Investigation on Mechanical Properties of Loess-based Cemented Paste Backfill and Numerical Back-Analysis.

To developed clean, efficient and economical filing materials for filing Ming requirements, LCPB was prepared by mixing loess, lily ash and a certain amount of gangue. The rheological properties, flow characteristics, UCS and damage evolution law of LCPB were investigated through a series of laboratory tests and numerical simulation. The results showed that the LCPB slurry with different ratios conformed to H-B rhea logical model, yield stress increased with the increase of loess dosages (92. 41-155. 42 Pa),loess dosages is greater than 15 wt.% to meet the gangue settlement requirements, slump increased with the increase of loess dosages and then decreased(LF-1- LF-4-LF-6 : 219-276-258 mm),and 28 d compressive strength decreased with the increase of loess dosages(4. 09 -2. 14 MPa). The 28 d compressive strength decreased with the increase of loess dosages(4. 09-2. 14 MPa), and the slump and compressive strength satisfied the ailing requirements of nine. The damage mode of the filing shifted from the dominant tenia damage to the dominant shear-tendon damage with the increase of loess dosages, and the damage stage showed the characteristic of the drastic energy accumulating nan front of the peak and then transforming into the dissipative energy icing rapidly. [ABSTRACT FROM AUTHOR]

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