Table 1 The representative correlations between UCS (MPa) and Brazilian tensile strength (MPa).

\(\:\text{UCS=(4-10)BTS}\)

–

–

–

Hosking²⁰

\(\:\text{UCS=(17-28)BTS}\)

–

Coal

–

Pomeroy and Foote²¹

\(\:\text{UCS=3.27BTS}-\text{0.97}\)

–

Limestone, sandstone, mudstone and siltstone

–

Hobbs²³

\(\:\text{UCS=2.84BTS}-\text{3.39}\)

–

Limestone, sandstone, mudstone and siltstone

–

Hobbs²⁴

\(\:\text{UCS=3.6}\text{BTS}\text{+15.2}\)

–

Coal measure rocks

229

Szlavin²²

\(\:\text{UCS=(8-14)BTS}\)

–

Igneous rocks (Hong Kong, China)

–

Lumb²⁵

\(\:\text{UCS=(7.9-9.72)BTS}\)

–

Granite, basalt, quartzite (India)

13

Gupta and Rao²⁶

\(\:\text{UCS=12.2BTS}\)

–

Limestone (Nigeria)

–

Teme²⁸

\(\:\text{UCS=(10-20)BTS}\)

–

Mudstone, limestone, granite, sandstone

–

Brook²⁹

\(\:\text{UCS=(5-50)BTS}\)

–

Various rock types

–

Lade³⁰

\(\:\text{UCS=6.71}\text{BTS}\text{+36.0}\)

0.61

Sandstone (South Africa)

27

Bell and Lindsay³¹

\(\:\text{UCS=(6.74-10.26)BTS}\)

–

Granite and limestone

–

Din and Rafiq³²

\(\:\text{UCS=6.67}\text{BTS}\text{+0.73}\)

0.92

Granite, granodiorite (Turkey)

10

Tuğrul and Zarif³³

\(\:\text{UCS=8BTS}\)

–

Brittle rocks

-

Brady and Brown³⁴

\(\:\text{UCS=6.8}\text{BTS}\text{+13.5}\)

0.65

Greywackes (Turkey)

82

Gokceoglu and Zorlu³⁵

\(\:\text{UCS=4.9BTS}\)

–

Calcarenite

5

Coviello et al.³⁶

\(\:\text{UCS=6.2BTS}\)

–

Gasbeton

\(\:\text{UCS=2.38}{\text{BTS}}^{\text{1.0725}}\)

0.79

Limestone, granite, marble (Turkey)

–

Altindag and Guney²⁷

\(\:\text{UCS=2.86}{\text{e}}^{\text{0.015}}\text{BTS}\)

-

Coal

–

Arioglu and Tokgoz³⁷

\(\:\text{UCS=10.61BTS}\)

0.54

Limestone, marble, Serpentinite (Turkey)

46

Kahraman et al.³⁸

\(\:\text{UCS=5.86}\text{BTS}\text{+17.5}\)

–

Limestone (Iran)

32

Rajabzadeh et al.³⁹

\(\:\text{UCS=8.60BTS}-\text{27.57}\)

–

Diagenetic dolomitic limestone (Iran)

\(\:\text{UCS=12.4BTS}-\text{9.0}\)

–

–

–

Sivakugan et al.⁴⁰

\(\:\text{UCS=7.22}\text{BTS}\text{+40.077}\)

0.61

Granite, granodiorite (Turkey)

6

Yesiloglu-Gultekin et al.⁴¹

\(\:\text{UCS=4.874}\text{BTS}\text{+24.301}\)

0.90

Metabasalt, dacite, basalt (Turkey)

37

Karaman et al.⁴²

\(\:\text{UCS=15.36BTS}-\text{10.303}\)

Shale, old alluvium (Nusajaya, Malaysia)

40

Mohamad et al.⁴³

\(\:\text{UCS=10.03}\text{BTS}\text{+55.19}\)

0.92

Hornfels schist (Iran)

8

Fereidooni⁴⁴

\(\:\text{UCS=10.4}\text{BTS}\text{+18.2}\)

0.63

Flint (Europe)

7

Aliyu et al.¹³

\(\:\text{UCS=3.469}\text{BTS}\text{+15.73}\)

Travertine (Iran)

32

Ebdali et al.⁴⁵

\(\:\text{UCS=7.73}{\text{BTS}}^{\text{1.197}}\)

0.90

Andesite, limestone, marble (Turkey)

93

Teymen and Mengüç⁴⁶

\(\:\text{UCS=4.2327}\text{BTS}\text{+13.638}\)

0.53

Gypsum (United Arab Emirates)

48

Arman⁴⁷

\(\:\text{UCS=7.26}\text{BTS}\)

0.95

Carbonate rocks (Iran)

107

Sadeghi et al.⁴⁸

\(\:\text{UCS=8.1442}\text{BTS}\)

0.83

Various

443

Kong et al.⁴⁹