A novel numerical procedure for defining failure envelopes of pile groups under inclined and eccentric load is proposed. The starting point is a closed-form exact solution for interaction diagram of pile groups under combined axial-moment loading recently published in the literature. Failure envelopes in the generalised force space are then derived as an extension of this solution by means of an incremental algorithm. It is shown that the axial load at foundation level has always a beneficial effect on the lateral capacity of the pile group, even if this favourable effect is often neglected in practice. On the contrary, the amount of interaction between the horizontal and moment components of the resultant action at failure is usually very small, with the exception of piles groups with end-bearing piles. Some example applications of the proposed method are provided and a simple, yet reliable procedure for ultimate limit-state analysis of pile groups subjected to inclined and eccentric loads is suggested.

中文翻译：

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倾斜偏心荷载作用下群桩破坏包络线

提出了一种在倾斜和偏心荷载下定义桩组破坏包络的新数值程序。起点是最近发表在文献中的组合轴力矩载荷下桩群相互作用图的封闭形式精确解。然后通过增量算法导出广义力空间中的失效包络作为该解决方案的扩展。结果表明，地基水平的轴向荷载总是对桩组的侧向承载力有有益的影响，即使这种有利的影响在实践中经常被忽略。相反，破坏时合成作用的水平分量和弯矩分量之间的相互作用量通常非常小，带有端承桩的桩组除外。