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针对路堤填土自重作用下的平面应变天然软土地基,基于能合理反映中间主应力效应的广义SMP准则,同时考虑地基软土的侧压力系数和固结程度,建立了软土地基临界荷载与路堤临界填土高度的解析公式,并给出公式适用条件,最后结合M–C准则解答探讨了各参数的影响特性。经与文献结果比较,验证了解析公式的正确性及所给公式适用条件的必要性。参数分析表明:固结度、侧压力系数、黏聚力及内摩擦角对路堤临界填土高度的影响均很显著,不应盲目选定固结度为0或100%进行计算;M–C准则的结果偏保守,考虑中间主应力所得解答的最小侧压力系数更小、公式适用范围更广;应原位测定地基软土的真实侧压力系数,并充分考虑其抗剪强度参数的变异性。
Aiming at the plane strain natural soft foundation under the action of embankment filling gravity, based on the generalized SMP criterion that can reasonably reflect the effect of intermediate principal stress, considering the lateral pressure coefficient and consolidation degree of the foundation soft soil, The analytical formula of the embankment critical fill height is given, and the applicable conditions are given. Finally, the influence characteristics of each parameter are discussed with M-C criterion solution. Compared with the literature results, the correctness of analytic formula and the necessity of applying the formula are verified. The parameter analysis shows that the influence of the consolidation degree, lateral pressure coefficient, cohesion and internal friction angle on the critical height of embankment are significant. The consolidation degree should not be blindly selected as 0 or 100%. M-C The results of the criterion are conservative. The minimum lateral pressure coefficient of the solution considering the intermediate principal stress is smaller and the formula is more applicable. The true lateral pressure coefficient of the foundation soft soil should be measured in situ and the variation of the shear strength parameter .