1. Engineering
Geology

2. Unit-I

3. Introduction
Course details
3 Hours Lecture /week with 3 Course Credits
Communication:
• Activities involve lectures, tutorials and a field practice
• Lectures - provide the theoretical background of the topics
• Tutorials - if there’s a need for additional guidance in the
preparation for assessments. Please note that You have to arrange
an appointment in due time.
• Field Practice.

4. Scope of Geology
• Geology is the science of the earth, it is not a
basic science like
mathematics, physics, chemistry or
biology, but is an application of these basic
sciences to the problems presented by the
earth.

5. Scope of Geology

6. Scope of Engineering Geology
• Engineering geology may be defined as the branch of
applied science which deals with the application of
geology for a safe and economic design and
construction of a civil engineering projects
The basic objective of engineering geology are two
fold:
• It enables a civil engineer to understand engineering
application of certain conditions related to the area of
construction, which are essentially geological in nature.
• It enables a geologists to understand the nature of
geological information that is absolutely essential for
the safe design and construction of a civil engineering
project.

7. Scope of Engineering Geology

8. Scope of Engineering Geology

9. Geology &Civil Engineering
• The scope of engineering geology is best studied with
reference to major activities of the profession of civil
engineer which are: Construction, water resource
development, town and regional planning.

10. Geology &Civil Engineering
Geology in Construction Jobs
• In all types of heavy construction jobs such as
buildings, towers, tanks, dams and
reservoir, highway bridges, traffic and
hydropower tunnels etc. full geological
information about the site of construction (or
Excavation) and about the natural materials of
construction is paramount importance.

11. Geology &Civil Engineering

12. Geology &Civil Engineering

13. Geology &Civil Engineering

14. Geology &Civil Engineering
• The aspect of geology has full relevance in all the three aspects
of each construction i.e. planning, designing and execution.
Planning
• Following geological information is greatly useful in planning
an engineering project.
• Topographical maps Such maps give details of relief features
and are essential to understand relative merit and demerit of all
the possible sites.
• Hydrological Maps. These maps give broad details about the
distribution and geometry of the surface water channels and
also the occurrence and depth contour of groundwater.
• Geological Maps. Petrological characters and structural
disposition of rock types as developed in the proposed area
depicted in geological maps.

15. Planning
Topographical maps

16. Planning
Hydrological Maps
Geological Maps

17. Planning
Hydrological Maps
Geological Maps

18. Geology &Civil Engineering
Design
• Some of the geological characters that have a direct or indirect
bearing upon the design of a proposed project are:
• (i) the existence of hard bed rocks and their depth from and
inclination.
• (ii) The mechanical properties along and across the site of the
proposed project;
• (iii) Presence, nature and distribution pattern of planes of
structural weakness
• (iv) The position of ground water table in totality.
• (v) Seismic character of the area as deciphered from the
seismic history and prediction about future seismicity.

19. Geology &Civil Engineering

20. Geology &Civil Engineering

21. Geology &Civil Engineering

22. Geology &Civil Engineering
Construction
• The engineer responsible for the quality control of
construction materials will derive enormous benefit from his
geological background of the nature material such as
sand, gravel, crushed rocks.
• Similarly for construction in geologically sensitive areas as
those of coastal belts, seismic zones and permafrost
regions, knowledge of geological history of the area is of great
importance.
• Construction of underground projects like tunnels cannot at all
be undertaken without a through knowledge of the geological
characters and setting of the rocks and their relevance to the
loads imposed.

23. Geology &Civil Engineering

24. Geology &Civil Engineering

25. Geology &Civil Engineering

26. Geology &Civil Engineering
Geology in Water Resource Development
• Exploration and development of water resources have become
very important areas of activities for scientists, technologists
and engineers in all parts of the world.
• The water resource engineers has to understand the water cycle
in all essential details. Study of water cycle is an essential
prerequisite for effective planning and execution of major
water resource development programmers on national and
regional level.

27. Geology in Water Resource Development

28. Geology in Water Resource Development

29. Geology in Water Resource Development

30. Geology &Civil Engineering
Geology in Town and Regional Planning
• A town planner is concerned essential with land utilization in
as best and as aesthetics a manner as possible for developing
cities and towns for meetings social needs in different areas.
• The regional Town Planner is responsible for adopting an
integrated approach in all such cases of allocation of land for
developmental projects.
• Thus a change induced in the natural setup of an area due to a
proposed new project is going to lead a series of changes in the
adjoining and even in distant places. In nature, nothing works
in isolation. As such all sound planning must be in tune with
the natural features and processes of a region.

