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Effects of restraining conditions on the bearing capacity of footings near slopes

机译：约束条件对斜坡附近地基承载力的影响

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摘要

In evaluating the ultimate bearing capacity (q(u)) of a strip footing adjacent to a slope, conventional correction formulas for the effect of load eccentricity may not be applicable because these formulas were developed exclusively for footings situated on horizontal grounds, where loads eccentric to opposite sides of the footing yield identical results for q(u). In this study, loading tests and analyses are conducted on a strip footing placed adjacent to a model slope with various slope angles. The experimental evidence shows that a load eccentric toward the heel of a footing leads to an increase in bearing capacity, whereas the analytical results based on conventional formulas show the opposite trend. To address this discrepancy, an approach is proposed that uses a bearing capacity correction formula for a footing with a setback from the crest of the slope. Results of a comparative study show that the experimental values for bearing capacity factor N-gamma(test), with full corrections for load inclination, load eccentricity, and footing setback are comparable to the theoretical solutions. Furthermore, fully corrected values for N-gamma(test) for the fixed footing approximately follow the line of the upper boundary; those for the free-rotating footing follow the lower boundary of the theoretical solutions reported in the literature. This discrepancy is due to the different failure mechanisms induced by the restraining conditions of the footing which have yet to be considered in engineering practice. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：在评估与斜坡相邻的条形基础的极限承载力（q（u））时，对于载荷偏心率影响的常规校正公式可能不适用，因为这些公式专门针对位于水平地面上的偏心载荷的基础对于立足点的相反两侧，q（u）的结果相同。在这项研究中，荷载测试和分析是在带基础坡度的带状基础上进行的，该基础坡度与模型坡度不同。实验证据表明，偏心于脚后跟的载荷导致承载力增加，而基于常规公式的分析结果则显示出相反的趋势。为了解决这一差异，提出了一种方法，该方法将承载力校正公式用于从坡顶回落的基础。一项比较研究的结果表明，在对载荷倾斜度，载荷偏心率和立足点进行完全校正的情况下，承载力因子N-γ（test）的实验值与理论解相当。此外，针对固定基础的N-gamma（test）的完全校正值近似遵循上边界线；自由旋转立足点的那些遵循文献报道的理论解的下边界。这种差异是由于立足约束条件引起的不同失效机制所致，而工程实践中尚未考虑这些机制。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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