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Abstract To reveal the dynamic stability of high rockfill embankment with 72 m height on steep slope and provide reference for its quality control，By analyzing the rupture modulus of high embankment on steep slope and treatment measures for foundation，potential slipping circular arc of high rockfill embankment during construction is proposed. By analyzing the interaction between soil and reinforcement and references about previous triaxial test result，the mechanism that Geogrid improves the stability of embankment is expounded. Based on Sweden arc method of limit equilibrium theory，considering the filling process as 72 steps，the character of potential slipping circular arc at different layers are analyzed；the most dangerous sliding surface position is searched out；and the corresponding minimal safety factors are calculated. The results show that：With the increase of embankment¢s filled height，the potential slipping circulars moved to embankment body and its bottom. With the increasing of embankment¢s filled height and the surface slope，the minimal safety factors gradually decreased and the minimal safety factors occurred in the top layer；the overall stability meets the requirement of the specifications. Influenced by steep slope terrain，the safety factor changes obviously during the height between 32–48 m. Therefore，in the process of filling，the filling height and the changes in terrain should be paid more attention to，and corresponding measures should be taken to control the stability by the monitoring results.
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Received: 22 April 2009
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