Study on the influence of pile sinking speed on pile sinking characteristics and bearing characteristics of sandy soil foundation

Static piles are widely used in practical engineering due to their safety, environmental protection and high efficiency. In the penetration stage and static load stage, the static pile will affect the stress, strain, pile sinking characteristics and bearing characteristics of the soil around the pile, and it is of practical value to study the bearing characteristics of the pile in the sinking stage and the static load connection stage of the static pile. Based on the indoor model test, the pile pressing force, end resistance, and side friction resistance of the static pile in the penetration stage and the ultimate bearing capacity, end resistance, and side friction resistance of the pile in the static load stage are analyzed. By controlling the consolidation degree of sand soil foundation and the settlement rate of pile, the influence of it on the pile sinking stage and static load stage was discussed. The test results show that the resistance at the end of the pile always accounts for more than 85% of the total resistance, and the bearing characteristics of the end-bearing pile are reflected in the sand hydrostatic pile. In the penetration stage of pile, the pile pressing force and end resistance are positively correlated with the degree of consolidation, and negatively correlated with the penetration rate. The lateral friction resistance is positively correlated with the degree of consolidation and negatively correlated with the pile sinking rate. In the static load stage, the pile pressing force and end resistance are positively correlated with the degree of consolidation, and negatively correlated with the penetration rate. The frictional resistance of the pile side is positively correlated with the penetration rate, and the ultimate bearing capacity and the resistance of the pile tip are negatively correlated with the velocity.