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现行地基承载力计算公式未考虑中主应力的影响,也未考虑侧压力系数K0的影响。基于平面强度理论,推导出SMP、Lade、M-C三大强度准则的统一表达式,进而推导出基于统一表达式的考虑K0变化的塑性界面方程,详细对比了三大准则在考虑K0及不考虑K0时塑性界面的特性。研究了内摩擦角、黏聚力及超固结度对于临塑、临界荷载的影响。结果表明:现规范采用的方法计算的临界荷载与同时考虑中主应力和K0变化的SMP准则得到的结果仅在内摩擦角较小时计算结果类似。临界荷载和临塑荷载随着内摩擦角或黏聚力的增大而增大。超固结度对于临塑荷载的影响很小,但对于临界荷载影响较大,且随着内摩擦角的增大而增大。
The calculation formula of the bearing capacity of the existing foundation does not consider the influence of the middle principal stress nor the influence of the lateral pressure coefficient K0. Based on the theory of plane strength, the unified expression of SMP, Lade and MC is deduced, and then the plastic interface equation considering K0 change based on uniform expression is deduced. The three criteria are compared in detail in considering K0 and not considering K0 The characteristics of the plastic interface. The effects of internal friction angle, cohesion and over-consolidation on the plastic and critical loads were studied. The results show that the calculated results of the critical load calculated by the current method and the SMP criterion considering both the principal stress and K0 change are similar only when the internal friction angle is small. The critical load and plastic load increase with the increase of internal friction angle or cohesion. The degree of over-consolidation has little effect on the plasticizing load, but it has a great influence on the critical load and increases with the increase of the internal friction angle.