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Numerical Analysis of the Ground Anchor and Row Piles in Mudstone Dip Slope

It is a dip slope with mudstone and sandstone interbedded at the northward 363K National Highway NO.3. in Taiwan. The Figure 1 showed the slope sliding due to continuous heavy rain 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 and the row of piles set. 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. However, the rows of pile construction significantly improved the stability of the slope.