›› 2011, Vol. 32 ›› Issue (1): 261-268.

• Numerical Analysis • Previous Articles     Next Articles

Calculation method and parameter research for time-history of factor of safety of slopes subjected to seismic load

KANG Yong-jun，YANG Jun，SONG Er-xiang   

  1. Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China
  • Received:2009-10-27 Online:2011-01-10 Published:2011-01-19

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Abstract:

A method to calculate the time-history of safety factor of slopes subjected to seismic load is given. At every moment, the stress field got from dynamic finite element analysis, and the critical slip surface is searched by genetic algorithm. So, the time-history of factor of safety is derived and has definite physical meaning. By inputing sine wave acceleration with different periods from the bed rock, the relation between the period and the factor of safety is studied. The results show that as the period of input becomes longer, the factor of safety becomes lower. The natural period and mode shape of the slope are investigated; and one can find the amplification of dynamic response cause by the coupling of the load period and the natural period of slope not only depends on the coupling of the period, but also the mode shape of the slope. Only when the mode shape is a vibration of the slope itself, the dynamic response will be amplified and the factor of safety will decrease.

Key words: slope stability, dynamic, factor of safety, time-history, genetic algorithm

CLC Number: 

  • TU 435
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