锚拉或刚架抗滑桩计算的解析和数值方法

Analytical and numerical method for the calculation of anti-slide pile with anchor or rigid frame

锚拉或刚架抗滑桩的准确计算是较为困难的,有关其计算方法的研究报道尚不多见。为此,以福建省某特大型滑坡治理设计为例,探讨了这两类桩的位移和内力计算的弹性支座连续梁法(结构力学求解器的解析法)和弹性杆系有限元法(数值法)。结果表明,二者对锚索抗滑桩的计算结果相当一致:一方面表明虽然前者建模较繁复,但其使用简单,且可获得问题的解析解,不失为计算这些抗滑支挡结构的新方法;另一方面表明后者虽作为一种数值方法,却具有足够的计算精度,是一种建模简单、便于应用的方法。同时表明,滑坡推力分布形式的假定不同对计算结果影响显著,继而对滑坡治理工程的造价影响很大,因而,在大型滑(边)坡治理工程中对其进行慎重分析和合理考虑是十分重要的。

The accurate calculation of anti-slide pile with anchor or rigid frame is relatively difficult,and the study on the calculation method is seldom reported. A case study of an extremely large-scale landslide in Fujian was carried out. The elastic support continuous beam method( analytical method by the structural mechanics solver) and the elastic link finite method( numerical method) were discussed on the calculation of displacement and internal force. The study shows that the two computation results of the pile with prestressed anchors obtained by the two methods agreed well,although the modeling by the former is somewhat cumbersome,it is still a new analytical approach to calculate these retaining structures;on the other hand,the latter is a numerical method with accurate results,and it is convenient in use because its modeling is easy;meanwhile the assumed distribution form landslide thrust would prominently affect the computation results,and then affect the project cost greatly. Therefore carefully analyzing and reasonably considering is extremely important in the control of large-scale slope and landslide treatment project.