Lesson 2: Planning for Earthworks

Question 1

Defined in general terms as the naturally occurring, unconsolidated, mineral or organic mineral at the earth’s surface that is capable of supporting plant growth.

Answer 1

SOIL

Question 2

Soils are classified by:

Answer 2

PARTICLE SIZE

PHYSICAL PROPERTIES

MOISTURE CONTENT

Question 3

A measure of the distribution of particle size.

Answer 3

PARTICLE SIZE - GRADATION

WELL - GRADED ( particles of all sizes)

UNIFORM -GRADED (particles of same size)

Question 4

Physical properties of soil

Answer 4

SOIL TEXTURE

SOIL POROSITY

SOIL COLOR

CHEMICAL PROPERTIES

BIOLOGICAL PROPERTIES

Question 5

A major component for plant growth.

Answer 5

MOISTURE CONTENT

Question 6

In construction, engineers are looking for the optimum of it needed to achieve required densities.

Answer 6

MOISTURE CONTENT

Question 7

A branch of civil engineering concerned with the engineering behavior of earth materials. It uses the principles of soil mechanics and rock mechanics for the solution of its respective engineering problems.

Answer 7

GEOTECHNICAL ENGINEERING

Question 8

Main factors that Geotechnical Engineers looking at the science of the earth.

Answer 8

STRUCTURAL CAPACITY

DRAINAGE PROPERTIES

MIX DESIGN CHARACTERISTICS

Question 9

Gravel size classification

Answer 9

2MM TO 75MM

Question 10

Sand size classification

Answer 10

0.05MM TO 2MM

Question 11

Silt size classification

Answer 11

0.002MM TO 0.05MM

Question 12

Clay size classification

Answer 12

less than 0.002MM

Question 13

Typical Construction Soil Classifications:

Answer 13

SAND:

SAND - 1/4” TO #200

SILTS - #200 TO #600

CLAYS - UNDER #600

ROCK:

BOULDERS OVER 36”

COBBLES 3” TO 36”

GRAVEL 1/4” TO 3”

Question 14

Properties of soil

Answer 14

AIR - 20-30%

MINERAL - 45%

WATER - 20-30%

ORGANIC - 5%