Soil Mechanics Exam 2 with Complete
Solutions
T/F: Hydraulic gradient, i, is defined as the energy or head loss, h, per unit length, l. Correct
Ans-True
T/F: Seepage velocity, the actual velocity of the water flowing in the voids, is greater than the
discharge, or superficial, velocity and is related by porosity. Correct Ans-True
Hydraulic conductivity, or permeability, depends on the following: Correct Ans-Degree of Soil
Saturation
Void Ratio
Grain size distribution
Pore size distribution
T/F: There is a direct relationship between porosity and hydraulic conductivity. Correct Ans-
False
T/F: Liquefaction, or quicksand, occurs when the effective stress is less than zero. Correct
Ans-False
T/F: Seepage forces, which may cause quicksand to develop, are always present in soils where
there is a gradient causing the flow of water. Correct Ans-True
Solutions
T/F: Hydraulic gradient, i, is defined as the energy or head loss, h, per unit length, l. Correct
Ans-True
T/F: Seepage velocity, the actual velocity of the water flowing in the voids, is greater than the
discharge, or superficial, velocity and is related by porosity. Correct Ans-True
Hydraulic conductivity, or permeability, depends on the following: Correct Ans-Degree of Soil
Saturation
Void Ratio
Grain size distribution
Pore size distribution
T/F: There is a direct relationship between porosity and hydraulic conductivity. Correct Ans-
False
T/F: Liquefaction, or quicksand, occurs when the effective stress is less than zero. Correct
Ans-False
T/F: Seepage forces, which may cause quicksand to develop, are always present in soils where
there is a gradient causing the flow of water. Correct Ans-True
