Abstract
Tengjhih (Laonong) path, 20km in length, is under administration of the Pingtung Forest District. It is the only and important road to reach Tengjhih Forest Recreation Area and its nearby villages. Along Tengjhih forest roads, due to fragile geological conditions, heavy rainfall, headwater erosion, and weathering processes, slopes often collapse. On 2009.08.08, Typhoon Morakot with a heavy rain that hit Tengjhih forest roads,along which part of roadbed was eroded seriously and hillsides were harmfully damaged. The research adopts 5K+400m and 6K+700m sites to evaluate the potential mudflow and landsides along forest road. The study takes following processes: Firstly, subsurface drilling and monitoring to obtain data which will be analyzed for the two slopes. Secondly, using STABL to perform a static simulation, under rainstorm and earthquake, by using limit balance method to evaluate hillside stability. Thirdly, after judging this area’s damage mechanism and the possible location of slip surface, the study compares the analytical results of safety factor with design specification. Fourthly, if safety factor is lower than a critical value, it would proceed another analysis of the slope with remediation measures being simulated.Finally, the results of analysis provide authorized officials to gain as a reference for Tengjhih forest roads’ follow-up conservation of hillside project. Keyword：Tengjhih forest roads, STABL, Slope stability analysis
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