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Experimental Research on Flexible Pipelines in Soft Soil Foundations Under Uneven Settlement
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摘要: 软土地基不均匀沉降对埋地管线构成潜在威胁。柔性管道因抗弯刚度低，在不均匀沉降中易变形及破损。通过不均匀沉降作用下软土地基柔性管道模型试验，分析了地基不均匀沉降作用下土压力的变化规律、柔性管道的力学特性，并深入探究了管径和埋深对柔性管道力学响应的影响。结果表明：在6次不均匀沉降作用下，管顶土压力显著增长，管侧土压力最大，土压力系数也随着沉降深度和沉降范围的增加而增大，并确定了土压力系数与沉降深度及范围的非线性表达式，可为评估不均匀沉降作用下柔性管道的受力分析提供理论依据；管道轴向、环向应力和位移随沉降范围与沉降深度增加而增大。即增大管径或减小埋深可有效降低管道应力和位移，因此，在工程设计中应综合考量管径和埋深两个因素的影响。Abstract: Uneven settlement of soft soil foundations poses a potential threat to buried pipelines. Due to their low flexural stiffness， flexible pipelines are particularly prone to deformation and damage during such settlement. Through model tests of flexible pipelines in soft soil foundations under uneven settlement， this paper analyzed the variations in soil pressure and the mechanical characteristics of the pipelines. It further investigated the influence of pipe diameter and burial depth on the mechanical response of flexible pipelines. The results showed that after six cycles of uneven settlement， the soil pressure on the top of the pipeline increased significantly， with the soil pressure on the side of the pipeline reaching the largest. The soil pressure coefficient also increased with the number of settlement cycles. A nonlinear expression was established， relating the soil pressure coefficient to both the settlement depth and range， which can provide a theoretical basis for evaluating the mechanical response of flexible pipelines under uneven settlement. Both axial and circumferential stresses， as well as the displacements of the pipeline， increased with the expansion of the settlement range and the increase in the settlement magnitude. Increasing the pipe diameter or reducing the burial depth can effectively reduce pipeline stress and displacement. Therefore， in engineering design， the combined influence of both pipe diameter and burial depth should be comprehensively considered.
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Key words:
- soft soil foundation /
- model tests /
- uneven settlement /
- flexible pipeline
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