1.A certain element of soil is subject to a mean normal stress of 420 kpa and a deviator stress of 280 kpa. The major principal plane is rotated 30 degrees counterclockwise from horizontal. Draw the Mohr circle for this soils element, locate the pole and compute the normal and shear forces acting on horizontal and vertical planes.
2.Calculate the hydraulic radius an equilateral triangle channel running with a flow width of w.