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Metal Mine ›› 2022, Vol. 51 ›› Issue (11): 271-276.

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Bleeding Characteristics of Coarse Aggregate Filling Slurry and Its Influence on the Performance of Backfill

XU Yi′an1 DENG Botuan2 #br#   

  1. 1. Department of Architectural Engineering,Anyang Vocational and Technical College,Anyang 455000,China;2. School of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi′an 710054,China
  • Online:2022-11-15 Published:2022-12-08

Abstract: In order to analyze the variation characteristics of bleeding rate of coarse aggregate slurry under different influencing factors and the relationship between bleeding rate and slurry slump,an experimental study on the characteristics of bleeding rate of coarse aggregate filling slurry was carried out in the laboratory.The effects of material composition,mass concentration and cement content on the bleeding rate of slurry were analyzed,and the relationship between the bleeding rate of coarse aggregate slurry and slump was further explored.The results show that the bleeding rate of tailings slurry decreases with the increase of slurry concentration,and the decrease of bleeding rate gradually decreases with the increase of cement content.When the bleeding rate is similar,the mass concentration of tailings slurry is significantly lower than that of coarse aggregate slurry,indicating that the incorporation of waste rock can help the mine to achieve high concentration slurry filling.The bleeding rate of coarse aggregate slurry also showed a trend of decreasing with the increase of mass concentration,but the decrease of bleeding rate showed a trend of decreasing with the increase of coarse aggregate content.The bleeding rate of slurry decreases with the increase of cement content,and the decrease of bleeding rate increases with the increase of concentration.The slump of slurry gradually increases with the increase of bleeding rate.Therefore,the transport performance of slurry can be qualitatively judged by the change of bleeding rate parameter.

Key words: mine filling,coarse aggregate,exudation rate,mass concentration,backfilling,filling slurry