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高等级公路(包括高速公路)在使用后不久,普遍存在一个问题:路面在台背回填处出现不同程度的沉降断裂(沉降值一般为10～30cm,有的甚至超过60cm),使车辆通过时产生跳跃和冲击,从而对桥涵和路面造成附加的冲击荷载,使司机和乘客感到颠簸不适,甚至造成车辆大幅度减速,严重的可导致交通事故(特别是车辆机械事故)。因此,桥头跳车问题已成为高等级公路的工程质量和造价的重要影响因素。桥头跳车问题一直是困扰市政管理工程技术人员的难题之一。解决桥头跳车的问题,是市政设施管理部门的重要任务。
Shortly after the use of high-grade highways (including expressways), there is a common problem that the road surface will have subsidence faults of varying degrees at the backfill (the settlement value is generally 10 to 30 cm and some even exceeds 60 cm) Resulting in jumping and impact, resulting in additional impact loads on the bridges and culverts and roads, causing bumps and discomfort to drivers and passengers, and even causing substantial deceleration of vehicles, which in turn can lead to serious traffic accidents (especially vehicle mechanical accidents). Therefore, the problem of bridgehead jumping has become an important factor affecting the construction quality and cost of high-grade highways. Bridgehead jumping has always plagued municipal management engineers and technicians. The solution to the problem of jumping at the bridgehead is an important task of the municipal facilities management department.