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Heping District, Taichung City, Central Taiwan D045&D046 Large-scale Landslide Area Investigation
( Chuan Ding ),( Ho-hsun Chen ),( Shu-ken Ho ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The survey area, Songbo settlement, is located at Lishan area, Heping District, Taichung City near Techi Reservoir watershed, central Taiwan. There are many geomorphological features related to landslide and were divided into two large-scale landslide areas numbered as D045 and D046 by Central Geological Survey, MOEA. D046 has higher landslide-potential than D045. In order to ensure the operation of the Techi Reservoir and the safety of the Songbo settlement, the Taichung Branch of the Soil and Water Conservation Bureau promoted the project and carried out investigation and planning work. The stratum that produced the displacement at that time was explained to be the BIMROCK layer and the stratum is relatively stable. The unstable stratum is distributed in the colluvium (CV) and its thickness from a few meters to more than 50 meters. Through the field survey results including surface seepage points investigating, road cracks and subsidence sketching, gully and drainage ditch conditions investigating, construction, poles and trees investigating, and cracks in retaining walls sketching, etc., only local area shows higher landslide potential but whole area. Besides, monitoring data such as inclinometers casing, GPS, groundwater level observation and field survey results can identify the anomalies found in the activity of potential landslide bodies.