›› 2014, Vol. 35 ›› Issue (6): 1579-1584.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Fracture coalescence mechanism of single flaw rock specimen due to freeze-thaw under triaxial compression

LU Ya-ni1，LI Xin-ping2，WU Xing-hong1   

  1. 1. School of Urban Construction, Hubei University of Technology，Xiaogan，Hubei 432000, China； 2. Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology, Wuhan 430070, China
  • Received:2013-08-14 Online:2014-06-10 Published:2014-06-20

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Abstract: Freeze-thaw test and triaxial compression test are carried out for model samples with pre-existing single fracture by the rock mechanical servo-controlled testing system, freeze-thaw damage degradation model is studied based on the freeze-thaw test, and crack coalescence mechanism is discussed under the triaxial compression condition. Tests reveal that: freeze-thaw damage deterioration modes of fractured rock masses are scattered to particle model, crack model and prefabricated crack fracture mode. Under the triaxial loading condition, there are four coalescence modes of fractured rock samples due to freeze-thaw cycles: tensile mode，shear mode，compression mode and mix mode, which are closely related to the freeze-thaw cycles, confining pressure and the crack dip angle. With the increase of freeze-thaw cycles and confining pressure, more and more surface ruptures are found, at the same time, crack coalescence mode has experienced from single to mix; the failure modes of rock samples show tensile and compression mode when confining pressure reaches the values of 2 MPa and 6 MPa, while tensile mode are presented when the confining pressure reaches the value of 4 MPa. Rock samples with smaller fissure angle which equals 30° are taken on tensile mode, however, the rock samples with the longer fissure angle of 60° take on shear mode.

Key words: rock mechanics, model material, conventional triaxial compression test, freeze-thaw cycles, coalescence mechanism

CLC Number: 

  • TU 452
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