1.1 introduction of geology,Branches and Scope of Geology

DEPARTMENT OF CIVIL
ENGINEERING
Branches and Scope of
Geology
Er. Ramprasad Kumawat
(M.Tech)

INTRODUCTION TO GEOLOGY
Geology (in Greek, Geo means Earth, Logos
means Science) is a branch of science dealing
with the study of the Earth. It is also known as
earth science. The study of the earth comprises
of the whole earth, its origin, structure,
composition and history (including the
development of life) and the nature of the
processes.

• Geology is a fascinating subject.
• Geology feels the pulse of the earth.
• Geologists contribute their part to the nation
through the discovery of new deposits of rocks
and minerals of economic value

DIFFERENT BRANCHES OF
GEOLOGY
• (i) Physical Geology (ix) Economic Geology
• (ii) Crystallography (x) Mining Geology
• (iii) Mineralogy (xi) Civil Engg.Geology
• (iv) Petrology (xii) Hydrology
• (v) Structural Geology (xiii) Indian Geology
• (vi) Stratigraphy (xiv) Resources Engg.
• (vii) Paleontology (xv) Photo Geology
• (viii) Historical Geology

(i) Physical Geology
• As a branch of geology, it deals with the “various
processes of physical agents such as wind, water,
glaciers and sea waves”, run on these agents go on
modifying the surface of the earth continuously.
• Physical geology includes the study of Erosion,
Transportation and Deposition (ETD).
• The study of physical geology plays a vital role in civil
engineering thus:
• (a) It reveals constructive and destructive processes of
physical agents at a particular site.
• (b) It helps in selecting a suitable site for different types
of project to be under taken after studying the effects of
physical agents which go on modifying the surface of
the earth physically, chemically and mechanically.

(ii) Crystallography
• As a branch of geology, it deals with ‘the study
of crystals’. A crystal is a regular polyhedral
form bounded by smooth surfaces.
• The study of crystallography is not much
important to civil engineering, but to recognize
the minerals the study of crystallography is
necessary.

(iii) Mineralogy
• As a branch of geology, it deals with ‘the study of
minerals’. A mineral may be defined as a naturally
occurring, homogeneous solid, inorganically
formed, having a definite chemical composition
and ordered atomic arrangement.
• The study of mineralogy is most important.
(a) For a civil engineering student to identify the
rocks.
(b) In industries such as cement, iron and steel,
fertilizers, glass industry and so on.
(c) In the production of atomic energy.

(iv) Petrology
• As a branch of geology it deals with ‘the study
of rocks’. A rock is defined as “the aggregation
of minerals found in the earth’s crust”.
• The study of petrology is most important for a
civil engineer, in the selection of suitable rocks
for building stones, road metals, etc.

(v) Structural Geology
of structures found in rocks’. It is also known
as tectonic geology or simply tectonics.
• Structural geology is an arrangement of rocks
and plays an important role in civil
engineering in the selection of suitable sites for
all types of projects such as dams, tunnels,
multistoried buildings, etc.

(vi) Stratigraphy
• As a branch of geology it deals with ‘the study
of stratified rocks and their correlation’.
(vii) Paleontology
of fossils’ and the ancient remains of plants
and animals are referred to as fossils. Fossils
are useful in the study of evolution and
migration of animals and plants through ages,
ancient geography and climate of an area.

(viii) Historical Geology
• As a branch of geology, it includes “the study
of both stratigraphy and paleontology”. Its use
in civil engineering is to know about the land
and seas, the climate and the life of early times
upon the earth.
(ix) Economic Geology
• As a branch of Geology, it deals with “the
study of minerals, rocks and materials of
economic importance like coal and
petroleum”.

(x) Mining Geology
• As a branch of geology, it deals with “the study of
application of geology to mining engineering in
such a way that the selection of suitable sites for
quarrying and mines can be determined”.
(xi) Civil Engineering Geology
• As a branch of geology, it deals with “all the
geological problems that arise in the field of civil
engineering along with suitable treatments”. Thus,
it includes the construction of dams, tunnels,
mountain roads, building stones and road metals.

(xii) Hydrology
• As a branch of geology, it deals with “the studies
of both quality and quantity of water that are
present in the rocks in different
states”(Conditions). Moreover, it includes:
(a) Atmospheric water,
(b) Surface water, and
(c) Underground water.
(xiii) Indian Geology
• As a branch of geology, it deals with “the study of
our motherland in connection with the
coal/petroleum, physoigraphy, stratigraphy and
economic mineral of India”.

(xiv) Resources Engineering
• As a branch of geology deals with “the study
of water, land, solar energy, minerals, forests,
etc. fulfill the human wants”.
(xv) Photo Geology
• As a branch of geology deals with “the study
of aerial photographs”.

IMPORTANCE OF GEOLOGY FOR
CIVIL ENGINEERING
• The role of geology in civil engineering may be briefly
outlined as follows:
1. Geology provides a systematic knowledge of
construction materials, their structure and properties.
2. The knowledge of Erosion, Transportation and
Deposition (ETD) by surface water helps in soil
conservation, river control, coastal and harbour works.
3. The knowledge about the nature of the rocks is very
necessary in tunneling, constructing roads and in
determining the stability of cuts and slopes. Thus,
geology helps in civil engineering.
4. The foundation problems of dams, bridges and
buildings are directly related with geology of the area
where they are to be built.

5. The knowledge of ground water is necessary
in connection with excavation works, water
supply, irrigation and many other purposes.
6.Geological maps and sections help
considerably in planning many engineering
projects.
7. If the geological features like faults, joints,
beds, folds, solution channels are found, they
have to be suitably treated. Hence, the stability
of the structure is greatly increased.
8. Pre-geological survey of the area concerned
reduces the cost of engineering work.

SCOPE OF GEOLOGY
• Engineering Geology: A well established
interdisciplinary branch of Science and
Engineering has a scope in different fields as
outlined below:
(a) In Civil Engineering
(b) In Mining Engineering
(c) In Ground Water
(d) Land pollution.
(e) Nuclear explosion.
(f) Oceanography.
(g) Space exploration.

• (a) In Civil Engineering: Geology provides
necessary information about the site of
construction materials used in the construction
of buildings, dams, tunnels, tanks, reservoirs,
highways and bridges. Geological information
is most important in planning phase (stage),
design phase and construction phase of an
engineering project.

• (b) In Mining Engineering: Geology is useful to
know the method of mining of rock and mineral
deposits on earth’s surface and subsurface.
• (c) In Ground Water: Resources development
geology is applied in various aspects of resources
and supply, storage, filling up of reservoirs,
pollution disposal and contaminated water
disposal.

1.1 introduction of geology,Branches and Scope of Geology

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