The current study investigates the ultimate bearing capacity of obliquely/eccentrically loaded shallow strip foundations resting on a geogrid-reinforced granular fill with limited thickness over a very soft to soft clay layer. To this end, the lower bound theorems of the finite element limit analysis (FELA) and second-order cone programming (SOCP) are effectively exploited to simulate the underlying clay deposit, geogrid layer, and granular fill along with the inclined/eccentric loading exerted on the overlying footing. The accuracy of the adopted formulations is rigorously examined through several comparisons with the results of a well-established analytical approach in the literature. A comprehensive parametric study is then conducted to properly examine the influences of the geosynthetic layer characteristics and soft clay properties on the overall bearing capacity and failure envelope of the strip footing subjected to wide ranges of inclined and eccentric loadings. The results show that placement of a geogrid-reinforced granular fill layer over the soft clayey soil significantly increases the bearing capacity of the shallow foundation. The ultimate tensile strength of the reinforcement layer and the cohesion of the underlying very soft to soft clay deposit are also observed to have considerable effects on the size of failure envelopes.

中文翻译：

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软粘土上土工格栅加筋颗粒填料基础的综合承载力

目前的研究调查了倾斜/偏心加载的浅条形基础的极限承载力，该基础位于极软至软粘土层上有限厚度的土工格栅增强颗粒填充物上。为此，有效地利用有限元极限分析（FELA）和二阶锥规划（SOCP）的下界定理来模拟下伏粘土沉积物、土工格栅层和颗粒填充物以及所施加的倾斜/偏心载荷在上覆的基础上。通过与文献中成熟的分析方法的结果进行多次比较，严格检验所采用的公式的准确性。然后进行全面的参数研究，以正确检查土工合成材料层特性和软粘土特性对承受大范围倾斜和偏心载荷的条形基础的整体承载能力和破坏包络线的影响。结果表明，在软粘土上放置土工格栅加筋颗粒填充层可显着提高浅基础的承载力。还观察到加固层的极限拉伸强度和下面的非常软到软粘土沉积物的内聚力对破坏包络线的尺寸有相当大的影响。