缝活动对跨过地裂缝的箱梁、道床板和轨道影响较大,而对未跨过的影响不大。本文研究结果可为高速铁路工程中地裂缝灾害的防治和预警提供参考。
[Abstract]:In the laboratory, the physical model test of 1:20 geometric scale is used to simulate and analyze the effects of different activities of ground fissures on pile end stress, deformation and stability of bridge piers when high-speed railway bridge crosses the ground fissure at 45 掳. The results show that with the increase of settlement, the pile end pressure decreases, the pile end pressure increases obviously near the ground fissure, and the surface cracks occur when the vertical dislocations of the local cracks reach 2 cm. When the vertical dislocations of local cracks reach 3 cm, cracks begin to appear on the track bed near the ground fissures, and when the settlement reaches 4 cm, the ground fissures run through the bed, and the ground fissures have a great influence on the box girders crossing the ground cracks, the track bed and the track. But it has little effect on the uncrossed. The results of this paper can provide a reference for the prevention and early warning of ground fissures in high speed railway engineering.
【作者单位】：大西铁路客运专线有限责任公司;铁道第三勘察设计院集团有限公司;长安大学;
【分类号】：U445.7

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