浅基础在水平荷载与力矩荷载作用下承载性能研究

联合采用swipe加载模式和固定位移比加载模式, 通过数值模拟，对条形浅基础在水平与力矩荷载作用下的承载性能进行了比较系统的分析, 主要探讨了埋深、地基土不排水强度的各向异性对于复合加载条件下浅基础破坏包络面的影响, 揭示了地基在水平和力矩荷载的不同组合条件下的失稳破坏机理。计算结果表明: 当浅基础埋深与宽度之比大于0.5时, 基础的破坏包络面出现比较显著的倾斜, 而且不满足前人建议的包络面方程; 在归一化荷载平面内, 埋深对于包络面的形状有较大影响, 而在给定埋深情况下, 其形状与地基土强度的各向异性无关。

Studies on bearing capacity of shallow foundations subjected to horinzontal and moment loading

Combined with swipe loading method and fixed displacement ratio method, the bearing capacity of shallow embedded strip foundations subjected to horizontal and moment loads is explored through finite element numerical studies. The effect of embedment and soil strength anisotropy on the failure envelope of shallow foundations is investigated and the soil deformation mechanism under various combinations of horizontal and moment loads is shown.The results indicate that under the condition the embedment ratio is larger than 0.5, the failure envelope of shallow foundations is appreciably oblique and does not obey the available equation proposed by other authors. The results presented in this paper show that the embedment ratio significantly affects the shape of the failure envelope expressed in terms of loads normalized by pure moment and pure horizontal load capacity, however the shape of failure envelope defining the undrained capacity of shallow foundations under horizontal and moment loads is independent on soil strength anisotropy.