Health monitoring of drainagefunction ofembankmentsby monitoring ground vibration ～for long and safe use～

本研究考虑将微震监测作为地面健康监测的应用，重点关注由于地面含水量等地面条件的变化而引起的地面横波速度的变化。然而，在现场测量中，来自附近工厂或其他地方的噪音是实践中的严重困难之一。然后，重点讨论了多通道表面波法中人工振动引起的大信号而非小信号在微震动中的应用。在实践中，研究小组成功地观察了码头墙内由于潮汐效应而引起的地下水位变化。

In this research, application of the microtremor monitoring as a health monitoring of a ground is considered focusing on the variation of the shear wave velocity of the ground due to the variation of the ground conditions such as water content in the ground. However, in a field measurements, noises from neighborhood factories or something was one of the sever difficulties in practice. Then, application of not a small signal in microtremor but a larger signal induced by artificial vibration in multichannel surface wave method is focused. In practice, the research team succeeded to observe the variation of ground water level in a quay wall due to the tidal effect.