Method and device for determining soil pressure of large-diameter steel cylinder under pile pitching action of drilling ship

The invention relates to a method for determining the soil pressure of a large-diameter steel cylinder under the pile pitching action of a drilling ship, and the method comprises the steps: proposing a soil pressure vertical distribution mode and a normalized soil pressure coefficient based on the soil pressure distribution, the maximum value and the position of the soil pressure on the steel cylinder in a model test and numerical simulation; the soil pressure on the steel cylinder under the action of the pile shoe can be accurately evaluated; according to the method, the soil pressure on the steel cylinder under different pile shoe-steel cylinder distances can be rapidly evaluated, and design reference and application of an underwater protection structure are facilitated. 本发明涉及一种钻井船插桩作用下大直径钢圆筒土压力确定方法，基于模型试验和数值模拟中钢圆筒上的土压力分布、土压力最大值及其位置，提出土压力竖向分布模式和归一化土压力系数，能够较准确评估桩靴作用下钢圆筒上的土压力；本发明可快速评估不同桩靴-钢圆筒间距下钢圆筒上的土压力，有利于水下防护结构设计参考和应用。