Table 2 Physical and mechanical parameters of ore rock and filling body.

From: Research and engineering practice of high stage and long span complex goaf filling treatment technology

Category

Cemented backfill

Low-strength filling body

Clay

Concrete

Elastic modulus (GPa)

0.615

0.615

10

30

Poisson’s ratio

0.28

0.30

0.3

0.2

Tensile strength (MPa)

0.14

0.02

0.002

2.4

Internal friction angle (°)

46.5

53.1

16

55

Compressive strength (MPa)

1.04

0.2

0.02

45

Density (g cm− 3)

2.000

1.800

1.900

2.500

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