Table 2.

The ratio between vertical and horizontal stresses around pile base and under failure load for different effective friction angle values.

Ø′	The ratio between horizontal and vertical stresses around the pile base under failure load (K)	Passive lateral earth pressure coefficient (KP) using rankine formula	KFailure/KP
0	1.0	1.0	1.00
10	1.42	1.42	1.00
15	1.59	1.69	0.94
22.5	1.83	2.24	0.82
30	2.08	3	0.69