Study on the soundness evaluation of embankment using non destructive inspection, model test and numerical analysis.

从表面波传播试验和模型试验结果可以看出，渗流水对路堤长期稳定的影响较大。长期渗水冲刷出细粒土，形成水道。因此，即使路基表面不发生变形和沉降，其抗震稳定性也会下降。把握路堤内部状态的变化具有重要意义。提出了维护系统。在该系统中，除了目测外，还采用表面传播试验对路基的内部状态进行了把握。通过该系统的管理，便于制定对策的优先级和长期维护的规划。

From the results of surface wave propagation test and model tests, it is clear that seepage water has large influence on long-term stability of embankment. Moreover, fine particle soil washed out and water path is formed by long-term seepage water. Therefore, even if deformation and settlement are not observed on the surface of embankment, earthquake resistance and stability may decrease. It is important to grasp the change of internal state of embankment.The system of maintenance is proposed. In this system, the stability of embankment is evaluated by the grasp of internal state using surface propagation test in addition to visual inspection. By the management with such this system, the development of the priority of countermeasure and planning of long-term maintenance become easy.