journal6 ›› 2014, Vol. 35 ›› Issue (3): 59-63.DOI: 10.3969/j.issn.1007-2985.2014.03.013

• Machinery and Engineering • Previous Articles     Next Articles

Rheological Property and Pre-Stressed AnchorageTechnology of High Stress Soft Rock

 BAI  Qi-Shu, LIU  Xin-Xi, CHEN  Xiang-Yang, MAO  Guang-Xiang   

  1. (1.School of Civil and Architectural Engineering,Wuhan University,Wuhan 430072,China;2.School of Civil Engineering and Architecture,Changsha University of Science & Technology,Changsha 410114,China;3.Institute of civil engineering.Hunan City College,Yiyang 413000,Hunan China)
  • Online:2014-05-25 Published:2014-07-05

Abstract: With increasing depth of coal mining,roadway support problems in high-stress soft rock have become increasingly prominent.The supporting of soft rock roadway stability has become a major bottleneck for coal mine production safety.According to the curve  law and time-dependent properties,obtained by the soft rock graduation loading triaxial compression creep test,Burgers viscoelasticity rheologic model of argillaceous siltstone at high-stress situation was established.On the basis of viscoelastic plasticity mechanics theory,the one-dimensional creep constitutive equation of this model was derived,and then the model parameters were identified with the help of non-line regression.The imparts of  the pre-tension of bolts and cables on the creep of the high stress soft rock roadway was analyzed by FLAC3D.The results showed  that the creep of the high stress soft rock roadway  reduced when the pre-tension of bolts and cables increased,and the pre-tension of bolts and cables must exceed 100 kN and 900 kN.

Key words: high stress soft rock, rheology, rheological constitutive model;pre-stressed anchorage

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