Abstract
Sediment disasters cause landslide deaths, house damage, and traffic network shutdowns. Many local authorities specified the sediment disaster warning area and created a hazard map. However, the hazard map is based on an offline approach, which is insufficient for providing evacuation guidance for residents. Therefore, adaptive upgrading of hazard maps is required. The previous hazard map is based on a survey of the slope dimension and does not consider the soil internal parameter (i.e., soil cohesion, eigen friction angle). Thus, the sensing technology of the soil internal state is important to detect disaster signs. This study proposes a method for sensing the internal state of soil based on the natural frequencies of longitudinal vibration modes of elastic piles coupled to the ground. The internal state of the soil is defined by the adhesion force and the natural friction angle. This paper presents an integrated analysis of the natural frequencies of longitudinal expansion and contraction obtained from field experiments and soil test results obtained from compression tests.
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