›› 2009, Vol. 30 ›› Issue (11): 3393-3398.

• Geotechnical Engineering • Previous Articles     Next Articles

Investigation of rock resistant coefficient in rocks around tunnel based on unified strength theory

MA Qing，ZHAO Jun-hai，WEI Xue-ying   

  1. School of Civil Engineering, Chang’an University, Xi’an 710061, China
  • Received:2008-04-10 Online:2009-11-10 Published:2010-01-07

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Abstract:

The rock resistant coefficient K is an important parameter and it reflects the resistance of the rock around the tunnel in the geotechnical engineering. A formula of rock resistant coefficient is derived based on unified strength theory, which can be adopted to obtain rock resistant coefficient in other situations or strength thoeries simplified by assuming the parameter value in the formula. The strength differential effect, intermediate principal stress effect and the ground water permeation effect are considered in the formula. The results indicate that the coefficient b, cohesion ,friction angle ?, the pore water pressure ,the in-situ stress and the lining pressure all have significant influences on the rock resistant coefficient K.

Key words: geotechnical engineering, unified strength theory, rock resistance coefficient, permeation effect, intermediate principal stress effect

CLC Number: 

  • TU 43
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