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Experimental and numerical study of internal erosion around submerged defective pipe

机译：浸没缺陷管内部腐蚀的实验和数值研究

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摘要

Ground subsidence induced by internal erosion around defective sewer pipes commonly occurs in urban areas of many cities over the world, which has caused substantial socioeconomic loss. Professional pipe design, inspection and maintenance demand a comprehensive understanding of the internal erosion mechanism due to defective pipes. This paper conducts a series of experimental, theoretical and numerical analyses aiming to propose a new method quantifying the erosion process around defective pipes. In this study, a laboratory experimental test of internal erosion was conducted using gap-graded soils, followed by the derivation of a nonlinear incremental governing equation for quantifying the erosion rate of soil on the basis of experimental results. After that, a new type of element was established to incorporate the proposed governing equation of erosion into Mohr-Coulomb constitutive soil model. Finally, this new element was adopted in a 2D soil-fluid coupled finite element analysis of soil erosion due to pipe defect. Results indicate that (1) the hydraulic head greatly affects cavity formation and soil loss, whereas the defect types have a little effect on eroded region, (2) visual images during test show that the soil erosion gradually slows down and eventually stabilizes along with the forming of soil skeleton, (3) the numerical results match well with the experimental results, demonstrating the effectiveness of both the theoretical method and numerical tool for the analysis of soil erosion around defective pipes.
机译：排污管道周围内部侵蚀引起的地面沉降通常发生在世界许多城市的市区，造成了巨大的社会经济损失。专业的管道设计，检查和维护需要对由于管道缺陷造成的内部腐蚀机理有一个全面的了解。本文进行了一系列的实验，理论和数值分析，旨在提出一种量化缺陷管道周围腐蚀过程的新方法。在这项研究中，使用间隙分级土壤进行了内部侵蚀的实验室实验测试，然后根据实验结果推导了非线性增量控制方程，用于量化土壤的侵蚀速率。之后，建立了一种新型元素，将拟议的侵蚀控制方程式纳入Mohr-Coulomb本构模型。最终，该新元素被用于二维水-流耦合有限元分析中，以分析由于管道缺陷引起的土壤侵蚀。结果表明：（1）水力压头对空洞的形成和土壤流失的影响很大，而缺陷类型对侵蚀区域的影响很小；（2）试验期间的视觉图像显示，水土流失逐渐减缓并最终稳定下来。 （3）数值结果与实验结果吻合得很好，证明了理论方法和数值工具对于分析缺陷管道周围土壤侵蚀的有效性。

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