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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (4): 528-534.doi: 10.11872/j.issn.1005-2518.2018.04.528

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Similarity Simulation Experiment on Strength Distribution in Three-Dimen-sional Spatial of Cemented Tailing Backfill

Wenchen LI1,2,Lijie GUO1,2,*,Xinzheng CHEN1,2,Zongnan LI1,2,Xin LI1,2   

  1. 1Beijing General Research Institute of Mining and Metallurgy Technology Group，Beijing 102628，China
    2National Center for International Joint Research on Green Metal Mining，Beijing 102628，China
  • Received:2018-03-31 Revised:2018-05-18 Online:2018-10-10 Published:2018-10-17
  • Contact: Lijie GUO

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Abstract:

To discover the distribution law of cemented tailing backfill，a similarity simulation experiment was designed according to the size of sublevel filling open stope in a copper mine.According to Froude similarity criterion，filling experiments were carried out to simulate filling velocity and filling amount.Samples were drilled from three dimensional space and uniaxial compressive strength （UCS） experiments were performed on all samples.UCS distribution laws of cemented backfill samples in three dimensional were analyzed.The results show that：UCS of cemented tailing backfill①Shows marked nonuniform in sublevel open stope；②Step down and then rise in the longitudinal；③On the transverse，the middle is higher than the fringes；④On the vertical，the strength on bottom is commonly higher than the top.According to previous studies and this experiment，the nonuniform distribution of cemented tailing backfill is mainly caused by factors such as tailing gradation， cement content and slurry concentration during consolidation and flow settlement characteristics

Key words: cemented backfill, simulation experiment, three-dimensional space, strength distribution, tailings, flow deposition

CLC Number: 

  • TD853

Fig.1

Particle size distribution curve of classified tailings"

Fig.2

Schematic diagram of similarity simulation test platform for filling slurry flow in stope"

Fig.3

Similarity simulation test platform for filling slurry flow in stope"

Fig.4

Cemented filling body formed by filling slurry in the test device"

Fig.5

Schematic diagram of sampling in three-dimensional directional of filling body"

Fig.6

Sampling chart of filling body in similarity simulation test"

Fig.7

Test results of uniaxial compressive strength"

Fig.8

Uniaxial compressive strength distribution of filling body in the longitudinal"

Fig.9

Uniaxial compressive strength distribution of lower-level filling body in the longitudinal"

Fig.10

Uniaxial compressive strength distribution of middle-level filling body in the longitudinal"

Fig.11

Uniaxial compressive strength distribution of upper-level filling body in the longitudinal"

Fig.12

Uniaxial compressive strength distribution of filling body on the transverse"

Fig.13

Uniaxial compressive strength distribution of filling body on the vertical"

Fig.14

D50 distribution of medium diameter of filling slurry in the longitudinal"

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