›› 2013, Vol. 34 ›› Issue (12): 3464-3470.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

The change laws of flow characteristics of backfill paste mixed by unclassified tailings and waste rock

SUN Wei1, 2, WU Ai-xiang1, 2, WANG Hong-jiang1, 2, ZHOU Yu1, 2, XIONG You-wei3, YI Hai-bao4   

  1. 1. Key Laboratory of Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China; 2. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; 3. Changsha Engineering & Research Institute of Nonferrous Metallurgy, Changsha 410011, China; 4. Sinosteel Maanshan Institute of Mining Research Co., Ltd., Maanshan, Anhui 243004, China
  • Received:2012-09-10 Online:2013-12-10 Published:2013-12-19

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Abstract: Mass fraction and waste rock proportion are main influence factors which affect flow characteristics of backfill paste mixed by unclassified tailings and waste rock. To study of the influence law of these factors about paste flow characteristics may have important significance about controlling paste flow characteristics. Shear test of mixed backfilling is conducted with the improved small direct shear device and then get the change law of mixed backfilling. The test results show that paste presents approximate elastic at prophase of force-deformation and the stepladder trend in displacement-shear stress curve increases with the increase of waste rock proportion. Cohesion of paste depends on mass fraction and internal fraction angle is affected by mass fraction and waste rock proportion almost the same, and that is combined effect. When mass fraction in the range of 80%-88%, cohesion pretends as nonlinear growth with the increase of mass fraction, internal fraction angle and mass fraction presents S-type trend, shear strength increases with the increase of mass fraction and varies significantly when in the range of 82%-84%; at the same time, flow characteristics is mutation.

Key words: subsidence area, mixed backfilling, flow characteristics, tailings-waste rock, paste

CLC Number: 

  • TD 853
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