洪水冲刷对重载铁路桥梁动力性能影响及加固技术

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摘要洪水冲刷可导致桥墩基础周围土体受到破坏，轻则降低基础承载能力和动力性能，重则导致桥梁垮塌事故发生，洪水冲桥墩问题直接影响铁路运营安全，冲刷是引起桥梁墩台失稳破坏的主要因素之一。以某重载铁路为工程背景，针对洪水冲刷作用下的浅埋式桩基础桥梁，开展冲刷对桥梁的动力性能影响规律和加固技术研究。结果表明：洪水冲刷引起桩基础出现不同程度外露，进而导致桥墩及主梁动力响应增大，随冲刷深度增加，桥墩墩顶横向振幅和桥跨跨中横向振幅等参数逐渐增大，而桥墩自振频率逐渐降低；桥墩振动增大直接导致主梁振动加剧，墩顶横向振幅及梁跨跨中横向振幅等多项动力性能参数与基础冲刷深度和列车速度均成正比；针对冲刷病害，提出了基于提高基础稳定性和整体加固目标的“增补桩基法+增大基础法”并完成实际工程应用，在加固前后进行动力性能试验，加固后桥墩及主梁横向振动明显降低，加固效果显著。

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关键词 ：洪水冲刷, 重载铁路, 冲刷深度, 动力性能, 加固技术

Abstract：Flood scouring can lead to the destruction of the soil around pier foundation, and reduce the carrying capacity and dynamic performances, in serious cases, resulting in the collapse of bridges.The flood scouring on piers directly affects the safety of the railway operation, and is one of the main factors that cause damage to the bridge piers.Taking a heavy load railway as the engineering background, aiming at the shallow foundation pile bridge under the flood scouring, dynamic performance test and reinforcement technology research were carried out.The results show that flood scouring would bring the pile foundation to different degrees of exposure, which leads to the increase of the bridge and main beam dynamic responses.With the increase of the depth of scouring, the lateral vibration amplitudes of the pier and bridge gradually increase, and the lateral vibration frequency of the pier gradually decreases.The vibration of the pier directly intensifies the bridge vibration, with the dynamic performance parameters proportional to the basic scouring depth and the train speed.Against the scouring disaster, a method named “pile foundation supplement + base enlargement” method was put for ward for the sake of improving the base stability and the overall reinforcement.Dynamic performance tests were carried out before and after the reinforcement, the transverse vibration amplitudes of the pier and bridge are obviously reduced and the reinforcement effect is remarkable.

Key words： flood scouring heavy-haul railway scouring depth dynamic response reinforcement technology

收稿日期: 2017-10-27 出版日期: 2018-11-15

引用本文:

陈树礼 1，2，刘永前 1,2. 洪水冲刷对重载铁路桥梁动力性能影响及加固技术[J]. 振动与冲击, 2018, 37(22): 187-193.
CHEN Shuli1,2,LIU Yongqian1,2. Influence research of flood scouring on heavy-haul railway bridge dynamic performances and the corresponding reinforcement technology. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(22): 187-193.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2018/V37/I22/187

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