Rock Mechanics (Terms) - PRELIM TOPIC

Geology

Rock classification is based on the genetic attributes of rocks

Rock Mechanics

Rock classification is based on the behavioral attributes of rocks

Porosisty

it identifies the relative proportions of solids and voids

sonic veolocity

it evaluates the degree of fissuring

Permiability

it evaluates the relative interconnection of the pores

Durability

it indicates the tendency for eventual breakdown of components of structures, with degradation of rock quality

strenght

it determines the present competency of the rock fabric to bind the components together.

sedimentary rock

these are formed by the accumulation of grains, rock fragments, or shells

Sorting

it Indicates the degree to which the clasts in a rock are all the same size or include a variety of sizes.

cementation

it takes place during diagenesis tends to fill in the pore space.

Cubic Packing

it is unstable and tends to evolve to orthorhombic packing with compaction

greater

The higher the porosity, the __________ the fluids per unit volume.

lower

Poorly sorted sediments usually have _______ porosity because the fine-grained fragments tend to fill in the open space

higher-order conditioning

Well-rounded coarse-grained sediments usually have ______ porosity than fine-grained sediments, because the grains do not fit together well. tulane.edu

reduced

Angular grains of fine grained sediment can be compacted to fit together better, and thus porosity is _______

lower

The older the rock, the _______ the porosity and vice versa.

lower

The deeper the rock (with respect to the Earth's surface),the ________ the porosity and vice versa.

11%

34%

Cambrian sandstone Porosity is ______

Cretaceous sandstone Porosity is _____

Overburden stress or vertical stress

is the pressure exerted on a rock formation at a given depth due to the total weight of the rocks and fluids above that depth

chalk

Is among the most porous of all rocks with porosities in some instances of more than 50%

chalk

These rocks are formed of the hollow skeletons of microscope animals -coccoliths.

Boyle's Law

porosity is Measured solid volume and pore air volume using_____

pressure injector

porosity is measured with Mercury content after saturation with mercury using______

Density

is the amount of mass per unit volume of a substance

specific weight

is the amount of weight per unit volume of a substance

specific gravity

Ratio between its density and the density of water