31. Geology in Town and Regional Planning

32. Geology in Town and Regional Planning

33. Brief History of Formation of Earth
and Earth Crust

34. Brief History of Formation of Earth and
Earth Crust
• According to currently held views of the earth, the planets
of the solar system originated from a hot gas and dust cloud
probably formed by a supernova explosion.
• The dust particles are considered to have aggregated into
clumps of materials that grew into our prismoidal planets.
• In the early phases, when the cloud-called solar nebulas-was
very hot, mainly iron rich compounds accumulated into
protoplanets to form what would become the iron rich
planetary cores, while low density silicate minerals of the
outer parts were formed at a later stage lower temperatures.
This gave the present radial segregation into distinct
chemical zones.

35. Formation of Earth and Earth
Crust

36. Earth and Earth Crust

37. Earth and Earth Crust

38. Formation of Earth and Earth Crust
• The earth began to cool by loss of heat of radiations, and when
it had cooled sufficiently, by the consolidation of molten earth
material, and outer crust of solid material was formed. These
solids building up the earth are called rocks.
• Thus the first rock to be formed on the earth were formed by
the cooling and consolidation of molten rock material. They
belong to important class of rock igneous rocks because of the
high temperature of their formation.

39. Brief History of Formation of Earth and
Earth Crust

40. Formation of Earth and Earth
Crust

41. Brief History of Formation of Earth
and Earth Crust

42. Brief History of Formation of Earth
and Earth Crust

43. Formation of Earth and Earth Crust
• The earth began to cool by loss of heat of radiations, and when
it had cooled sufficiently, by the consolidation of molten earth
material, and outer crust of solid material was formed. These
solids building up the earth are called rocks.
• Thus the first rock to be formed on the earth were formed by
the cooling and consolidation of molten rock material. They
belong to important class of rock igneous rocks because of the
high temperature of their formation.

44. Formation of Earth and Earth
Crust

45. Brief History of Formation of Earth and
Earth Crust
• When the first rocks of the solid crust were formed.
Obviously no water could exist on the earth in the
liquid form at this stage, all of it being held in the
atmosphere in the form of vapor.
• As the earth cooled down to below boiling point of
vapor began to condense and the first rain fell. The
water accumulated in the hollows and depressessions
of the land surface forming the first oceans, and
gradually a system of river, lakes , oceans etc were
established.

46. Brief History of Formation of Earth and
Earth Crust
• Water, as soon as it appeared in the liquid state, began to attack the
first formed rocks with the help of the atmosphere as a result
causing consequent decay of rocks called rock weathering.
• All these products of the decay of land are carried by running
water, and are ultimately dumped on the ocean bottom and
accumulated there for ages forming thick layer of new rocks.
• The newely formed rocks, as soon as they emerge from the
sea, come under the attack of water and atmosphere, and the newely
formed ocean starts receiving material derived from the decay of the
rock land.
• The rocks formed by the deposition of rock waste on ocean are
called ‘sedimentary rocks’ and as a result of number of such
sedimentary cycles vast piles of sedimentary rocks have
accumulated in different parts of the earth in different geological
period.

47. Sedimentary
rocks
Metamorphic
rocks
Plutons
Desert
Playa
lake
Delta
Glacier
The Sedimentary Stages of the Rock Cycle
Weathering
breaks down
rocks.
Erosion carries
away particles.
Transportation moves particles
downhill.
Deposition occurs when
particles
settle out or precipitate.
Diagenesis lithifies
the sediment to make
sedimentary rocks.
Burial occurs
as layers of
sediment
accumulate.

48. Sedimentary Rocks

49. Brief History of Formation of Earth and
Earth Crust
• The Internal Processes The period of uplift of sedimentary
rocks are period of great crustal instability. The internal forces
that develop give rise to tectonic earth movements by the
sediments are folded into high mountains like himalayas and
alps.
• Large quantities of molten rock material called
magma, formed by the melting of crustal rocks, are outpoured
on the surface through volcanoes as lava. The forces which
bring about tectonic earth movements are also responsible for
giving rise to the third type of rocks the ‘metamorphic rocks’.

50. Metamorphic Rocks

51. Brief History of Formation of Earth and
Earth Crust
• Thus by the operation of different geological
processes different types of rocks are formed, each
having different characteristics depending on the
mode of formation. To understand the geological
processes, therefore, the characteristics of rocks
resulting by their operation have to be studied.

52. Brief History of Formation of Earth and
Earth Crust

53. Formation of Earth and Earth
Crust

54. Formation of Earth and Earth
Crust

55. Formation of Earth and Earth
Crust

56. Thanks……….