Abstract In this paper, the effect of the adjacency of two strip footings on bearing capacity of rock masses was investigated using the upper bound analysis and finite element method. The modified Hoek-Brown nonlinear failure criterion was used for the rock mass. The effect of various parameters such as the distance between the two footings, Hoek-Brown parameters, surcharge pressure and unit weight of the rock mass on the ultimate bearing capacity of rock masses were also investigated. The results show that if the distance between the two footings is significant, the failure lines occur beneath each footing will not interfere with the failure lines beneath the other adjacent footing and each footing behaves as a single one. The maximum distance for which the two footings affect each other can be obtained from the charts presented in this paper. By reducing the distance between the two footings, the bearing capacity will increase firstly and then decrease. Finally, when the two footings touch each other, the ultimate bearing capacity of the two footings will be equal to the ultimate bearing capacity of a single isolated footing with a width twice the width of each footing.

中文翻译：

---

岩体上相邻两个基脚承载力的上界解

摘要 本文采用上界分析和有限元方法，研究了两个条形基础相邻对岩体承载力的影响。修改后的 Hoek-Brown 非线性破坏准则用于岩体。研究了两基脚间距、Hoek-Brown参数、超载压力和岩体单位重量等各种参数对岩体极限承载力的影响。结果表明，如果两个基脚之间的距离很大，则每个基脚下方发生的破坏线不会干扰另一个相邻基脚下方的破坏线，并且每个基脚都表现为一个单独的基脚。可以从本文提供的图表中获得两个基础相互影响的最大距离。通过减小两个地脚之间的距离，承载力会先增加后减小。最后，当两个基脚相互接触时，两个基脚的极限承载力将等于宽度为每个基脚宽度两倍的单个孤立基脚的极限承载力。