For the piles beneath deep excavations

the distribution of pile shaft resistance is different from that under conventional condition. Based on the field tests and numerical simulation of super-long bored piles

theoretical analysis is conducted to investigate the different settlement behaviors caused by the shaft resistance distributions under both conventional and excavation conditions. The results show that due to the low tip resistance of the super-long pile under working load

the comprehensive coefficients of pile compression depend on the distributions of shaft resistance. The comprehensive coefficients of pile compression recommended in the current code are reasonable for super-long bored pile under conventional condition. However

it is found that the comprehensive coefficient of pile compression under excavation condition is 20% larger than the recommended value in the current code. Therefore

the settlement of pile may be underestimated without considering excavation effect. Furthermore

for the pile under deep excavation condition

the comprehensive coefficient of pile compression decreases with the increase of the slenderness ratio l/d; while for the pile under conventional condition

there is no direct relation between the comprehensive coefficient of pile compression and the slenderness ration.