嵌岩桩承载性状有限元分析

Study of Tip Resistance of Rock-embedded Pile

嵌岩桩由于其承载力高,其原型试验所需经费多,而且不易做到破坏,这就使对嵌岩桩的数值模拟成为必要。采用三维有限元方法对嵌岩桩的承载性状进行了模拟,对土、岩石均采用Drucker-Prager模型,在不同的工况下对嵌岩桩的承载性状进行了分析。最后,将三维有限元方法引入了具体的工程实例,把有限元分析的结果与实测的数据进行了比较分析,取得了较好的一致性,说明采用的有限元模型对嵌岩桩的分析是比较符合实际情况的。

Because test with the static of the high bearing resistance of the rock-embedded pile, it is expensive to conduct prototype load and it is hard to get to the point of the damage. So it is necessary to simulate the character of the rock-embedded pile under high load by numerical method. In this paper, three-dimension finite element method is introduced to simulate the behave of the rock-embedded pile. The model of Drucker-Prager is considered as suiting to the soil and the rock. And then the characters of the rock-embedded pile are analysed under different conditions. Finally, the method is used in some practical engineering. The comparison between the results obtained by this method and data from the practical project shows good agreement in some degree.