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间断级配砂土中管线破损引起的渗流侵蚀模型试验
引用本文:张冬梅,杜伟伟,高程鹏.间断级配砂土中管线破损引起的渗流侵蚀模型试验[J].岩土工程学报,2018,40(11):2129-2135.
作者姓名:张冬梅  杜伟伟  高程鹏
作者单位:1. 同济大学岩土及地下工程教育部重点实验室,上海 200092;2. 同济大学地下建筑与工程系,上海 200092
基金项目:国家自然科学基金项目(41772295,51478344); 上海市科委资助项目(16DZ1200403)
摘    要:频发的路面塌陷事故对城市安全造成了巨大威胁,主要原因是地下管线破损引起周围土体的渗流侵蚀,进而产生了地下空洞所致。针对目前常见的地下无压管线破损问题,提出了一种研究间断级配砂土中破损管线周围渗流侵蚀特性的模型试验方法。基于试验中的水土流失变化和受侵蚀区域的发展规律,揭示了间断级配砂土中侵蚀过程可分为快速侵蚀阶段、稳定侵蚀阶段和收敛阶段,土体中由于侵蚀变形产生的松动区和空洞扩展规律与砂土流失变化一致。对比不同工况的侵蚀量和最终侵蚀状态,得到了土体饱和度和水位高度通过影响渗流力而改变侵蚀量和空洞形态,土体级配则决定了可流失细砂含量,从而影响侵蚀量和空洞大小,而当管线破损形状只导致细粒流失时,破损尺寸的增加将增多流失路径数量,进而增大了侵蚀量,但此因素影响较小。

关 键 词:管线渗漏  渗流侵蚀  模型试验  影响因素  间断级配砂土  
收稿时间:2017-09-17

Model tests on seepage erosion caused by pipeline damage in gap-grading sand
ZHANG Dong-mei,DU Wei-wei,GAO Cheng-peng.Model tests on seepage erosion caused by pipeline damage in gap-grading sand[J].Chinese Journal of Geotechnical Engineering,2018,40(11):2129-2135.
Authors:ZHANG Dong-mei  DU Wei-wei  GAO Cheng-peng
Affiliation:1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
Abstract:Road collapses occur frequently, which is a large threat to the city safety. The collapse is initiated by the ground cavity caused by the internal erosion around buried broken pipelines. In view of this problem, a model test method is presented to study the characteristics of the internal erosion due to broken pipelines in gap-grading sand. The process of erosion could be divided into three stages of rapid erosion, steady erosion and convergence stage in terms of the mass of eroded soil. Loose area and cavity are produced due to deformation of eroded soil and expand similarly to the process of erosion. The soil erosion and final erosion states under different conditions are compared, which reveals that the soil saturation and water level can influence the erosion amount and cavity state by affecting the seepage force. Besides, the initial soil grading determines the content of fine sand which can migrate away, affecting the erosion degree and cavity area. Finally, the larger pipe defect causes more migration pathways and increases the soil loss when the defect shape allows the fine particles to migrate into the pipe merely, but it has little influence.
Keywords:pipeline leakage  internal erosion  model test  influential factor  gap-grading sand  
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