Table 4 Polynomial function fitting results.

From: Diffusion law of coal gangue slurry and the application of fluidized filling technology of gangue in caving area

Fitted function category

Coal gangue particle size/mm

Fitted function

R2

Extensibility

0.2

y = 0.0833x3–1.5893x2 + 10.851x + 4.4048

0.9892

0.5

y = 0.1456x3–1.7457x2 + 6.9897x + 21.595

0.7095

Slump

0.2

y = 0.0017x3–0.0257x2 + 0.1786x + 14.242

0.9988

0.5

y = 0.0002x3 + 0.0031x2 + 0.0303x + 14.171

0.9966

Bleeding rate

0.2

y =  − 0.0547x3 + 0.4911x2 + 3.1751x + 4.4086

0.9660

0.5

y =  − 0.174x3 + 2.9034x2–7.2409x + 22.186

0.9799

Initial setting time

0.2

y = 0.0216x3–0.1284x2 + 1.8614x + 74.479

0.9970

0.5

y =  − 0.0733x3–0.5552x2 + 3.1598x + 68.349

0.9959

Final setting time

0.2

y =  − 0.0263x3 + 0.5848x2–1.0679x + 94.121

0.9954

0.5

y =  − 0.0025x3 + 0.2389x2 + 0.339x + 89.693

0.9995

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