Study on Calculation of Critical Height of Heterogeneous Soft Soil Foundation

Based on the analysis the mechanics destabilization of embankment and soft soil foundation,calculation method of the critical height of heterogeneous soft soil foundation is studied,when the line engineering passes the soft soil area.After the whole stability of embankment and foundation is calculated,comparing the relationship of longitudinal and lateral of filled-up height and stability coefficient,the critical height of heterogeneous soft soil foundation is obtained.Numerical analyses provide the distribution of displacement in soft foundation caused by filling-up.Researches show that if the height of filling-up is near the critical height of embankment plastic deformation occurred.And failure of embankment slope slides out from the middle line of embankment under the action of limited symmetry loads.The calculated failure type of embankment is similar to that types of embankment in situ.So this method introduced here is feasible.