›› 2010, Vol. 31 ›› Issue (2): 403-406.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Testing study of rheological characteristics of weathered granite in undersea tunnel project

ZHAO Xu-feng1, SUN Jun2   

  1. 1. China International Engineering Consulting Corporation, Beijing 100044, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
  • Received:2008-05-27 Online:2010-02-10 Published:2010-03-24

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Abstract:

In order to know about the rheological characteristics of rock specimens in undersea tunnel project, a series of triaxial compression rheological experiments were carried out on the rock servo-controlling rheology testing machine. Results show that creep characteristics of intensely weathered granite is more obvious than full weathered granite; and that creep deformation of rock greatly depends on the confining pressure. With increase of confining pressure, creep deformation of rock will decrease. By analysis of stress-strain relation, creep deformation has few effects on damage of rock during elastic stage; whereas viscoplasticity deformation has more effects on damage of rock during plastic stage. In order to keep stability of tunnel, confining pressure should be increased to improve yield strength of surround rocks and decrease rheological deformation by strengthening supporting structure.

Key words: undersea tunnel project, weathered granite, triaxial compression rheological experiments, creep characteristics

CLC Number: 

  • TU 458
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