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Analysis of fluidized zone in transparent soil under jet induced by pipe leakage

Water Science and Engineering 2023年第2期16卷 203-210页

作者： Li-jie Jiang Bin Zhang Sai-hua Huang Yu Shao College of Water Resources and Environmental Engineering Zhejiang University of Water Resources and Electric PowerHangzhou 310018China Key Laboratory for Technology in Rural Water Management of Zhejiang Province Hangzhou 310018China College of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310058China

Jets caused by burst tubes erode the surrounding soil, eventually leading to issues such as ground collapse. It is therefore highly important to study the mechanisms of soil erosion caused by jets after pipeline leakage. To investigate the water-soil interaction mechanisms of pipe leakage, this study used transparent soil and developed a three-dimensional experimental device to observe the fluidization process. Changes in the boundary of the fluidization transition area were investigated, and a formula for calculating the soil damage area was derived. The results showed three different shapes of the Fluidized cavity appearing in the fluidization process. The particles initially moved upward and then gradually transitioned into a state of backflow. The effects of particle size, upper load, and porosity on fluidization were also analyzed. It was found that soil with a large particle size and a lower porosity under a heavy upper load can effectively restrain fluidization. Therefore, large-diameter and dense soil can be used as pipe-covering material.

关键词： Water-soil interaction Fluidized cavity Transparent soil Particle image velocimetry Pipe leakage

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