›› 2013, Vol. 34 ›› Issue (4): 1140-1146.

• Numerical Analysis • Previous Articles     Next Articles

Research on progressive failure for slope using dynamic strength reduction method

CHEN Guo-qing1, HUANG Run-qiu1, ZHOU Hui2, XU Qiang1, LI Tian-bin1   

  1. 1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
  • Received:2012-08-14 Online:2013-04-10 Published:2013-04-16

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Abstract: The failure of slope is a progressive process which from quantitative changes to qualitative changes. The whole sliding surface will be taken place by gradual damage of the potential sliding surface in the slope body gradually. Based on the strength reduction method, dynamic strength reduction method that can simulate the progressive failure of slope was proposed. At first, yielding approach index(YAI) is used to appraise the damaged region of slope in the numerical simulation, the region that YAI is less than 0.2 is recognized as the damaged region. Then through the continuous local damage reduction of the strength parameters of the local slope body, the potential sliding surface is damaged gradually and evolved to breakthrough finally. The practical results show that the proposed method can settle the reduction region in the strength reduction method effectively; and overcome the defect of large plastic damage area by the whole strength reduction method. The trend of displacement and damage area change also has better consistency in the reduction process. Dynamic strength reduction method can simulate the progressive failure of the slope truly; and it provides quantitative basis of slope stability appraising for strength reduction method.

Key words: slope engineering, progressive failure, dynamic strength reduction, instability criterion, stability evaluation

CLC Number: 

  • TU 473
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