›› 2011, Vol. 32 ›› Issue (10): 2998-3003.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental research on pre-peak constitutive relation of filled fracture with expansive medium

CHEN Jin-gang1, XU Ping2, ZHANG Yan3, LI Ya-bang1   

  1. 1. Department of Engineering Mechanics, Zhengzhou University, Zhengzhou 450001, China; 2. School of Water Conservancy and Environment, Zhengzhou University, Zhengzhou 450001, China; 3. School of Civil Engineering , Zhengzhou University, Zhengzhou, 450001, China
  • Received:2010-06-22 Online:2011-10-10 Published:2011-10-13

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Abstract: Taking Na-bentonite as filling medium and cement mortar as fissure wall, the filled fractures are made. By means of normal compression and lateral restraint, the constitutive relations of filled fracture with expansive medium and under the conditions of different fracture widths and different water contents, are discussed. A large number of stress-strain data are obtained. It is shown that the fractures filled with expansive medium can be divided into three stages: rheological phase, compression phase and the elastic stage in the pre-peak. At the beginning of the experiment, the filled fracture is in the rheological state; that is to say, the stress nearly remains unchanged, but the strain continues to increase. With the finite deformation and the normal stress increase, the filled fracture overall intensity increase, and demonstrate elastic characteristics gradually. Based on the results, the mechanical model of inverted Saint-Venant body is put forward; pre-peak constitutive equation of filled fracture with expansive medium is established; and its mechanism is analyzed.

Key words: expansive media, filled fracture, constitutive relation, uniaxial compression, inverted Saint-Venant body

CLC Number: 

  • TU 458.3
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