Limit equilibrium method （LEM） of slope stability and calculation of comprehensive factor of safety with double strength-reduction technique

When the slope is in critical limitequilibrium （LE） state, the strength parameters havedifferent contribution to each other on maintainingslope stability. That is to say that the strengthparameters are not simultaneously reduced. Hence,the LE stress method is established to analyze theslope stabilit...

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Bibliographic Details
Published in:山地科学学报：英文版 2017, Vol.14 (11), p.2311-2324
Main Authors: DENG Dong-ping, LI Liang, ZHAO Lian-heng
Format: Article
Language:English
Subjects:
charts
Comprehensive
criterion
Double
Factor
FOS
M-C
Mohr-Coulomb
Nonlinear
ofSafety
Slope
stability
strength-reduction（DSR）
technique
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Summary:When the slope is in critical limitequilibrium （LE） state, the strength parameters havedifferent contribution to each other on maintainingslope stability. That is to say that the strengthparameters are not simultaneously reduced. Hence,the LE stress method is established to analyze theslope stability by employing the double strength-reduction （DSR） technique in this work. Forcalculation model of slope stability under the DSRtechnique, the general nonlinear Mohr-Coulomb （M-C） criterion is used to describe the shear failure ofslope. Meanwhile, the average and polar diametermethods via the DSR technique are both adopted tocalculate the comprehensive factor of safety （FOS） ofslope. To extend the application of the polar diametermethod, the original method is improved in theproposed method. After comparison and analysis onsome slope examples, the proposed method＇sfeasibility is verified. Thereafter, the stability charts ofslope suitable for engineering application are drawn.Moreover, the studies show that： （x） the averagemethod yields similar results as that of the polar-diameter method; （2） compared with the traditionaluniform strength-reduction （USR） technique, theslope stability obtained using the DSR techniquetends to be more unsafe; and （3） for a slope in thecritical LE state, the strength parameter c, i.e.,internal friction angle, has greater contribution on theslope stability than the strength parameters c, i.e.,cohesion.
ISSN:1672-6316
1993-0321