For a homogenous half space subjected to two circular loads shown below, it is the pavement structure for full depth asphalt road segment. For the specific point A which is located at the center of left wheel at a depth of 30cm determine, use Foster and Ahlvin. a) The vertical stress, b) Shear stress, c) Radial stress. d) Tangential stress 2. For the three-layer system shown in the figure below with a= 120mm, q= 800Kpa, h1= 200mm, h2 = 100mm, E1 = 3Gpa, E2 = 150Mpa, and E3 = 75Mpa, determine all the stresses and strains at the two interfaces on the axis of symmetry.

30cm 30cm 45cm
400KPa
E= 3.5GPa , ν =0.5