桩靴插桩动力过程的数值模拟方法研究

Numerical simulation method for dynamic process of spudcan penetration

基于耦合的欧拉-拉格朗日方法(CEL),模拟黏土中自升式钻井船桩靴插桩过程,并对计算中的参数进行敏感性分析。结果表明:CEL方法中选取合理参数可有效模拟离心模型试验下压阻力结果;模型中最小网格尺寸较大会使计算结果产生震荡,建议取0.05倍桩靴直径;桩靴插桩速率v速度较慢时对下压阻力影响较小,建议取为1 m/s;桩靴与土摩擦系数f对桩靴下压阻力影响较小,黏土中建议设置为0即光滑接触;地应力步中侧压力系数K0应与其他土体参数协调,黏土中建议取值为1。

Based on the coupled Euler-Lagrange(CEL)method,the process of spudcan penetration is simulated,and several parameters affecting the calculated results are analyzed.The results show that the reasonable parameters in the CEL method can effectively simulate the penetration resistance results of centrifugal model tests.The large mesh size in the model will cause the calculated results to shake,so it is recommended to take 0.05 times the diameter of spudcan.Slow spudcan penetration speed v,has small influences on the lower penetration resistance,and it is recommended to be 1 m/s.The friction coefficient f between spudcan and soil has small influences on the penetration resistance,and smooth contact is recommended in clay.The lateral pressure coefficient K0 of the geostress step should be coordinated with other soil parameters,and it is recommended to be 1 for clay.