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Three Dimensional Limit Analysis of Slope Stability with Nonlinear Criterion: Comparison the Effect of Volumetric Strain

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Abstract

In view of the complexity of three-dimensional analysis, traditional slope stability analysis was mainly conducted in 2-dimensional scope, namely in the case of plane strain condition. Based on the 3-dimensional failure mechanism proposed by Michalowski, three-dimensional upper bound analysis of the soil slope was presented in this paper. The two different conditions of both with and without volumetric strain taken into consideration are analyzed. The nonlinear failure criterion was introduced into analysis by virtue of the generalized tangential technique method, and the earthquake action was analyzed on the basis of pseudo-static method. The formulas of external work rate and interior energy dissipation were deduced, and the stability factors of slope with respect to diverse parameters were calculated through optimization. The results show that, with the increase of B/H, the difference between the stability factors of the two conditions decrease. Moreover, the change law of the stability factors of the different conditions is similar.

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Abbreviations

σ 1, σ 3 :

Maximum and minimum principal stresses

M p *, M p and q p :

Parameters related to c and φ, can be determined by triaxial test

C :

Cohesion of soil

φ :

Internal friction angle

γ :

Soil density

c 0 :

Cohesion of soil for nonlinear Mohr–Coulomb failure criterion

m :

Nonlinear coefficient for nonlinear Mohr–Coulomb failure criterion

τ :

Shear strength

σ n :

Normal stress

σ t :

Uniaxial tensile strength

r :

Expression of AC of the failure mechanism in Fig. 2

r′:

Expression of AC′ of the failure mechanism in Fig. 2

r m :

Generatrix of conic section of the failure mechanism

R :

Radius of a cross section of the failure mechanism

Ω :

Rate of rotation of the moving mass

V :

Linear velocity of a soil weight element

dV :

Volume of a soil weight element

θ :

Rotation angle of the failure mechanism

θ 0, θ B and θ h :

Rotation angles of the failure mechanism (see in Fig. 2)

W soil :

Soil weight work rate of rotating body

W γ-insert :

Soil weight work rate of insert block

\(W_{{k_{h} {\hbox{-}} soil}}\) :

Seismic forces work rate on rotating body

\(W_{{k_{h} {\hbox{-}} insert}}\) :

Seismic forces work rate on insert block

D t :

Internal energy dissipation

S t :

The velocity discontinuity surface

b :

Width of the insert block

B :

Width of the whole failure mechanism

D AB :

Internal energy dissipation of section θ 0 − θ B of rotating body with the consideration of volumetric strain

D BC :

Internal energy dissipation of section θ B  − θ h of rotating body with the consideration of volumetric strain

D insert :

Internal energy dissipation of section on plane insert mechanism with the consideration of volumetric strain

\(D^{\prime}_{AB}\) :

Internal energy dissipation of section θ 0 − θ B of rotating body without the consideration of volumetric strain

\(D^{\prime}_{BC}\) :

Internal energy dissipation of section θ B  − θ h of rotating body without the consideration of volumetric strain

\(D^{\prime}_{insert}\) :

Internal energy dissipation of section on plane insert mechanism without the consideration of volumetric strain

H :

Critical height of slope

N n :

Stability factor of slope

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Appendix

Appendix

$$f_{1} = \frac{1}{{3(1 + 9\tan^{2} \varphi )}}\left[ {(3\tan \varphi \cos \theta_{h} + \sin \theta_{h} )e^{{3(\theta_{h} - \theta_{0} )\tan \varphi }} - 3\tan \varphi \sin \theta_{0} + \sin \theta_{0} } \right]$$
$$f_{2} = \frac{1}{6}\left( {2\cos \theta_{0} - \frac{L}{{r_{0} }}} \right)\frac{{L\sin \theta_{0} }}{{r_{0} }}$$
$$f_{3} = \frac{1}{6}e^{{(\theta_{h} - \theta_{0} )\tan \varphi }} \left[ {\sin \left( {\theta_{h} - \theta_{0} } \right) - \frac{L}{{r_{0} }}\sin \theta_{h} } \right]\left[ {\cos \theta_{0} - \frac{L}{{r_{0} }}\cos \alpha + \cos \theta_{h} e^{{(\theta_{h} - \theta_{0} )\tan \varphi }} } \right]$$
$$f_{4} = \frac{1}{{3(1 + 9\tan^{2} \varphi )}}\left[ {(3\tan \varphi \sin \theta_{h} - \cos \theta_{h} )e^{{3(\theta_{h} - \theta_{0} )\tan \varphi }} - 3\tan \varphi \sin \theta_{0} + \cos \theta_{0} } \right]$$
$$f_{5} = \frac{1}{6}\left( {2\sin \theta_{0} + \frac{L}{{r_{0} }}} \right)\frac{{L\sin \theta_{0} }}{{r_{0} }}$$
$$f_{6} = \frac{1}{6}e^{{(\theta_{h} - \theta_{0} )\tan \varphi }} \frac{H}{{r_{0} }}\frac{{\sin \left( {\theta_{h} + \beta } \right)}}{\sin \beta }\left[ {2\sin \theta_{h} e^{{(\theta_{h} - \theta_{0} )\tan \varphi }} - \frac{H}{{r_{0} }}} \right]$$

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Liu, F., Rui, Y. & Zhang, C. Three Dimensional Limit Analysis of Slope Stability with Nonlinear Criterion: Comparison the Effect of Volumetric Strain. Indian Geotech J 47, 57–66 (2017). https://doi.org/10.1007/s40098-016-0193-7

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