弹性和刚性嵌岩桩混合群桩基础计算

Calculation of Combined Group Pile Foundation of Elastic and Rigid Socketed Piles

当桥梁建于岩面起伏很大的岩石地区时,甚至同一个桥墩承台下,不同的钻孔,岩面起伏很大,岩面上的覆盖土层承载力也很差,这时扩大基础不合适,只能采用桩基础。这样同一个承台下,有些桩桩头到岩面距离较小,有些则较大,也即在同一个承台下,同时出现了刚性嵌岩桩和弹性嵌岩桩,如何计算这类群桩基础的单桩内力?运用结构力学位移法相关知识,计算得到每根桩分配到的内力,再根据分配到的内力值,总结桩基内力值与桩哪些参数有关,可为相关类似的群桩基础计算提供参考。

When a bridge is constructed in the large undulating rock surface of rock region, even under a same base slab of bridge pier, the different drillings have the large undulating rock surfaces, and the bearing capacity of covering soil layer on rock surface is also poor. It is not suitable to expand the foundation at this time, and the pile foundation has to be used only. Thus under a same base slab, the distance from some pile heads to rock surface is smaller, and some is larger. Also under a same base slab, the rigid socketed pile and elastic socketed pile will appear at same time. How to calculate the inner force of single pile for this kind of group pile? The relative knowledge of structural mechanics displacement method is applied to calculate the inner force distributed to each pile, and then based on the distributed inner force value, the parameters of inner force value of pile foundation related to the pile are summarized, which can be referred for the similar foundation calculations of group pile.