| Summary: | 碩士 === 高苑科技大學 === 土木工程研究所 === 99 === It is a dip slope with mudstone and sandstone interbedded at the northward 363K National Highway NO.3. in Taiwan. The continuously heavy rain led the slope sliding on August 19, 2010. This study analyses the slope stability by the finite element method of program PLAXIS-2D, and explores the suitability of various control engineering methods.
It is named analysis before design with anchors in this study before September 2010. The aim is to search the original parameters of the ground by comparing a potential sliding surface with monitor data of site. Then countermeasure analyzes the impact based on the loss of anchor prestress, groundwater level and the row of piles set. The aim is to prove the original site soil parameters and long-term stability under different conditions.
From the results of analysis, sliding surface analysis and the data which was derived from the early monitor judgments are consistent. The ground anchor has been unable to achieve good stable slope effect for the slope sliding, due to heavy rains. When the ground anchor prestress gradually decreased, left the original prestress less than 40%, safety factor decreased. Safety factor is lower when the ground water levels rise. As this condition is associated with earthquake and topsoil wet, safety factor will be lower. However, the rows of pile construction significantly improved the stability of the slope.
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