Question

A slope on the side of a hill is cut to make space for a wider sidewalk. The soil behind the slope will be supported with a concrete block that will rest on a highly plastic clay. Slope Concrete Side walk block Figure 1.Scheme of the problem Assuming a 2D problem, the geometry of the block is: height (H) 5 ft and width (W)-8 ft. Consider the depth as a unity. A direct shear test is conducted on the clay below the block and the following results were obtained as in the table Table 1. Data from direct shear test Normal Stress (pst Shear Strength (pst 250 500 1000 590 680 860 (a) Estimate the cohesion intercept (c) and the friction angle (v) for the effective stress failure envelope (b) Calculate the shear strength of the clay at the foot of the concrete block, assuming the unit weight of the concrete is 150 pcf and that the ground behind the concrete applies only a horizontal force on the block

Answer 1

asd 2 SO i590 68o 860

Selher

Pst Soot-150如り(19.8) 1、S = 다가ops