胡亚元. 梯形周期荷载作用下软基路堤的一维沉降研究[J]. 工程力学, 2010, 27(12): 114-118.
引用本文: 胡亚元. 梯形周期荷载作用下软基路堤的一维沉降研究[J]. 工程力学, 2010, 27(12): 114-118.
HU Ya-yuan. STUDY ON THE 1-D SETTLEMENT OF ROAD EMBANKMENT ON SOFT CLAY UNDER TRAPEZOIDAL PERIODIC LOADING[J]. Engineering Mechanics, 2010, 27(12): 114-118.
Citation: HU Ya-yuan. STUDY ON THE 1-D SETTLEMENT OF ROAD EMBANKMENT ON SOFT CLAY UNDER TRAPEZOIDAL PERIODIC LOADING[J]. Engineering Mechanics, 2010, 27(12): 114-118.

梯形周期荷载作用下软基路堤的一维沉降研究

STUDY ON THE 1-D SETTLEMENT OF ROAD EMBANKMENT ON SOFT CLAY UNDER TRAPEZOIDAL PERIODIC LOADING

  • 摘要: 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。

     

    Abstract: Making use of Yin and Graham’s 1-D elastic visco-plastic model which can predict both the primary and secondary compression, the formulae of calculating the long term settlements at the end of the road operation period and/or during road operation period induced by the trapezoidal periodic loading are theoretically deduced. The theoretical results show that the permanent 1-D settlement of road embankment under period loading can be calculated without regard to the solid-fluid coupling when the condition of ground drain is improved by some ground treatment. The formulae show that the long term and post-construction settlements are not only related to both stress states and stress history such as initial effective stress and over consolidation ratio, but also related to physical indices such as swelling index and compression index and creeping coefficient. In the cases, the total settlement of road embankment at the end of its operation period is numerically evaluated by making use of the long term settlement formulae provided in the paper, and the critical settlement of road embankment at the start of its operation period is further determined, which can provide the reasonable settlement standard for determining the start time of road pavement construction in expressway road.

     

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