桥头跳车处理技术研究

桥头跳车常导致公路交通运输功能无法得到满足，诱发、加重桥梁病害、缩短交通工具使用寿命，并影响交通安全。长期以来高等级公路桥头跳车问题已成为国际公认的公路交通技术难题。一方面桥台地基和基础形式与高填方路基形式不同，导致桥头紧邻两部分的荷载和承载方式不同，易于产生不均匀沉降变形；另一方面桥台部分与高填方路基的基层结构形式不同，在行车荷载作用下，桥头高填方路基基层整体性较差，交通荷载下易产生沉降变形，而桥台部分整体性好，使桥台产生的沉降变形显著减小。本文从减小桥头高填方路基的绝对沉降变形和桥台和填方区路基相对沉降差两方面入手，探讨了高速公路桥头跳车的处理技术，对目前我国高等级公路建设过程中的桥头跳车问题的缓解具有一定的工程参考价值。

Study on treating techniques of Vehicle Bump Approaching Bridge

Freeway traffic transport function can't be satisfied because of Vehicle Bump Approaching Bridge, which not only induces and aggravates bridge diseases, but also shortens vehicle service life and impacts traffic safety. For a long time, Vehicle Bump Approaching Bridge is regarded as an international engineering roadblock in freeway traffic. On one hand, the form of abutment foundation is different from that of high-filled subgrade,which results in differential settlement; On the other hand, structural styles of abutment and thick filled subgrade are different,under the load of vehicle,the deformation of abutment is much less than that of thick filled subgrade. Processing techniques of Vehicle Bump Approaching Bridge on freeway are discussed in detail in this article by the means of reducing both absolute settlement of thick filled subgrade and relative settlement between abutment and thick filled subgrade,which may be used as a practical reference for the similar projects.