矩形基础承载力形状系数三维数值模拟

3D Numerical Analysis of Bearing Capacity Shape Factors for Rectangular Footings

通过对矩形基础地基承载力的三维数值模拟,分析了基础形状对承载力的影响,并计算了矩形基础承载力形状系数.计算结果表明:形状系数scs、q随地基内摩擦角增加而增加,随长宽比的增加而降低;当内摩擦角较小时,形状系数sγ随长宽比的增加而增加;当内摩擦角较大时,sγ则随长宽比的增加而降低;与Meyerhof以及De Beer经验公式相比,计算得出的形状系数scs、q与经验公式较为接近,而sγ则相差较大;相对而言,De Beer建议的sγ偏于保守,而Meyerhof建议的sγ则偏大.

The bearing capacity shape factors of rectangular footings were calculated and the shape effect was investigated with 3D numerical analyses. The results show that sc and sq increase with the increasing of internal friction angle, and decrease with the increasing of footing aspect ratio, sr increases with the increasing of footing aspect ratio for low internal friction angle, and decreases with the increasing of footing aspect ratio for higher internal friction angle. Compared with Meyerhof and De Beer＇s empirical formula, the shape factors s, and sq are close to the empirical values, while sr is different obviously. The calculated results show that the sr proposed by De Beer may be conservative and that proposed by Meyerhof may be overestimated in some extent.