›› 2009, Vol. 30 ›› Issue (S1): 195-200.

• Geotechnical Engineering • Previous Articles     Next Articles

Analysis of tunnel rock damage evolution process in excavation and predicting mechanical parameters

WANG Suo 1, 2, ZHAO Ming-jie1, JIANG Shu-ping3, YI Li-yun1, 4, LIN Zhi3   

  1. 1. School of River & Ocean Engineering, Chongqing Jiaotong University , Chongqing 400074, China; 2. Sichuan College of Architectural Technology, Deyang 618000, China; 3. Chongqing Communications Research and Design Institute, Chongqing 400067, China; 4. Deparment of Communications, Sichuan College of Architectural Technology, Deyang 618000, China
  • Received:2009-03-20 Online:2009-08-10 Published:2011-03-16

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Abstract:

The reliability of the conclusion by numerical methods depends on the selection of mechanical parameters of rock mass. Based on the damage evolution analysis of rock, the relationship between the damage variable and the mechanical parameters is studied. It brings forward a method of estimating rock material parameters (elastic modulus, Poisson’s ratio, cohesion and friction angle) by damage variable. Firstly, it analyzes rock damage evolution process of highway tunnel in excavation by bifurcation orientation. Secondly, it defines the initial damage variable by elastic p-wave velocity, and sets up ANSYS numerical model of the progressive destruction tunnel according to the site monitoring data of Bicheng tunnel. An example is given to estimate and analyze the macroscopical mechanical parameters of various surrounding rocks. The analytical results reveal that this method can effectively determine the magnitude and estimate the macroscopical mechanical parameters.

Key words: highway tunnel, damage evolution, mechanical parameters of surrounding rock, elastic wave velocity

CLC Number: 

  • U 45
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