Pile under different loading situation by the FEM simulation and analysis on pile lateral friction resistance
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摘要: 采用弹塑性有限元法,结合岩土体结构特征,应用接触单元模拟桩土之间的不连续面,分别对单桩传统静载加载方式和自平衡加载方式进行数值模拟。自平衡加载方式的数值模拟结果与实际自平衡测试结果吻合较好,说明选取的模型和参数比较合理。进而采用此模型和参数,对传统静载加载方式进行数值模拟,得出桩上部荷载传递过程中桩及桩周岩土体应力及位移,求出各单元的应力应变,确定出桩侧法向应力,结合桩土之间摩擦试验的参数,根据莫尔-库仑理论求出桩侧摩阻力。最后将有限元数值模拟和自平衡实测侧摩阻力值进行对比,验证了在选用合理的模型和物理力学参数的基础上,有限元计算的侧摩阻力值和实测值较吻合,通过有限元方法计算获得的单桩侧摩阻力值具有一定的可借鉴性和实用性。Abstract: This paper applied the plastic and elastic FEM to simulating static loading method and self-balanced method of single pile.It used contact element to simulate the discontinue face between pile and soil and combined the structure characteristics of soil and rock mass.The outcomes of simulation of the self-balanced method and that of the self-balanced method in field coincide better,so the model and coefficients used is reasonable.And then,through the simulation of the static loading method,the stress and displacement of pile and soil around the pile is analyzed.At the same time,the value of stress and strain of the element is obtained and the pile lateral normal force is determined.Finally,we get the pile lateral friction resistance combined with friction parameters by piles territories test,according to Mohr-coulomb theory.Compared the outcomes of FEM Simulation with outcomes of self-balanced method,it is certified that they coincide better based on reasonable selection of the physical parameters and mechanics models.Getting pole lateral friction resistance through FEM calculation is feasible.
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