基于强度折减法的穿江管道抗浮稳定性分析

Analysis of the Stability of River-crossing Pipelines against Uplift Based on the Strength Reduction Method

  • 摘要: 传统有限元法在管道抗浮分析中取得了较好的结果,但并没给出管道埋深下的抗浮稳定安全系数。为此文章采用强度折减法,建立 ABAQUS管道抗浮模型,对穿江管道在浮力作用下的行为进行二维数值模拟分析,观察土体塑性区发展过程,确定抗浮稳定安全系数。结果表明,通过改变管道埋深,管道抗浮稳定系数呈线性增加,斜率受土体摩擦角控制;与传统重力分析法相比较,得到了重力分析法的等效c值和φ值,其值可作为实际应用中重力分析法的适用条件。

     

    Abstract: Traditional finite element method has been successfully applied in the analysis of the capability against uplift of pipelines, but it didn’t give the safety factors of the anti-uplift stability relating to the buried depth of pipelines. An ABAQUS model of anti-uplift of pipelines was established by using strength reduction method to take a two-dimensional numerical simulation of the behaviors of river-crossing pipelines under the effect of buoyancy, to observe the development process of plastic zone of soils and to determine the safety factor of anti-uplift stability.The results show that the factors of anti-uplift capability increase linearly as the function of the buried depth and the slope is governed by the friction angle of soil mass; equivalent values of and used in gravity analysis method, which may be taken as the applicable conditions in practical application cases, are obtained by comparing with the traditional gravity analysis method.

     

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