CELEC5 MOD2

The intact rock itself is homogenous, isotropic, and elastic material.

• TRUE

• FALSE

In rotary drilling, the following is observed:

a.) A sharp rotating drill bit is advanced into the ground

b.) The drill exerts an upward pressure

c.) The drill bit is repeatedly hammered into the rock

d.) The drill exerts a downward pressure *Which of the following is true?

• a, c, and d

• a, b, and c

• c and d

• a and d

Rock specimens are recovered through sampling.

• TRUE

• FALSE

Identify whether the given statement is true or False. The engineering performance of a rock mass under external loadings is very often governed by the strength and orientation of the continuities rather than the properties of the rock mass.

• TRUE

• FALSE

In this way of drilling the drill bit is repeatedly hammered into the rock.

• Rotary Drilling

• Percussion Drilling

• Wire Line Drilling

• Mechanical Drilling

It is an unjointed piece of rock.

• Metamorphic Rock

• Sedimentary Rock

• Intact Rock

• Igneous Rock

_________ is defined as the slope of a tangent to the stress–strain plot.

• Tangent Modulus

• Secant Modulus

• Average Modulus

• None of the above

Which of the following terms refers to the vertical normal stress on a specimen when failure occurs,

• Axial pressure

• Lateral stress

• Unconfined Compressive Strength

• uniaxial compressive strength

It is a measure of the rock stiffness, which is required in modelling the rock and for computing deformations, where the rock is assumed to be an elastic continuum.

• Stress-strain diagram

• Uniaxial Compressive Strength Test

• Young’s Modulus

• Core Recovery Ratio

_________ is defined as the slope of a line joining a point on the stress-strain plot to the center.

• Tangent Modulus

• Secant Modulus

• Average Modulus

• None of the above