Rock Mechanics is the branch of engineering that focuses on the mechanical behavior of rocks under different conditions, such as stress, strain, and temperature.

The strength of a rock is its ability to resist deformation or failure under applied stress.

Creep is the time-dependent deformation of rocks under sustained stress, where the deformation continues even after the stress is applied.

Brittle failure is characterized by a sudden and complete rupture of the rock, with minimal deformation prior to failure.

Toughness is the amount of energy a rock can absorb before failure, representing its resistance to fracture.

In most cases, the relationship between stress and strain in rocks is linear, known as Hooke's Law, where strain is directly proportional to stress.

The angle of repose is a measure of the stability of loose material, such as soil or rock fragments.

Elasticity is the property of a rock to return to its original shape and size after the removal of applied stress.

Plastic failure is characterized by permanent deformation of the rock without complete rupture.

Stiffness is the measure of a rock's resistance to deformation under stress, representing its ability to transmit stress.

Porosity is the measure of the void space or pores within a rock, which can influence its permeability and fluid flow properties.

Permeability is the measure of a rock's ability to allow fluids, such as water or oil, to flow through its pores.

Compressibility is the measure of a rock's ability to undergo volume change under applied stress.

Durability is the measure of a rock's resistance to weathering and erosion processes over time.

Hardness is the measure of a rock's resistance to scratching or abrasion, often determined using the Mohs scale.