In order to understand the variation law of pore water pressure and soil pressure around the pile during pile sinking in the water-rich and weak stratum,and then to guide the on-site construction,we carry out the on-site monitoring and analysis of soil pressure and pore water pressure during pile sinking.The results show that the pore water pressure and soil pressure of the piles increase significantly during pile sinking;the pore pressure ratio exceeds 60%,and the highest reaches 88%,which easily causes the effective stress loss at the pile circumference and reduces the stability of the pile body;the influence of the soil pressure around the pile is wide.The effect range of the project is 20 times the pile width in the horizontal direction.The influence range of pore water pressure is 30 times the pile width in the depth direction.The influence increases sharply while the range is within 10 times the pile width.The pore water pressure and soil pressure could dissipate 48% after 7 days.During the on-site construction,the effects of pile-soil compaction and pore pressure could be reduced by controlling the rate of pile sinking and changing the order of pile driving.