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桩的工作性状是岩土工程中最不确定的问题之一,其中主要原因是对桩在打入加载过程中所造成的桩周土物理状态和应力状态的改变还不是很清楚,对其进行数值模拟时,需要考虑大变形、边界条件改变及桩、土接触问题,一般有限元法在网格剖分上不能解决大变形问题,在边界条件及桩、土界面处理方面不能很好的模拟实际情况。计算实例表明,基于ABAQUS的ALE(任意拉格朗日-欧拉法)方法有效的模拟了贯入时土体的应力变化情况,并得到以下结论:ALE方法能有效避免拉格朗日法有限元分析中网格畸变以及高度扭曲问题,与实际相符合,真实的反映了岩土工程中的弹塑性的变形情况,可以应用到岩土工程中的大变形问题中。以ALE方法为基础对CPT(静力触探试验)贯入试验进行有限元模拟对合理解释CPT的试验的结果是非常有效的。
The working characteristics of the pile is one of the most uncertain problems in geotechnical engineering. The main reason is that the change of the physical and stress state of the surrounding soil caused by the pile during the loading is still not clear. In numerical simulation, large deformation, boundary conditions change and pile-soil contact problems need to be considered. Generally, finite element method can not solve large deformation problems in meshing, and can not be well simulated in boundary conditions and pile and soil interface processing The actual situation. The calculation example shows that the ABAQUS-based ALE (arbitrary Lagrange-Eulerian method) can effectively simulate the stress changes of soils under intrusion and obtain the following conclusions: The ALE method can effectively avoid the finite Lagrange method The problem of grid distortion and height distortion in meta-analysis is consistent with the actual situation and truly reflects the elastoplastic deformation in geotechnical engineering. It can be applied to large deformation problems in geotechnical engineering. Finite element simulation of the CPT (Static Cone Detection) penetration test based on the ALE method is very effective in interpreting the results of a CPT test reasonably.