›› 2012, Vol. 33 ›› Issue (7): 1986-1992.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of characteristics of power function Mohr strength criterion for tailings material under high pressures

LIU Hai-ming1, 2, YANG Chun-he1, ZHANG Chao1, MAO Hai-jun1, CAO Jing2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Faculty of Civil Engineering and Architecture, Kunming University of Science and Technology, Kunming 650500, China
  • Received:2011-02-28 Online:2012-07-11 Published:2012-07-13

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Abstract: It is necessary for stability analysis of high tailings dams to grasp the strength property of tailings material under high pressures. The theoretical derivation of a general power function based on the Mohr criterion must satisfy restrictions { , , }. The high stress traixial test results indicate that the power function of Mohr criterion reflects the strength characteristics of tailings material well under high pressures. The grain-size distribution curves of the pre- and post- test show that tailings material particles will crush in the cutting process when the confining pressure reaches or exceeds the threshold value. The threshold value for tailings silt of copper mine in Dexing is 1 200 kPa, and for tailings sub-silt of copper mine in Dexing is 1 600 kPa. Research results can provide the theoretical basis for the stability analysis of high tailings dams.

Key words: tailings material, high pressures, Mohr strength criterion, power function, particle breakage

CLC Number: 

  • TU 411
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