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桥头与路基产生相对沉降量的主要原因在于他们本身结构不同．桥体本身是一种刚性体．而路基是由路面与土基的组合。因此．为防止桥头跳车的产生．文中介绍了采用土基某一深度层产生沉降的理论公式及动力荷载对路基作用下的理论来计算沉降量。
The main reason for the relative settlement of bridgehead and subgrade lies in their different structures. Bridge itself is a rigid body. The roadbed is composed of a combination of pavement and soil. therefore. To prevent the occurrence of bridge jumping. In this paper, the theoretical formula of settlement in a deep layer of soil foundation and the theory of dynamic load on subgrade are introduced to calculate the settlement.