Rock Mechanics
Teacher
Arun Kumar Sahoo
Category
Core Courses
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Course Name : ROCK MECHANICS
Code(Credit) : CUTM1106 (2-1-0)
Course Objectives
- Develop an understanding of the engineering properties of rocks, geological and engineering rock classifications
- Understand rock failure theories
- Learn about in-situ stresses in rock
- Know about the fundamental concepts and principles of rock mechanics.
- Understand rock failure theories
Course Outcomes
CO1 Explain physical, mechanical properties and time dependant properties of rock mass and different test for measuring rock strength PO1 (2), PO4(1)
CO2 Discuss the various failure mode analysis PO1(2), PO4(1)
CO3 Explain different types of rock mass classification systems and stress calculations of underground openings PO1 (2), PO6(1),PO7(1)
Course Syllabus
MODULE I
Rock Mechanics(5 HOURS):
Definition, history, source of information and field of application of rock mechanics.Concept of stress and strain in rock Analysis of stress, strain and constitutive relations in isotropic and anisotropic rocks.
Physico-mechanical properties of rock(8 HOURS):
Physical Properties: Density, unit weight and specific gravity, Moisture,content, degree of saturation, Porosity, Void ratio, Permeability, Velocity of elastic waves,Electrical resistivity, Thermal properties, Durability
PRACTICAL:
Determination of water content and unit weight and specific gravity
Mechanical Properties:
Uniaxial compressive strength, Tensile strength, Point load strength, Triaxial strength, Direct shear strength
Rock strength and failure mode
PRACTICAL:
Determination of unconfined compressive and tensile strength
MODULE II
Dynamic properties of rock and rockmass(3 HOURS):
Propagation of elastic wave in rock media; Determination of dynamic strength and elastic constants of rock.
Time dependent properties of rock(4 HOURS):
Creep deformation and strength behaviour; Creep test and rheological models. Strength and Deformability of Rock Mass: In situ shear tests; Evaluation of shear strength; In situ bearing strength test; In situ deformability tests-Plate Loading Test, Plate Jacking Test and Borehole Jack Tests
MODULE III
Failure criteria for rock and rockmass(4 HOURS):
Theories of rock failure; Coulomb, Mohr and Griffith criteria; Empirical criteria.
Rock mass classification(5 HOURS)
Introduction,TERZAGHI'S rock mass classification, Rock quality designation (RQD),Classification based on UCS, Geomechanics classification, Tunnelling qualityindex (Q), Rock structure rating (RSR), The geological strength index (GSI), Rock mass classification in support design
MODULE IV
Pre-mining state of stress( 1 HOUR):
Sources, methods of determination including over coring, hydro-fracturing methods and other methods.
Stresses around underground openings(4 HOURS)
Introduction, Stress around the underground openings
Rock slope stability(5 HOURS)
Introduction- failure modes,plain failure,wedge failure,circular failure,toppling failure
Rock slope stabilisation
REFERENCES
Fundamentals and applications of rock mechanics By Debashis Deb
Elements of mining technology By D.J.Deshmukh
Rock mechanics for Engineers by B.P.Verma
Engineering Rock Mechanics By John A. Hudson
Session Plan
Session 1
LECTURE:
Definition, history, source of information and field of application of rock mechanics.
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Introduction
Session 2
LECTURE:
Concept of stress and strain in rock Analysis of stress, strain.
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Session 3
LECTURE:
constitutive relations in isotropic and anisotropic rocks.
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Session 5
LECTURE:
Density, unit weight and specific gravity, Moisture,content, degree of saturation, Porosity, Void ratio, Permeability.
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Session 6
LECTURE:
Velocity of elastic waves,Electrical resistivity, Thermal properties, Durability
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Session 7
PRACTICAL:
Determination of unit weight of a rock specimen
Session 8
LECTURE:
Uniaxial compressive strength, Tensile strength, Point load strength, Triaxial strength, Direct shear strength
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Session 11
LECTURE:
Propagation of elastic wave in rock media; Determination of dynamic strength and elastic constants of rock.
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Session 12
PRACTICAL:
Determination of specific gravity of a rock specimen
Session 13
LECTURE:
Creep deformation and strength behaviour; Creep test and rheological models.
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Time -dependent properties
Session 14
LECTURE:
In situ shear tests; Evaluation of shear strength; In situ bearing strength test
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Session 15
LECTURE:
In situ deformability tests-Plate Loading Test, Plate Jacking Test and Borehole Jack Tests
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Session 16
LECTURE:
Theories of rock failure; Coulomb, Mohr and Griffith criteria; Empirical criteria.
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Session 17
PRACTICAL:
Determination of tensil strength
Session 18
LECTURE:
Introduction,TERZAGHI'S rock mass classification, Rock quality designation (RQD),Classification based on UCS.
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Rock mass classification
Session 19
LECTURE:
Geomechanics classification, Tunnelling qualityindex (Q), Rock structure rating (RSR)
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Session 20
LECTURE:
The geological strength index (GSI), Rock mass classification in support design
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Session 21
LECTURE:
Pre-mining stress sources, methods of determination including over coring, hydro-fracturing methods and other methods
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Session 22
LECTURE:
Introduction to Stress around the underground openings
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Session 23
LECTURE:
Introduction to slope failure modes,plain failure
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Session 24
LECTURE:
wedge failure,circular failure,toppling failure
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Session 25
LECTURE:
Rock slope stabilisation
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