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针对浙江省宁波市沿海某围垦吹填土堤边坡稳定问题,引入颗粒流方法,借助颗粒流双轴试验标定吹填土细观参数,给出了颗粒流法土堤边坡失稳的判据,建立吹填土堤颗粒流分析模型,分别利用强度折减法和重力增加法分析了该土堤边坡的稳定性。结果表明,可直接观察土堤的失稳破坏过程和滑动面的形成;发现整个堤坡表现出上部受拉、中部受剪、底部受压的破坏形式;颗粒流法中的重力增加法的安全系数和强度折减法一致,但其边坡破坏表现为浅层滑动;对比颗粒流法与刚体极限平衡法的计算结果,两者滑坡面形状相似,但安全系数有所偏差。该方法可为沿海吹填土堤边坡设计提供参考依据。
Aimed at the slope stability of a reclamation dredging embankment along the coast of Ningbo City, Zhejiang Province, particle flow method was introduced to calibrate the fissure seepage parameters by means of particle flow biaxial test. According to the above, a particle flow analysis model of embankment is established. The stability of the embankment slope is analyzed by strength reduction method and gravity increase method respectively. The results show that the failure process of the embankment and the formation of the sliding surface can be observed directly. It is found that the whole embankment shows the form of upper tension, middle shear and bottom compression. The safety of gravity increase method in the particle flow method Coefficient and strength reduction method are the same, but the slope failure is superficial sliding. Compared with the results of particle flow method and rigid body limit equilibrium method, the landslide shape of the two is similar, but the safety coefficient is deviated. The method can provide references for design of embankment embankment along the coast.