LANDSLIDE ANALYSIS IN TAIWAN

I.INTRODUCTIONForagrowingandprogressivesocietywitheconomicadvancement.Wehavetodoourbesttomanageintensivelyoursoilandwaterresources.Wehavetousethemforgenerationstocomeandthereforewemustprotectandimprovethematthesametime.TaiwanisanislandlocatedintheweSternPacificOcean,andhasanareaof36,000Km2.ItresemblesashapeoftobaccoleafandiscomPOsedoftwo-thirdsmountains.Theaverageannualrainfallisconcentrated70%ofitstotal2510nunintheperiodofMaytoSeptember,theothermonthsaremostlydry.Becauseoftheprecipi…

LANDSLIDE ANALYSIS IN TAIWAN

This study describes the methodology and techniques developed to analyse landslide-prone areas in Taiwan. The field work for this study was conducted in the watershed of An-tung, Hua-lien Hsien. The methodology used are: frequency analysis of storm events, electric specific resistance measurements, and fourteen, 20 m field borings in the study area. The physical and mechanical properties of the soil and geologic strata were determined from the borings. Strain-gage surveys were used to determine the displacement of the landslide layer. In each boring, a fluorescent tracer, specific resistance, salt logging of the groundwater, and the soil temperature at 1 m were used to determine the paths of groundwater flow. The results of the extensive analysis clearly identified that the layer most susceptible to failure is at 3.5 m to 5.5 m, with a resolution of 50 cm. The methodology and techniques developed in this study can be used to analyse suspected landslide areas to determine their locations and depths for the purpose of installation of drain tiles to prevent slope failure.