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Multidisciplinary Perspectives in Understanding Slow-moving Landslide
( Wei-an Chao ),( Ming-chien Chung ),( Keng-hao Kang ),( Chih-pin Lin ),( Tung-lin Tai ),( Hao-wen Yang ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Landslides have caused extensive infrastructure damage and threatened the human fatalities through the centuries. Among all triggered factors, massive precipitation and large earthquakes are considered to be the two key activators for pushing landslide moving, particularly for catastrophic landslides. The most acceptable mechanism resulting the landslide movement is liquefaction due to increasing water pore pressure. In this study, a landslide site has been well understood by hydrological, geophysical, geological, geodetic, geotechnical and seismological (H4GS) perspectives. Our seismic monitoring of daily relative velocity changes (dv/v) in sliding material decreased coinciding with first-half rainy period yet increased observing in post-half raining event. Geodetic survey (real-time kinematic, RTK; total station) before and after rainy period presents the vertical subsidence without any horizontal movement. The results from multidisciplinary investigation allow us to draw the conceptual model of landslide healing process caused by the water loading. Under the stability condition (F > 1.0) for each sliding materials, unconsolidated landslide colluvium and impermeable sliding surface could trap the seepage water to be as water pool, provided compact force acting on the materials below the sliding boundary. The vertical force of compaction facilitates to increasing the cohesion and strength of materials, tending the landslide material to be much stability. We demonstrated that healing process is periodically occurred but only for prolonged and intense precipitation combined with stability condition.