›› 2013, Vol. 34 ›› Issue (7): 1861-1866.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of post-peak stress-strain curve of rock mass with multiple penetrative crack sets based on fractured rock samples

TONG Xing-hua1，HAN Jian-xin1, 2，LI Shu-cai1，LI Shu-chen1，YANG Wei-min1   

  1. 1. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China; 2. School of Mathematics and Quantitative Economics, Shandong University of Finance and Economics, Jinan 250014, China
  • Received:2012-07-18 Online:2013-07-10 Published:2013-07-15

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Abstract: In geotechnical engineering, fractured rock mass is often in the post-peak deformational state. It is important for predicting stability of structure to study post-peak stress-strain relationship of fractured rock mass. Based on the evolution of post-peak strength parameters, firstly, a method for solving the relations of post-peak stress-strain of rock and stress-shear displacement of crack is proposed. Then using Mohr-Coulomb strength criterion, regarding maximum principal strain of rock and shear displacement of crack as softening parameters, assuming the strength parameter as a piecewise linear function of softening parameters, in the two cases that the rock mass fails along the fracture and through the rock, the method for solving relation of post-peak stress-strain of rock mass with multiple penetrative crack sets is presented. Finally, in case study, the post-peak stress-stain curves are given in the two cases that the rock mass fails along the fracture and through the rock; and the effects of mean space, normal stiffness and shear stiffness of cracks on post-peak strain are discussed. The results show that the smaller the mean space, normal stiffness and shear stiffness of cracks are, the larger the axial strain of fractured rock mass is.

Key words: post-peak stress-strain curve, fractured rock mass, strength parameters, Mohr-Coulomb strength criterion, softening parameter

CLC Number: 

  • TU 45
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