The backfill retained by a gravity retaining wall shown in Figure P16.5 consists of two sand layers, compacted at different densities. The properties of the sand are shown in the figure. Assuming that the gravity wall does not move laterally (i.e., at-rest), determine the magnitude and location of the thrust on the wall.

Figure P16.5

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Sand 1 2 m y = 17.5 kN/m3; o' = 32° 3 m Sand 2 y = 17.5 kN/m3; o' = 36°