SOIL MECH T1

Question 1

In Geotechnical Engineering, this refers to a particle that
consists of three phase solid, liquid (water) and gas (air).

Answer 1

soil

Question 2

soil refers to a particle that
consists of three phase solid, liquid (water) and gas (air).

Answer 2

geotechnical engineering

Question 3

refers to a collection of solid particles, of varying sizes, with voids in between which may
contain water.

Answer 3

soil by civil engineers

Question 4

soil is formed by different particles such as

Answer 4

1. gravel
2. rock
3. sand
4. silt
5. clay
6. loam
7. humus

Question 5

is the sub discipline of civil engineering that involves natural materials found close to the surface of the earth.

Answer 5

geotechnical engineering

Question 6

defined as a natural aggregate of mineral grains, with or without organic constituents that can be separated by gentle mechanical means such as agitation in water.

Answer 6

soil

Question 7

is considered to be a natural aggregate of mineral grains
connected by strong and permanent cohesive forces.

Answer 7

rock

Question 8

are formed by the process of weathering of the parent rock.

Answer 8

soil

Question 9

types of weathering

Answer 9

1. mechanical weathering/mechanical disintegration
2. chemical weathering/chemical decomposition

Question 10

is due to the action of such agents as the expansive forces of
freezing water in fissures, due to sudden changes of temperature or due to the abrasion of rock by moving water or glaciers.

Answer 10

mechanical weathering

Question 11

can transform hard rock minerals into soft, easily erodible matter.

Answer 11

Chemical weathering (decomposition)

Question 12

Principle types of decomposition

Answer 12

1. Hydration
2. oxidation
3. carbonation
4. desilication
5. leaching

Question 13

Three basic types of soils

Answer 13

1. sand
2. silt
3. clay

Question 14

classification of soil according to grain size acc. to USCS

Answer 14

1. gravel: 4.75 to 76.2 mm
2. sand: less than 4.75 to 0.075 mm
3. silt: 0.075 to 0.002 mm
4. clay: finer than 0.002 mm

Question 15

are mixtures in which a significant part of the solids is derived from the growth and decay of plant life and/or from the accumulation of skeletons or shells of small organisms.

Answer 15

organic soils

Question 16

is a good example of an organic soil, consisting largely of decaying wood and other plant remains.

Answer 16

peat

Question 17

are formed as a result of the breaking down of rocks into smaller fragments.

Answer 17

inorganic soils

Question 18

purely mechanical process

Answer 18

physical weathering (disintegration)

Question 19

chemical alteration of the parent material

Answer 19

chemical decomposition

Question 20

is the material resulting from the in situ weathering of the parent rock.

Answer 20

residual soil

Question 21

Residual soils are distributed throughout many regions of the world, such as

Answer 21

Africa, South Asia, Australia, Southeastern North America, Central and South America, and considerable regions of Europe.

Question 22

are soils that are found at locations far removed from their place of formation.

Answer 22

transported soils

Question 23

the transporting agencies of soils

Answer 23

glaciers, wind, water

Question 24

transported by running water and deposited along streams and so-called alluvial plains

Answer 24

Alluvial Soils

Question 25

transported and deposited by wind. Examples: Sand dunes, air transported volcanic deposits, Loess.

Answer 25

Aeolian Soils

Question 26

formed by movement of soils from its original place by gravity, such as during landslides.

Answer 26

Colluvial Soils

Question 27

formed by deposition in quiet lakes.

Answer 27

Lacustrine Soils

Question 28

formed by transportation and deposition of glaciers.

Answer 28

Glacial Soils

Question 29

formed by deposition in the seas.

Answer 29

Marine Soils

Question 30

is generally understood to refer to a material composed of a mass of small mineral particles which, in association with certain quantities of water, exhibits the property of plasticity.

Answer 30

clay

Question 31

extremely small crystalline particles of one or more members of a small group of minerals

Answer 31

clay minerals

Question 32

Clay is divided into three general groups based on

Answer 32

Crystalline arrangement