In upgradation and reconstruction of the block wharf,new challenges are proposed in calculating the pressure of the newly added backfill soil in front of the original block.Taking the upgradation and reconstruction project of a block wharf in Nigeria as an example,we explore the calculation mode of using the backfill sand soil pressure in front of the original block wharf as silo pressure,and compare and analyze the calculation mode of silo pressure in Chinese standard,European standard,and OCDI specification,and the calculation mode of soil pressure in Chinese standard.The results show that the results of silo pressure calculation model are greater than those of the soil pressure calculation model.Silo pressure modes in the Chinese and European standards are similar,and the results are basically consistent.The calculation model of OCDI specification is simple,and the calculation results are larger.Based on Plaxis 2D finite element calculation software,the results are between OCDI specification,the Chinese and European standards,but there is less difference with the Chinese and European standards.It is believed that the calculation modes in Chinese and European standards are more reasonable.