Engineering Geology

Question 1

GW

Answer 1

Well-graded gravels, gravel sand mixtures,

Question 2

GP

Answer 2

Poorly graded gravels

Question 3

GM

Answer 3

Silty gravels

Question 4

GC

Answer 4

Clayey gravels

Question 5

SW

Answer 5

Well-graded sands

Question 6

SP

Answer 6

Poorly graded sands

Question 7

SM

Answer 7

Silty sands

Question 8

SC

Answer 8

Clayey-sands

Question 9

ML

Answer 9

Low plasticity silts

Question 10

CL

Answer 10

Low plasticity clays

Question 11

OL

Answer 11

Low plasticity organics

Question 12

MH

Answer 12

High plasticity silts

Question 13

CH

Answer 13

High plasticity clay

Question 14

OH

Answer 14

Organic high plasticity silts & clays

Question 15

PT

Answer 15

Peat or highly organic soils

Question 16

A-line

Answer 16

line on the plasticity chart that divides clays from silts

Question 17

Atterberg Limits Test

Answer 17

Lab test to determine Water content at the boundary between states of soil consistency

Question 18

Effective stress

Answer 18

= total stress - pore-water pressure

Question 19

Mohr Circle

Answer 19

Graphical representation of the state of stress (normal and shear) on a particular plane inclined at an angle to the major principal stress

Question 20

Mohr-Coulomb equation

Answer 20

An equation that describes the failure of a material in shear fracture. The rupture line in a mohr circle can be approximated using this equation. τ = c + (σ . Tan φ) (1)

Question 21

Plasticity Index

Answer 21

Difference between the liquid limit and the plastic limit: PI=LL-PL