›› 2007, Vol. 28 ›› Issue (6): 1197-1200.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Discussion on relationship between activation of discontinuities and disturbed zone in surrounding rock mass of tunnels

WU You-lun1，WANG Yuan-han2   

  1. 1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China; 2. College of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
  • Received:2005-07-20 Online:2007-06-11 Published:2013-09-13

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Abstract: The failures of rock masses are often resulted by sliding or extension of discontinuities. Based on the idea of effective shearing stress, the viewpoint of activation of surface discontinuities is put forward. Activated depths of surface discontinuities which surround a tunnel with circular cross-section are analyzed. Results demonstrate that the activated depths of discontinuities are influenced by their inclinations and shearing strengths; and shearing strength plays a very important role in them. Discontinuities with same inclinations result different activation depths at different zones around a tunnel. Fracture mechanics theories are employed to analyze the growth of wing cracks of surface discontinuities. It implies that the deepest possible location where a wing crack can initiate is just the place of critical activation point. So the possible maximum depth of disturbed zone surrounding a tunnel is just the activated depth of discontinuities.

Key words: surface discontinuities, activation, disturbed zone in surrounding rock mass, fracture mechanics

CLC Number: 

  • TD 325
  • Please send e-mail to pingzhou3@126.com if you would like to read full paper in English for free. Parts of our published papers have English translations.
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