Engineering Rock Mechanics

Symbols used in this book xv

Symbol Quantity Nameof SIunit Dimensions
SI unit of unit

(Y angle, specifically dip radian, rad;
direction of a plane or degree, deg
trend of a line
B angle, specifically dip radian, rad;
angle of a plane or plunge degree, deg
of a line
BW orientation angle of plane radian, rad;
of weakness degree, deg
Y shear strain 1 LO
Y unit weight kg s-~ m-2 L-~MT-~

ax' ay' az
Al, Sx, Sy, Sz increment of distance, m L

--- a a a partial differential operator

displacement

linear strain

angle

fracture frequency

Poisson's ratio

kinematic viscosity

density

stress tensor

normal stress

principal stress

uniaxial compressive

strength

principal horizontal stress

uniaxial tensile strength

variance

shear stress

angle of friction

friction angle of plane of

weakness

area

cohesion

hydraulic conductivity of a

fracture

Young's modulus

fracture aperture

elastic modulus of rock

mass

force

shear modulus

shear modulus of rock

mass

geological strength index

value

hydraulic gradient

asperity angle

stress invariants

constant of proportionality

number of events

coeffiaent of permeability

radian, rad;

degree, deg

pascal, Pa

pascal, Pa

pascal, Pa

pascal, Pa

pascal, Pa

pascal, Pa

pascal, Pa

radian, rad;

degree, deg

radian, rad;

degree, deg

pascal, Pa

pascal, Pa

pascal, Pa

newton, N

pascal, Pa

pascal, Pa

1 LO

1

m-' L-'

1 -

m2 s-I L~T-~

kg m-3 L-3M

N m-2, m-l kg s-~ L-'MY

N m-2, m-I kg s-~ L-'MT-

N m-2, m-I kg s-' L-'MY

N m-2, kg s-~ L-' m-

N m-2, m-' kg ss2 L-' MT-

N m-2, m-I kg s-* L-1MT-

N m-2, m-I kg s-~ L-LMT-

m2 L

N m-2, m-I kg

m L T-I

L-' MT-~

radian, rad;

degree, deg

m2 L*