Interaction of Piles and Raft

The piles were steel pipes that were 620 mm long and 33 mm in diameter. The piles were rigidly attached to the raft plate with bolts. The raft was a metal plate 400×400×20 mm in size. The measurements of the testing sandbox were 3500×2000×2000 mm. The test place is shown on Figure 1. The tests were carried out in fine sand the composition of which can be seen on Figure 2. Up to 80 percent of the sand was composed of fractions 0.15–0.5 mm in size. The dry density of the sand was 14 kN/m3, water content w = 4%, density Id = 0.45 and the angle of shearing resistance 35 degrees.