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Uplift resistance and mobilization of buried pipelines in unsaturated sands

机译：非饱和砂土中的抗浮力和地下管道的动员

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Pipelines are commonly buried in depth of lm to 2m in which the soil condition is most often partially saturated. However, the conventional design guidelines and available analytical models for predicting the uplift resistance and mobilization are based on assumption that the soil is either dry or fully saturated. In unsaturated soils, such an assumption often leads to under-estimate of uplift resistance and over-estimation of uplift mobilization. Enhanced strength and stiffness of unsaturated soils due to suction can increase the uplift resistance along with substantially different peak mobilizations as compared to tradition estimations. This can lead to under or over-estimation of remedial measures during feasibility/design stage, thus false bidding/project estimations. This paper examines the effect of partial saturation on the peak uplift resistance and mobilization of pipelines buried in sandy soils using numerical modelling. Two-dimensional finite element (FE) analyses were conducted on the basis of steel pipeline buried in unsaturated finer sand behaviour of which was modelled using modified Mohr-Coulomb model. Firstly, the numerical model was validated against the reported full scale test data, and then the analyses were extended for various pipe sizes, cover heights and degree of saturations of sands. Results showed that the peak-mobilization can be significantly different than that suggested by current guidelines, and strongly depend on the factors considered in the current study.
机译：管道通常埋在lm到2m的深度内，在这种深度下，土壤条件通常是部分饱和的。但是，传统的设计准则和可用的预测抗隆起性和动员性的分析模型是基于土壤是干燥或完全饱和的假设。在非饱和土壤中，这样的假设通常会导致低估抗隆起能力和高估抗冲能力。与传统估算相比，由于吸力而增加的非饱和土壤的强度和刚度可以增加抗拔力，并具有明显不同的峰值动员能力。这可能导致在可行性/设计阶段对补救措施的估计过低或过高，从而导致错误的投标/项目估计。本文利用数值模拟方法研究了部分饱和度对沙质土壤中埋藏管道的峰值抗力和动员的影响。基于埋在非饱和细砂行为中的钢管进行了二维有限元分析，使用改进的Mohr-Coulomb模型进行了建模。首先，根据报告的全尺寸测试数据对数值模型进行了验证，然后将分析扩展到各种管道尺寸，覆盖层高度和沙子的饱和度。结果表明，峰迁移量可能与当前指南建议的峰迁移量显着不同，并且在很大程度上取决于当前研究中考虑的因素。

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