The sample loading method and force condition are shown in Figure 1:
Figure 1 Principle of single-axis compression test
The sample is placed between the molds 2 and 3, and the pressure p is applied. After the pressure is increased to a certain extent, the shear force T which is decomposed by it will shear the rock, and the shear strength of the rock is:
Τs=T/A=(P/A)(sinα-f k cosα)
The area of ​​the A-shear plane in the formula, cm 2 ;
f k - friction coefficient, generally 0.15.
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