管漏产生的渗流水受挡水效应后对产生渗蚀的影响

打开文本图片集

中图分类号：TU990.3；TU441；TB115.2 文献标志码：B

Influence of water retaining effect on the erosion caused by pipe leakage

ZHONG Shiying1，2，LIU Wei ，CONG Bori （1.School of Civil Engineering，Shandong Jianzhu University，Jinan 250l01，China；2.KeyLaboratoryof Building Structural Retrofitting and Underground Space Engineering（Ministry of Education），Jinan 2501O1，China； 3.Innovation Research Institue，Shandong High-Speed Group Co.，Ltd.，Jinan 25O1OO，China）

Abstract： In order to study the influence of the flow effct caused by the leakage and erosion of the hydraulic pipeline on the formation of the erosion after being blocked by the underground structure，the process of pipeline leakage and flow through the underground structure is simulated by the discrete element method on the basis of the principle offluid-solid two-way coupling. PFC is used to simulate the flow of seepage water when it comes into contact with underground structures，and Fluid Dynamics Simulation is used to simulate the complete process of flow flow. The results show that the seepage water will circulate when it flows through the underground structure. The circulatory velocity of the seepage water is the largest for the circular structure and the smallst for the rectangular structure，when the seepage water flows through the structure under the same conditions. The blocking effect of the underground structure on the sepage is proportional to the water retaining width of the structure，the water retaining effect of the rectangular structure is the best，and the water retaining effect of the circular structure is the worst.

Key Words： pipelines leakage；circulation； underground structure； blocking efect；erosion； infiltrationline contour

0 引言

给水管网普遍存在漏损问题1，根据《2018 年城市供水统计年鉴》的数据显示，国内各城市的管网漏损总量高达60亿 ，平均漏损率大于14.56% ，其中多数城市的管网漏损率超过 12% 的国家控制标准。（剩余8253字）