intact rock
DESCRIPTION
GeotechnicalTRANSCRIPT
Intact Rock
Nurul Nabila Binti Abdullah109284
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Definition
[Dictionary]
Lacking nothing especially not damaged
Intact rock contains neither joints nor hair cracks
Intact Rock vs Rock Mass The insitu rock, or rock mass, is
comprised of intact rock separated by discontinuities such as joints, bedding planes, folds, sheared zones and faults.
Significantly lower strength than intact rock.
Intact rock properties affect stress-induced modes of behavior, durability and excavation effort.
Rock mass properties greatly affected by discontinuities and weathering.
Classification
Strength Deformation
Index Test Chemical weathering
The amount of applied stress at rock failure and rupture
Usually expressed as strain, a dimensionless quantity expressing the amount of deformation in terms of the original dimensions
Alternative method by rock material strength index text has been commonly adopted.
The weathering process will change physical properties and chemical composition of the rock. The presence of discontinuities influences the strength and deformability of rock to great extend.
StrengthUniaxial compressive strength
Probably the most widely performed test on the rock to investigate uniaxial deformation and mechanical properties of rocks
Shear strength A term used to describe the strength of a
material or component against the type of yield or structural failure where the material or component fails in shear
Tensile strength/Brazilian test A method of determining the tensile strength
of concentrate using a cylinder which splits across the vertical diameter
DeformationStatic Elastic Modulus
Young Modulus The ratio of therelative contraction strain, or transverse
strain(normal to the applied load) divided by the relative extension strain, or axial strain(in direction of the applied load)
Poisson's Ratio Describes the material's response to linear strain
Deformation
Dynamic Elastic Modulus
Young ModulesPoisson's RatioShear Modulus
Describes the material's response to shearing strains
Index Test
Point load test
Used for testing rock, aggregate and core samples as well as out crop specimen in their original shape. Uniaxial compressive strength for rock specimen can also be predicted approximately
Index Test
Swiss Hammer (Schmidt Hammer)
The hammer measures the rebound of a spring loaded mass impacting against the surface of the sample
Index Test
Slake Durability Test of Rocks
Determining resistance of rocks to abrasion and
dry/wetting
Index Test
Point load test
Used for testing rock, aggregate and core samples as well as out crop specimen in their original shape. Uniaxial compressive strength for rock specimen can also be predicted approximately
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