Engineering :: Soil Mechanics and Foundations

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141.

The critical gradient for all soils is normally

A.	0.5	B.	1
C.	1.5	D.	2.5

142.

The maximum permissible exit gradient is the critical gradient divided by a factor of safety.

True

False

143.

The permissible exit gradient for safety against piping which endanger the stability of a hydraulic structure, should be

A.	0.2	B.	0.4
C.	0.6	D.	0.8

144.

The piping failure in a hydraulic structure can be prevented by

A.	diverting the seepage water into filter wells	B.	increasing the creep length of flow of water
C.	increasing the stress due to weight of the structure	D.	all of the above

145.

The effective stress on the soil is due to the

A.	external load acting on the soil	B.	weight of the soil particles
C.	weight of water present in soil pores	D.	both (a) and (b)

146.

The neutral stress on the soil is due to the

A.	external load acting on the soil	B.	weight of the soil particles
C.	weight of water present in soil pores	D.	both (a) and (b)

147.

The effective stress is also called pore-water pressure.

Agree

Disagree

148.

The effective stress on the soil mass

increases

decreases

149.

The neutral stress is

A.	transmitted through the points of contact of the interconnected particles of soil.	B.	transmitted to the soil base through the pore water
C.	independent of the depth of water above the soil mass	D.	due to weight of soil particles

150.

Which of the following statement is wrong?

A.	The neutral stress does not change the shearing resistance of the soil.	B.	The decrease in effective stress is accompanied by increase in the neutral stress.
C.	The neutral stress does not decrease the void ratio.	D.	none of the above