An infinitely long slope is made up of a c- soil having the properties: cohesion (c) = 20 kPa, and dry unit weight ( d) = 16 kN/m3. The angle of inclination and critical height of the slope are 40 and 5 m, respectively. To maintain the limiting equilibrium, the angle of internal friction of the soil (in degrees) is __________________

An infinitely long slope is made up of a c- soil having the propertie

1.	An infinitely long slope is made up of a c- soil having the properties: cohesion (c) = 20 kPa, and dry unit weight ( d) = 16 kN/m3. The angle of inclination and critical height of the slope are 40 and 5 m, respectively. To maintain the limiting equilibrium, the angle of internal friction of the soil (in degrees) is __________________
A.	21 to 23
B.	31 to 33
C.	41 to 43
D.	11 to 13
Answer» B. 31 to 33

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