关于偏心荷载下地基承载力的验算方法

针对偏心荷载作用下的地基承载力验算，以条形基础为例，介绍了Meyerhof提出的考虑荷载偏心的地基承载力计算方法，并通过与有限元上下限极限分析这一极限荷载精细数值计算方法的比较验证了其正确性和准确性。所考虑的地基既包括排水条件下的一般地基，也包括不排水强度随深度近似线性增大的饱和黏性土地基。依据有关机理深入分析了基础埋深对偏心荷载下地基承载力计算精度的影响，明确了可以考虑基础埋深有利作用的偏心距上限。进而采用本课题组所提出计算地基承载力的改进公式，通过计算并结合理论分析比较了国内规范验算方法与按Meyerhof方法的验算，表明采用后一方法更为合理。

On the checking methods for bearing capacity of foundation under eccentric loading

For the checking of bearing capacity of foundation under eccentric loading, the method given by Meyerhof is first introduced，and validated for its accuracy through comparison with calculations by using the finite element upper and lower bound limit analysis method which can compute general limit loads accurately. The foundation soil considered can be either general c-? soil under drained conditions or undrained cohesive soil with its undrained strength increasing linearly along depth. In particular, the influence of the footing embedment depth on the calculation accuracy is discussed according to the understanding of relevant mechanism，and the largest eccentricity below which the bearing capacity due to footing embedment depth can be taken fully into account is clarified. Thereafter, the checking method proposed in the Chinese design code is compared with the Meyerhof method through calculations by using the improved bearing capacity formulae given by the authors, which indicates that the latter method is more reasonable.