Table 1 Rock target strength and proportioning scheme.

From: Effect of thickness ratio on uniaxial mechanical behavior of soft-hard composite rock masses: experimental analysis and modeling

Typology

Ration program

Target strength

Cement

Gypsum

Quartz sand

Water cement ratio

Uniaxial compressive strength /MPa

soft rock

1

0.4

0.7

0.60

15

hard rock

1

0.1

0.9

0.50

50

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