Point Load Strength Index:-
Point load test is another simple index test for rock material. It gives the standard point load index, Is(50), calculated from the point load at failure and the size of the specimen, with size correction to an equivalent core diameter of 50 mm.
Fracture Toughness:-
Fracture toughness of rock materials measures the effectiveness of rock fracturing. It is typically measured by a toughness test. There are three fracture mode: (Mode I), (Mode II), (Mode III). Correspondingly, there are three fracture
toughness, KIC, KIIC and KIIIC.
Brittleness:-
Tendency of a material to fracture or fail upon the application of a relatively small amount of force, impact, or shock. Opposite of toughness.
Indentation:-
Swelling:-
Some rocks swell when they are situated with water. As discussed in Chapter 2,
swelling is governed by the amount of swelling montmorillonite clay minerals in the rock material.
Rock swelling is measured in confined and unconfined conditions. Unconfined
swelling is measured by the percentage increase of length in three perpendicular
directions, when a rock specimen is placed in water.Confined swelling index measures swelling in one direction while deformations in other two directions are constrained.
Point load test is another simple index test for rock material. It gives the standard point load index, Is(50), calculated from the point load at failure and the size of the specimen, with size correction to an equivalent core diameter of 50 mm.
Fracture Toughness:-
Fracture toughness of rock materials measures the effectiveness of rock fracturing. It is typically measured by a toughness test. There are three fracture mode: (Mode I), (Mode II), (Mode III). Correspondingly, there are three fracture
toughness, KIC, KIIC and KIIIC.
Brittleness:-
Tendency of a material to fracture or fail upon the application of a relatively small amount of force, impact, or shock. Opposite of toughness.
Indentation:-
Swelling:-
Some rocks swell when they are situated with water. As discussed in Chapter 2,
swelling is governed by the amount of swelling montmorillonite clay minerals in the rock material.
Rock swelling is measured in confined and unconfined conditions. Unconfined
swelling is measured by the percentage increase of length in three perpendicular
directions, when a rock specimen is placed in water.Confined swelling index measures swelling in one direction while deformations in other two directions are constrained.
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