Table 4: Static load test parameters and fitting parameters of PHC pipe pile

Compression pile	S1	S4	S5	S7	S8	S9
Pile diameter/mm	400	400	400	500	500	500
Ultimate bearing capacity /kN	1750	2200	2250	2400	2700	2700
αpc	0.640	0.549	0.329	0.412	0.509	0.509
A1	0.4060	0.278	-0.026	0.087	0.222	0.222
p	-1.255884	-1.3627	-1.5531	1.486	-1.4026	-1.4026
Uplft pile	S2	S3	S6	S10	S11	S12
Pile diameter/mm	400	400	400	500	500	500
Ultimate bearing capacity /kN	540	550	540	720	720	720
αpu	0.050	0.065	0.058	0.055	0.063	0062
αpc / αpu	12.80	8.45	5.67	7.49	8.08	8.21
A1	-0.404	-0.383	-0.393	-0.396	-0.387	-0.387
p	-1.7237	-1.7155	-1.719	-1.7206	-1.717	-1.717