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采用能够同时考虑主次固结变形的Yin-Graham一维弹粘塑性模型,获得梯形周期荷载作用下软基路堤的长期总沉降和工后沉降计算公式。理论分析表明,经地基排水措施处理后,周期荷载作用下计算路堤的一维长期沉降时无需考虑流固耦合效应。计算公式表明,梯形周期荷载作用下路堤的长期沉降不但与初始有效应力和超固结比等应力状态和应力历史有关,而且与软土的物理参数如回弹指数、压缩指数和蠕变系数也有关。算例根据该文提供的长期总沉降公式预估了某工程路堤运行期结束时的总沉降量,确定路堤竣工时必须完成的临界沉降量,为确定公路路面铺筑时刻提供了沉降依据。
The Yin-Graham one-dimensional elasto-viscoplastic model, which can consider the primary and secondary consolidation deformation, is adopted to obtain the long-term total settlement and post-construction settlement formula of the soft-soil embankment under the action of trapezoidal cyclic loading. The theoretical analysis shows that the fluid-solid coupling effect need not be considered when calculating the one-dimensional long-term settlement of the embankment after being treated by the foundation drainage measures. The calculation formula shows that the long-term subsidence of the embankment under the trapezoidal cyclic load is not only related to the initial stress and overconsolidation ratio of stress state and stress history, but also with the physical parameters of soft soil such as rebound index, compressibility index and creep coefficient related. Based on the long-term total settlement formula provided in this paper, the example predicts the total settlement at the end of an engineering embankment and determines the critical settlement that must be completed when the embankment is completed. It provides the basis for settling the road pavement.