高填方路堤软弱地基的承载力分析

Bearing Capacity Analysis on Soft Foundation of High Embankment

利用应力和孔隙水压力耦合的方法对路堤填筑过程中地基的孔隙水压力分布进行研究。在分析地基中孔隙水压力变化规律的基础上,利用极限平衡方法对地基的稳定性进行分析,探讨了上部荷载以及超孔隙水压力对地基中潜在滑动面形状、位置以及地基极限承载力的影响,提出了高填方路堤软弱地基承载力的合理计算方法。利用此方法研究了路堤下地基极限承载力随强度参数的变化规律,结果表明:软土地基的承载力随黏聚力和内摩擦角的增大而近似线性增大。

The distribution of the pore water pressure in the foundation during embankment construction was studied by using stress-pore water pressure coupling method. Based on the analysis on the change rule of the pore water pressure in the foundation,the stability of the foundation was analyzed by the limit equilibrium method. The influence of the upper load and extra pore water pressure on the shape and location of the slip surface in the foundation and the ultimate bearing capacity was discussed. A reasonable method for calculating the bearing capacity of the soft foundation of high embankment was proposed. The rule of the ultimate bearing capacity of the foundation changing with different strength parameters of embankment was studied by the proposed method. The results show that the ultimate bearing capacity is approximately increased linearly with the increase of the cohesion and the internal friction angle of the soft soil foundation.