›› 2013, Vol. 34 ›› Issue (4): 981-986.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Analysis of triaxial stress relaxation properties of red silty mudstone of Yichang-Badong highway

TIAN Hong-ming, CHEN Wei-zhong, ZHAO Wu-sheng, TIAN Tian, YUAN Ke-kuo   

  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechancis, Chinese Academy of Sciences, Wuhan 430071, China
  • Received:2012-02-21 Online:2013-04-10 Published:2013-04-16

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Abstract: Study of stress relaxation properties of soft rock is an important aspect of long-term mechanical property, which is very important to keep soft rock tunnel long-term stability. The stress relaxation test of red silty mudstone under triaxial compression with confining pressure of 30 MPa is carried out on TLW-2000 triaxial rheological machine. The test results show that: with the deterioration of material properties and relaxation damage evolution, the process of stress relaxation is nonlinear. By analyzing the damage energy dissipation during stress relaxation, a new relaxation damage equation is established. And, a nonlinear relaxation model is established by introducing the damage factor into Nishihara model. The fitting results of stress relaxation test show that the stress relaxation properties are well reflect by this model. The research results provide a scientific basis for long-term stability analysis of soft rock tunnel for Yichang-Badong Expressway.

Key words: soft rock, stress relaxation property, damage, Nishihara model

CLC Number: 

  • TU 452
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