›› 2013, Vol. 34 ›› Issue (S2): 237-241.

• Geotechnical Engineering • Previous Articles     Next Articles

Modified finite element method for shear strength reduction and instability criterion in slope stability analysis

SHI Jian-yong，CAO Qiu-rong，ZHOU Lu-fei   

  1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China
  • Received:2013-03-31 Online:2013-11-11 Published:2013-11-19

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Abstract: The finite element method for strength reduction recently used in slope stability analysis has disadvantages in revelation of soil deformation behavior and instability criterion. Based on stress strain curves of soil, Duncan-Zhang nonlinear elastic model and direct reduction of strength parameters (cohesion c and friction angle φ) of soil, discount method for tangent modulus Et is presented. The connotation of reduction is entirely revealed. And the exchange of deformation energy in potential slip area is proposed as instability criterion. On the characteristics of relation curve of deformation energy in slip area and reduction coefficient, two straight lines are drawn, the value of reduction coefficient at intersection point of the two lines is choice of safety factor of slope stability. The calculation results by modified Duncan’s finite element method with new instability criterion and references are compared, the influence of calculation area on deformation energy is analyzed, the new method is used in slope stability analysis of south channel of East line in South-to-North Water Diversion Engineering. All results show that the soil behaviors of deformation and strength are more entirely considered in modified Duncan’s finite element method for shear strength reduction, new instability criterion of slope is reliable and calculation is steady; safety of slope construction can be ensured.

Key words: strength reduction method, tangent elastic modulus, deformation energy, instability criterion

CLC Number: 

  • TU457
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