覆盖层及其与砂层接触面特性对堤基管涌影响试验研究  

Experimental Study on Piping Considering Cover Layer and Its Contact Surface with Sand Layer Characteristics

作　　者：刘洪辰 吴庆华[1] 苏怀智[2,3] 王金龙 LIU Hongchen;WU Qinghua;SU Huaizhi;WANG Jinlong(Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Instiute,Wuhan,Hubei 430010,China;College of Water Conserancy and Hydropower Engineering,Hohai Unitersity,Narnjing,Jiangsu 210098,China;State Key Laboratory of Hydrodlogy-Water Resources and Hydraulic Engineering,Nanjing,Jiangsu 210098,China)

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010 [2]河海大学水利水电学院,江苏南京210098 [3]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098

出　　处：《水利与建筑工程学报》2020年第4期165-170,共6页Journal of Water Resources and Architectural Engineering

基　　金：国家重点研发计划项目(2017YFC1502602,2018YFC0407101,2017YFC0404803);中央级公益性科研院所基本科研业务费项目(CKSF2019477/YT,CKSF2019292/SH);国家自然科学基金项目(51979093)。

摘　　要：选取二元堤基为对象,通过设计和执行3种密实度与3种厚度覆盖层以及2种接触面情况下砂槽模型管涌试验,剖析了覆盖层密实度、厚度及其与砂层接触面特性等对管涌发生发展的影响规律。试验结果表明,在二元堤基中,覆盖层密实度越大,临界比降和破坏比降越大,覆盖层抵抗管涌侵蚀的能力越强;覆盖层厚度小,管涌发展速度快,短时间内即会贯通,增加覆盖层厚度可使管涌通道上部不易产生塌陷,但临界比降和破坏比降与厚度没有明显相关性;覆盖层与砂层的接触面存在砂土混合的过渡层时,临界比降和破坏比降均增大,管涌通道不易发展。In this paper,the binary levee foundation was selected as the research object.The influence of compactness,thickness of the cover layer and contact characteristics with the sand layer on the occurrence and development on piping was analyzed by carrying out a series of experiments on three kinds of compactness and thickness covering layers and two types of contact surface.The test results show that in the binary levee foundation,the greater the density of the cover layer,the greater the critical gradient and the damage gradient,the stronger the ability of the cover layer to resist the piping erosion;the thickness of the cover layer is small,the piping development speed is fast,and it will pass through in a short time.Increasing the thickness of the cover layer makes it difficult for the upper part of the piping channel to collapse,but there is no obvious correlation between the critical gradient and the damage gradient and the thickness;when there is a sand mixed transition layer between the cover layer and the sand layer,both the critical gradient and the damage gradient increase,and the piping channel is not easy to develop.

关 键 词：堤基 管涌 覆盖层 接触面 模型试验 

分 类 号：TV223.4[水利工程—水工结构工程]