›› 2014, Vol. 35 ›› Issue (S1): 173-180.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Realization of rock mass nonlinear strength characteristics in unified strength theory based on brittle-shear strength analysis

LI Yuan1，LI Zhen1，QIAO Lan1，LI Miao1   

  1. State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2013-03-15 Online:2014-06-10 Published:2014-06-20

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Abstract: Considering the limitation of the unified strength theory (UST) in nonlinear fitting and nonlinear features of geotechnical materials, a brittle-shear strength analysis method is proposed; and a transition bilinear formula is derived. Nonlinear strength feature of Hoek-Brown criterion is explained based on the double failure mechanism of fracture and shear; and an associated formula with highly correlation is obtained. Mine-by tunnel and the strength of Beishan granite data results analysis show that coefficients of correlation of Hoek-Brown rock mass strength, experimental data and brittle-shear strength values are all above 0.98. Twin formulas of Hoek-Brown criterion in the form of UST are derived based on the brittle-shear nonlinear fitting. Application of UST to fitting nonlinear strength of geotechnical materials is realized.

Key words: brittle-shear, constitutive relation, unified strength theory, Hoek-Brown failure criterion

CLC Number: 

  • TU 452
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