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.

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.
WEB LINKS:
Introduction

Session 2

LECTURE:
Concept of stress and strain in rock Analysis of stress, strain.
WEB LINKS:

stresses in rock.ppt

Session 3

LECTURE:
constitutive relations in isotropic and anisotropic rocks.
WEB LINKS:

isotropic .weblink

Session 4

PRACTICAL:
Determination of water content

WEB LINKS:
rock types.weblink

Session 5

LECTURE:
Density, unit weight and specific gravity, Moisture,content, degree of saturation, Porosity, Void ratio, Permeability.
WEB LINKS:

physico mechanical properties of rock.ppt

Session 6

LECTURE:
Velocity of elastic waves,Electrical resistivity, Thermal properties, Durability
WEB LINKS:

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
WEB LINKS:

lab testing.ppt

Session 9

LECTURE:
Rock strength and failure mode
WEB LINKS:

failure mechanics.ppt

Session 10

PRACTICAL:
Determination of unconfined compressive strength
WEB LINKS:

ucs test.ppt

Session 11

LECTURE:
Propagation of elastic wave in rock media; Determination of dynamic strength and elastic constants of rock.
WEB LINKS:

Session 12

PRACTICAL:
Determination of specific gravity of a rock specimen

Session 13

LECTURE:
Creep deformation and strength behaviour; Creep test and rheological models.
WEB LINKS:
Time -dependent properties

Session 14

LECTURE:
In situ shear tests; Evaluation of shear strength; In situ bearing strength test
WEB LINKS:

Session 15

LECTURE:
In situ deformability tests-Plate Loading Test, Plate Jacking Test and Borehole Jack Tests
WEB LINKS:

Session 16

LECTURE:
Theories of rock failure; Coulomb, Mohr and Griffith criteria; Empirical criteria.
WEB LINKS:

Session 17

PRACTICAL:
Determination of tensil strength

Session 18

LECTURE:
Introduction,TERZAGHI'S rock mass classification, Rock quality designation (RQD),Classification based on UCS.
WEB LINKS:
Rock mass classification

Session 19

LECTURE:
Geomechanics classification, Tunnelling qualityindex (Q), Rock structure rating (RSR)
WEB LINKS:

Session 20

LECTURE:
The geological strength index (GSI), Rock mass classification in support design
WEB LINKS:

Session 21

LECTURE:
Pre-mining stress sources, methods of determination including over coring, hydro-fracturing methods and other methods
WEB LINKS:

Session 22

LECTURE:
Introduction to Stress around the underground openings
WEB LINKS:

Session 23

LECTURE:
Introduction to slope failure modes,plain failure
WEB LINKS:

Session 24

LECTURE:
wedge failure,circular failure,toppling failure
WEB LINKS:

Session 25

LECTURE:
Rock slope stabilisation
WEB LINKS:

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