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土体在承载过程中渗透系数会发生变化,因此,在渗流作用下计算管片荷载需考虑土体渗透系数的变化。首先,根据土体渗透系数试验结果,给出了简化的分段孔隙比-渗透系数关系曲线。然后,建立了管片和土体的流-固耦合分析模型,包括渗流模型和力学模型;力学模型中土体分为弹性区和塑性区,其中弹性区根据孔隙比-渗透系数关系曲线进一步分区,从而考虑土体渗透系数变化的影响。最后,通过各分区半径取值将渗流和力学计算之间建立起联系,得到流-固耦合计算方法。计算结果为管片承载设计提供了参考。
The permeability coefficient of soil will change during the bearing process. Therefore, the change of permeability coefficient of soils should be considered when calculating the load of the pipelines under seepage. First, based on the test results of soil permeability coefficient, a simplified plot of pore-to-osmotic coefficient is given. Then, the fluid-solid coupling analysis model of the pipe and soil is established, including the seepage model and the mechanical model. The soil is divided into the elastic zone and the plastic zone in the mechanical model, and the elastic zone is further divided according to the porosity-permeability curve , So as to consider the influence of the change of soil permeability coefficient. Finally, the relationship between seepage and mechanics calculation is established through the radius of each zone, and the fluid-solid coupling calculation method is obtained. The calculation results provide reference for the bearing design of the segment.