| Summary: | 碩士 === 國立中興大學 === 水土保持學系所 === 107 === The groundwater rise is easy to cause landslide. In this study, the relationship between groundwater level rise and slope landslide is discussed by sandbox test. During the test, the measurement includes the changes of pore pressure, water content, tension, self-potential and seismic signals generated by landslide.The slope model in the sandbox test is 160cm long, 100cm wide and 80cm high, and is installed with accelerometers, non-polarized electrodes, pore pressure sensores, water content sensores, soil tensiometers and differential-multilayer-resistence meter for measuring related physical data. This study used Hilbert-Huang Transform to analyze the seismic signals generated during the test. The test results show that the rise of the groundwater level leads to erosion and landslide of the slope of the model slope. The seismic singal caused by the landslide can correspond to different landslide patterns and landslide volumes. When the water level rises and contacts the non-polarized electrode, the self-potential will rise, this can indicate the position of the water table movment. After the landslide, the self-potential will drop instantly, this indicate the timing of landslide; and then self-potential will slowly rise again.
Furthermore, this study also compares the changes in water content and tension during the groundwater rising and landslide. The demonstration of vibration and natural potential measurement in this study also has the opportunity to expand the application of actual slope monitoring in the field.
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