The gravity of the pile and the supporting force of the ground are a pair of balanced forces. If f is along the diagonal line perpendicular to the two bottom surfaces of the cylinder, the arm of force L=0.8 square +0.6 square, and then the root is found, L= 1m, taking the left point at the bottom of the cylinder as the origin O, according to the balance condition of the lever, FXL = GXr；; f = GXr/L = 1 100 x 0.3/ 1 = 330n